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Physics- Grade 11 > physics exam > Flashcards

physics exam Flashcards

1
Q

What is the definition of physics?

A

Physics is the study of matter, energy, and the interactions between them.

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2
Q

True or False: The SI unit for mass is the kilogram.

A

True

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3
Q

What is the formula for calculating speed?

A

Speed = Distance / Time

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4
Q

Fill in the blank: The standard unit of distance in the SI system is the ___.

A

meter

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5
Q

What is the difference between scalar and vector quantities?

A

Scalar quantities have magnitude only, while vector quantities have both magnitude and direction.

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6
Q

What is the formula for acceleration?

A

Acceleration = Change in Velocity / Time

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7
Q

True or False: Velocity is a scalar quantity.

A

False

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8
Q

What does the slope of a distance-time graph represent?

A

The slope represents speed.

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9
Q

What is the unit of force in the SI system?

A

Newton

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10
Q

Fill in the blank: The force of gravity acting on an object is called its ___.

A

weight

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11
Q

What is Newton’s First Law of Motion?

A

An object at rest stays at rest and an object in motion stays in motion unless acted upon by a net external force.

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12
Q

What is the formula for calculating momentum?

A

Momentum = Mass x Velocity

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13
Q

True or False: The unit of energy is the Joule.

A

True

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14
Q

What is the principle of conservation of energy?

A

Energy cannot be created or destroyed, only transformed from one form to another.

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15
Q

What is kinetic energy?

A

Kinetic energy is the energy of an object due to its motion.

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16
Q

What is the formula for gravitational potential energy?

A

Potential Energy = Mass x Gravity x Height

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17
Q

What is the difference between speed and velocity?

A

Speed is scalar and does not have direction, while velocity is a vector and includes direction.

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18
Q

Fill in the blank: The acceleration due to gravity on Earth is approximately ___.

A

9.81 m/s²

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19
Q

What does a flat line on a velocity-time graph indicate?

A

A flat line indicates constant velocity.

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20
Q

What is the formula for calculating work done?

A

Work = Force x Distance x cos(θ)

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21
Q

True or False: A heavier object falls faster than a lighter object in a vacuum.

A

False

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22
Q

What is the definition of acceleration?

A

Acceleration is the rate of change of velocity over time.

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23
Q

What is the unit of acceleration in the SI system?

A

m/s²

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24
Q

Fill in the blank: The area under a velocity-time graph represents ___.

A

displacement

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25
Q

What is the difference between elastic and inelastic collisions?

A

In elastic collisions, kinetic energy is conserved; in inelastic collisions, it is not.

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26
Q

What is the law of universal gravitation?

A

Every point mass attracts every other point mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

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27
Q

Fill in the blank: The acceleration of an object is directly proportional to the ___.

A

net force acting on it

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28
Q

What is the unit of energy in the SI system?

A

Joule

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29
Q

What does friction do in a motion scenario?

A

Friction opposes the motion of objects.

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30
Q

What is centripetal force?

A

Centripetal force is the net force that acts on an object moving in a circular path, directed towards the center of the circle.

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31
Q

True or False: Work can be done even if there is no movement.

A

False

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32
Q

What is the difference between mass and weight?

A

Mass is the amount of matter in an object, while weight is the force of gravity acting on that mass.

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33
Q

What is the formula for calculating average speed?

A

Average Speed = Total Distance / Total Time

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34
Q

Fill in the blank: The gravitational force between two objects depends on their masses and the ___.

A

distance between them

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35
Q

What does an object’s inertia depend on?

A

Inertia depends on the object’s mass.

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36
Q

What is the definition of a free fall?

A

Free fall is the motion of an object under the influence of gravitational force only.

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37
Q

True or False: Energy can be transformed from one form to another.

A

True

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38
Q

What is the principle of momentum conservation?

A

The total momentum of a closed system remains constant if no external forces act on it.

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39
Q

What is the definition of displacement?

A

Displacement is the vector quantity that represents the change in position of an object.

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40
Q

True or False: Speed is a scalar quantity.

A

True

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41
Q

Fill in the blank: The formula for calculating average velocity is __________.

A

average velocity = total displacement / total time

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42
Q

What is the difference between distance and displacement?

A

Distance is a scalar quantity representing the total path length traveled, while displacement is a vector quantity indicating the shortest path from the initial to the final position.

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43
Q

What is the formula for calculating acceleration?

A

Acceleration = (final velocity - initial velocity) / time

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44
Q

Multiple Choice: Which of the following is NOT a unit of acceleration? A) m/s² B) km/h² C) m/s D) ft/s²

A

C) m/s

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45
Q

What does a negative acceleration indicate?

A

A negative acceleration indicates that an object is slowing down.

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46
Q

True or False: An object can have a constant speed but still be accelerating.

A

True

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47
Q

Fill in the blank: The area under a velocity-time graph represents __________.

A

displacement

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48
Q

What is the significance of the slope of a position-time graph?

A

The slope of a position-time graph represents the velocity of the object.

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49
Q

Multiple Choice: Which of the following equations represents uniformly accelerated motion? A) v = u + at B) v = u + 1/2at² C) s = ut + 1/2at² D) All of the above

A

D) All of the above

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50
Q

Define the term ‘free fall’.

A

Free fall is the motion of an object under the influence of gravitational force only.

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51
Q

What is the acceleration due to gravity on Earth?

A

The acceleration due to gravity on Earth is approximately 9.81 m/s².

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52
Q

True or False: The trajectory of a projectile is always a straight line.

A

False

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53
Q

Fill in the blank: The maximum height of a projectile occurs when its __________ is zero.

A

vertical velocity

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54
Q

What are the two components of projectile motion?

A

The horizontal component and the vertical component.

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55
Q

Multiple Choice: Which factor does NOT affect the range of a projectile? A) Launch angle B) Initial velocity C) Air resistance D) Mass of the projectile

A

D) Mass of the projectile

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56
Q

What is the principle of conservation of momentum?

A

The principle states that the total momentum of a closed system remains constant if no external forces act on it.

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57
Q

True or False: Momentum is a scalar quantity.

A

False

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58
Q

Fill in the blank: The formula for momentum is __________.

A

momentum = mass × velocity

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59
Q

What is an elastic collision?

A

An elastic collision is one in which both momentum and kinetic energy are conserved.

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60
Q

Multiple Choice: In an inelastic collision, which of the following is true? A) Total kinetic energy is conserved B) Total momentum is conserved C) Both A and B D) None of the above

A

B) Total momentum is conserved

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61
Q

What is the role of a force in relation to motion?

A

A force is any interaction that, when unopposed, will change the motion of an object.

62
Q

True or False: A net force of zero indicates that an object is at rest.

A

False

63
Q

Fill in the blank: Newton’s first law states that an object at rest will remain at rest, and an object in motion will remain in motion unless acted upon by a __________.

A

net external force

64
Q

What is the formula for calculating force?

A

Force = mass × acceleration

65
Q
A
66
Q

What is the formula for calculating kinetic energy?

A

Kinetic energy (KE) = 1/2 mv², where m is mass and v is velocity.

67
Q

True or False: Potential energy is the energy an object has due to its position.

A

True

68
Q

Fill in the blank: The law of conservation of energy states that energy cannot be __________ or __________.

A

created, destroyed

69
Q

What unit is used to measure energy?

A

Joule (J)

70
Q

What is the difference between elastic and inelastic collisions?

A

In elastic collisions, kinetic energy is conserved; in inelastic collisions, kinetic energy is not conserved.

71
Q

Multiple Choice: Which of the following is NOT a form of energy? A) Thermal B) Chemical C) Time D) Kinetic

A

C) Time

72
Q

What is the gravitational potential energy formula?

A

Gravitational potential energy (PE) = mgh, where m is mass, g is acceleration due to gravity, and h is height.

73
Q

True or False: Work is defined as the product of force and displacement in the direction of the force.

A

True

74
Q

Fill in the blank: The work done on an object is equal to the change in its __________.

A

energy

75
Q

What is the work-energy principle?

A

The work done on an object is equal to the change in its kinetic energy.

76
Q

Multiple Choice: What is the unit of power? A) Joule B) Watt C) Newton D) Meter

A

B) Watt

77
Q

What does the term ‘power’ refer to in physics?

A

Power refers to the rate at which work is done or energy is transferred.

78
Q

True or False: A machine can create energy.

A

False

79
Q

What is the efficiency of a machine?

A

Efficiency is the ratio of useful work output to total work input, usually expressed as a percentage.

80
Q

Fill in the blank: The formula for calculating efficiency is __________.

A

(Useful work output / Total work input) x 100%

81
Q

What is an example of a non-conservative force?

A

Friction

82
Q

Multiple Choice: Which of the following forms of energy is associated with motion? A) Thermal B) Kinetic C) Potential D) Chemical

A

B) Kinetic

83
Q

What is the principle of conservation of momentum?

A

The total momentum of a closed system remains constant if no external forces act on it.

84
Q

True or False: Momentum is a vector quantity.

A

True

85
Q

Fill in the blank: The formula for momentum is __________.

A

p = mv, where p is momentum, m is mass, and v is velocity.

86
Q

What is the relationship between impulse and momentum?

A

Impulse is equal to the change in momentum of an object.

87
Q

Multiple Choice: Which of the following is an example of a scalar quantity? A) Velocity B) Force C) Speed D) Acceleration

A

C) Speed

88
Q

What is the definition of work in physics?

A

Work is done when a force causes displacement in the direction of the force.

89
Q

True or False: The net work done on an object is equal to the object’s change in kinetic energy.

A

True

90
Q

Fill in the blank: The unit of work is __________.

A

Joule (J)

91
Q

What is the formula for calculating gravitational potential energy?

A

PE = mgh

92
Q

Multiple Choice: Which of the following does NOT affect the gravitational potential energy of an object? A) Mass B) Height C) Speed D) Gravity

A

C) Speed

93
Q

What is the effect of increasing the height of an object on its potential energy?

A

Increasing the height increases the gravitational potential energy.

94
Q

True or False: In a vacuum, all objects fall at the same rate regardless of mass.

A

True

95
Q

Fill in the blank: The acceleration due to gravity on Earth is approximately __________.

A

9.81 m/s²

96
Q

What is the definition of a conservative force?

A

A conservative force is one where the work done is independent of the path taken and only depends on the initial and final positions.

97
Q

Multiple Choice: An example of a conservative force is: A) Friction B) Tension C) Gravitational force D) Air resistance

A

C) Gravitational force

98
Q

What is the relationship between energy and work?

A

Energy is the capacity to do work, and work is done when energy is transferred.

99
Q

True or False: An object at rest has kinetic energy.

A

False

100
Q

Fill in the blank: The total mechanical energy of an object is the sum of its __________ and __________ energy.

A

kinetic, potential

101
Q

What is the formula for calculating power?

A

Power = Work / Time

102
Q

Multiple Choice: In a perfectly elastic collision, which of the following is conserved? A) Kinetic Energy B) Momentum C) Both A and B D) Neither A nor B

A

C) Both A and B

103
Q

What does it mean for a collision to be inelastic?

A

In an inelastic collision, kinetic energy is not conserved, but momentum is.

104
Q

True or False: The work-energy theorem relates work and kinetic energy.

A

True

105
Q

Fill in the blank: The principle of work-energy states that the work done on an object is equal to the __________ in kinetic energy.

A

change

106
Q

What is a common unit for measuring power in the International System of Units (SI)?

A

Watt (W)

107
Q

Multiple Choice: Which of the following statements is true regarding energy? A) Energy can be created B) Energy can be destroyed C) Energy can change forms D) None of the above

A

C) Energy can change forms

108
Q

What type of energy is stored in a compressed spring?

A

Elastic potential energy

109
Q

True or False: A system with higher efficiency does less useful work.

A

False

110
Q

Fill in the blank: The mechanical energy of a system is conserved when only __________ forces are acting.

A

conservative

111
Q

What is the significance of the area under a force vs. displacement graph?

A

The area under the graph represents the work done on the object.

112
Q

Multiple Choice: Which of the following quantities has both magnitude and direction? A) Work B) Energy C) Force D) Power

A

C) Force

113
Q

What happens to the potential energy of an object as it is lifted higher in a gravitational field?

A

The potential energy increases.

114
Q

True or False: The conservation of energy principle applies to all types of energy transformations.

A

True

115
Q

Fill in the blank: The formula for calculating impulse is __________.

A

Impulse = Force x Time

116
Q

What is the result of a collision between two objects with equal mass and equal but opposite velocities?

A

They will come to rest if the collision is perfectly elastic.

117
Q

Multiple Choice: Which of the following best describes thermal energy? A) Energy due to motion B) Energy stored in chemical bonds C) Energy due to temperature D) Energy due to position

A

C) Energy due to temperature

118
Q

What is the relationship between temperature and thermal energy?

A

As temperature increases, thermal energy increases.

119
Q

True or False: All forms of energy can be converted into thermal energy.

A

True

120
Q

Fill in the blank: The conservation of momentum applies to __________ systems.

A

closed

121
Q

What is the effect of doubling the mass of an object on its kinetic energy if its velocity remains constant?

A

The kinetic energy will double.

122
Q

Multiple Choice: Which of the following is an example of an energy transformation? A) A car accelerating B) A light bulb glowing C) A battery powering a device D) All of the above

A

D) All of the above

123
Q

What is the potential energy of an object at a height of 10 m with a mass of 2 kg?

A

PE = mgh = 2 kg x 9.81 m/s² x 10 m = 196.2 J

124
Q

True or False: The energy of a system can change without external work being done.

A

True

125
Q

Fill in the blank: The total energy of an isolated system remains __________.

A

constant

126
Q

What is the purpose of a machine?

A

A machine is used to make work easier by changing the magnitude or direction of a force.

127
Q

Multiple Choice: Which type of energy is associated with the motion of particles in a substance? A) Kinetic B) Potential C) Mechanical D) Nuclear

A

A) Kinetic

128
Q

What is the principle of conservation of momentum?

A

The total momentum of a closed system remains constant if no external forces act on it.

129
Q

True or False: Inelastic collisions conserve kinetic energy.

A

False

130
Q

Fill in the blank: The formula for momentum is _____ = mass × velocity.

A

p

131
Q

What is impulse?

A

Impulse is the change in momentum, calculated as the product of force and the time duration over which it acts.

132
Q

Multiple Choice: Which of the following is a scalar quantity? A) Force B) Velocity C) Mass D) Acceleration

A

C) Mass

133
Q

What is the equation for calculating kinetic energy?

A

KE = 1/2 mv²

134
Q

True or False: The work done on an object is equal to the change in its kinetic energy.

A

True

135
Q

Fill in the blank: The law of conservation of energy states that energy cannot be _____ or destroyed, only transformed.

A

created

136
Q

What is the unit of work in the International System of Units (SI)?

A

Joule (J)

137
Q

Multiple Choice: Which type of collision conserves both momentum and kinetic energy? A) Elastic B) Inelastic C) Perfectly inelastic D) All of the above

A

A) Elastic

138
Q

What does the term ‘power’ refer to in physics?

A

Power is the rate at which work is done or energy is transferred.

139
Q

True or False: Power is measured in watts.

A

True

140
Q

Fill in the blank: The formula for power is _____ = work/time.

A

P

141
Q

What is a projectile?

A

A projectile is an object that is thrown into the air with an initial velocity and is subject to the force of gravity.

142
Q

Multiple Choice: Which of the following factors does not affect the range of a projectile? A) Launch angle B) Initial velocity C) Mass of the projectile D) Height of launch

A

C) Mass of the projectile

143
Q

What is the horizontal component of a projectile’s velocity?

A

It remains constant throughout the motion.

144
Q

True or False: The vertical motion of a projectile is influenced by gravity.

A

True

145
Q

Fill in the blank: The maximum height of a projectile occurs at _____ degrees.

A

90

146
Q

What is the formula for calculating the range of a projectile launched at an angle?

A

Range = (v² * sin(2θ)) / g

147
Q

Multiple Choice: The acceleration due to gravity is approximately: A) 9.8 m/s² B) 10 m/s² C) 8.5 m/s² D) 11.2 m/s²

A

A) 9.8 m/s²

148
Q

What is the difference between elastic and inelastic collisions?

A

Elastic collisions conserve both momentum and kinetic energy, while inelastic collisions conserve momentum but not kinetic energy.

149
Q

True or False: In a perfectly inelastic collision, the colliding objects stick together after the collision.

A

True

150
Q

Fill in the blank: The center of mass of an object is the point at which its mass can be considered to be _____ concentrated.

A

conveniently

151
Q

What does it mean for a system to be in equilibrium?

A

A system is in equilibrium when the net force and net torque acting on it are both zero.

152
Q

Multiple Choice: What type of energy does a compressed spring store? A) Kinetic energy B) Potential energy C) Thermal energy D) Chemical energy

A

B) Potential energy

Physics- Grade 11 (2 decks)

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