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Class XI > Newton's Laws Of Motion Physics > Flashcards

Newton's Laws Of Motion Physics Flashcards

1
Q

What is the definition of force?

A

A force is a push or pull acting upon an object as a result of its interaction with another object.

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2
Q

What is the SI unit of force?

A

The SI unit of force is the Newton (N).

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3
Q

True or False: Force can only act on an object that is in motion.

A

False

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4
Q

Fill in the blank: Force is a vector quantity, which means it has both __________ and __________.

A

magnitude, direction

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5
Q

What law states that the acceleration of an object is directly proportional to the net force acting on it?

A

Newton’s Second Law of Motion

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6
Q

What is the formula for calculating force?

A

Force (F) = mass (m) × acceleration (a)

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7
Q

What is inertia?

A

Inertia is the tendency of an object to resist changes in its state of motion.

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8
Q

True or False: A force can change the shape of an object.

A

True

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9
Q

What type of forces are gravity and friction categorized as?

A

Non-contact forces and contact forces, respectively.

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10
Q

What is the net force?

A

The net force is the vector sum of all the forces acting on an object.

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11
Q

Fill in the blank: The force of gravity acting on an object is known as its __________.

A

weight

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12
Q

What is the principle of superposition of forces?

A

The principle states that the total force acting on a body is the vector sum of all individual forces acting on it.

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13
Q

True or False: Forces can only be exerted by physical contact.

A

False

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14
Q

What is a contact force?

A

A contact force is a force that acts on an object through direct physical contact.

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15
Q

What is a non-contact force?

A

A non-contact force is a force that acts on an object without physical contact, such as gravitational or electromagnetic forces.

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16
Q

What does it mean for forces to be balanced?

A

Balanced forces are equal in size and opposite in direction, resulting in no change in motion.

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17
Q

What is friction?

A

Friction is a force that opposes the relative motion or tendency of such motion of two surfaces in contact.

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18
Q

Fill in the blank: The force that pulls objects toward the center of the Earth is called __________.

A

gravity

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19
Q

What is the difference between static and kinetic friction?

A

Static friction acts on an object at rest, while kinetic friction acts on an object in motion.

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20
Q

What is the formula for weight?

A

Weight (W) = mass (m) × gravitational acceleration (g)

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21
Q

True or False: An object can have a net force of zero and still be moving.

A

True

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22
Q

What is the effect of an unbalanced force on an object?

A

An unbalanced force causes an object to accelerate in the direction of the net force.

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23
Q

What does Newton’s First Law of Motion state?

A

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

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24
Q

What is an example of a non-contact force?

25
Q

What is the relationship between mass and weight?

A

Weight is the force of gravity acting on an object’s mass.

26
Q

What is Newton’s Third Law of Motion?

A

For every action, there is an equal and opposite reaction.

27
Q

True or False: According to Newton’s Third Law, forces act in isolation.

28
Q

Fill in the blank: If object A exerts a force on object B, then object B exerts a ______ force on object A.

A

equal and opposite

29
Q

What is the relationship between action and reaction forces?

A

They are equal in magnitude and opposite in direction.

30
Q

Multiple Choice: Which of the following is an example of Newton’s Third Law? A) A rocket taking off B) A car accelerating C) A ball being thrown D) A swimmer pushing against the wall

A

D) A swimmer pushing against the wall

31
Q

What happens to the forces when two objects collide?

A

They exert equal and opposite forces on each other.

32
Q

True or False: The action and reaction forces act on the same object.

33
Q

What is meant by ‘action-reaction pair’?

A

A pair of forces acting on two different objects that are equal in size and opposite in direction.

34
Q

Fill in the blank: Newton’s Third Law applies to ______ interactions.

35
Q

Multiple Choice: Which scenario does NOT illustrate Newton’s Third Law? A) Walking B) Jumping off a diving board C) A book resting on a table D) A balloon deflating

A

C) A book resting on a table

36
Q

What is an everyday example of Newton’s Third Law of Motion?

A

When you push against a wall, the wall pushes back with an equal force.

37
Q

True or False: The reaction force occurs after the action force.

38
Q

What does the Third Law imply about the conservation of momentum?

A

It implies that momentum is conserved in interactions between objects.

39
Q

Fill in the blank: The forces of action and reaction are always exerted on ______ objects.

40
Q

Multiple Choice: Which of the following is a direct application of Newton’s Third Law? A) A car’s engine B) A parachute C) A rocket propulsion D) A bicycle brake

A

C) A rocket propulsion

41
Q

What is the significance of the Third Law in sports?

A

It helps explain how athletes use force to propel themselves or objects.

42
Q

True or False: Newton’s Third Law is only applicable in mechanical systems.

43
Q

What would happen if action and reaction forces were not equal?

A

The motion of the objects would be unbalanced, leading to acceleration.

44
Q

Fill in the blank: The action force is the force that one object exerts on another, while the ______ force is the response from the second object.

45
Q

What does Newton’s Third Law tell us about forces in a vacuum?

A

The law still applies; action and reaction forces occur regardless of the medium.

46
Q

Multiple Choice: Which action demonstrates Newton’s Third Law? A) A person pulling a suitcase B) A ball rolling downhill C) A car reversing D) A child on a swing

A

A) A person pulling a suitcase

47
Q

What is the formula for calculating force as per Newton’s laws?

A

F = ma (Force equals mass times acceleration).

48
Q

True or False: The force exerted by an object depends on its mass and acceleration.

49
Q

Fill in the blank: In a collision, momentum is transferred from one object to ______.

50
Q

What is the definition of tension force?

A

Tension force is the pulling force transmitted along a rope, string, or cable when it is pulled tight by forces acting from opposite ends.

51
Q

True or False: Tension force can only act in one direction.

52
Q

Fill in the blank: Tension force is a type of __________ force.

53
Q

In a system where a mass is hanging from a rope, what is the relationship between the tension in the rope and the weight of the mass?

A

The tension in the rope is equal to the weight of the mass when the system is in equilibrium.

54
Q

Multiple Choice: Which of the following factors does NOT affect the tension in a rope? A) Mass of the object, B) Angle of the rope, C) Length of the rope, D) Acceleration due to gravity

A

C) Length of the rope

55
Q

What happens to the tension in a rope when the object it supports accelerates upward?

A

The tension in the rope increases above the weight of the object.

56
Q

True or False: Tension force can exist in a rope that is not moving.

57
Q

Define the term ‘net force’ in the context of tension.

A

Net force is the overall force acting on an object, which is the vector sum of all individual forces, including tension.

58
Q

Multiple Choice: When two objects are connected by a rope and one is pulling the other, which object experiences greater tension? A) The pulling object, B) The object being pulled, C) Both experience the same tension, D) Tension is not present.

A

C) Both experience the same tension

59
Q

What is the effect of friction on tension in a system where tension is applied?

A

Friction can reduce the effective tension experienced by the object being pulled or supported.

Class XI (2 decks)

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