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Mechanics Flashcards

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1
Q

When something changes its velocity

A

Accelerate

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2
Q

The rate of change of velocity of a moving object. Can result from a change in speed and/or a change in direction

A

Acceleration

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3
Q

On surface of earth value is 9.8 ms^-2, increases nearer the poles, decreases with altitude and depth inside the earth

A

Acceleration due to gravity

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4
Q

The imaginary line about which a planet or other object rotates

A

Axis

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5
Q

When a number of forces act on a body and the resultant force is zero

A

Balanced Forces

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6
Q

Force required to keep an object moving in a circle

A

Centripetal force

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7
Q

The motion of a body along a circular path

A

Circular Motion

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8
Q

An orbit that is circular

A

Circular orbit

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9
Q

Objects hitting each other

A

Collision

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10
Q

When energy is transformed from one type of energy into another, the total energy before and after are always the same

A

Conservation of Energy

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11
Q

Mass, including single atoms, is neither created nor destroyed in a chemical reaction (Not measurable anyway!)

A

Conservation of mass

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12
Q

The total momentum of a group of a closed system remains constant in the absence of external forces

A

Conservation of momentum

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13
Q

Negative acceleration

A

Deceleration

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14
Q

The change in the position of an object in a particular direction

A

Displacement

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15
Q

The actual length of the path traveled by a body irrespective of the direction is called the distance traveled

A

Distance

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16
Q

Set of formulas used to describe motion mathematically

A

Equations of motion

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17
Q

The force with which two objects attract each other because of their masses

A

Force of gravitation

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18
Q

The motion of a body towards the earth when no other force except weight acts on it

A

Free fall

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19
Q

The force that resists the motion of one surface relative to another with which it is in contact

A

Friction

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20
Q

The Universal Gravitational constant G which appears in the equation for Newton’s law of gravitation

A

Gravitational constant G

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21
Q

Force of attraction between two objects due to their mass

A

Gravity

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22
Q

Impulse

A

Change in momentum caused by an external force

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23
Q

Collision where kinetic energy is not conserved (some energy is converted to sound or heat)

A

Inelastic collision

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24
Q

Inertia

A

The property of matter that causes it to resist any change in its state of rest or of uniform motion

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25
Q

Energy possessed by a body or object by the virtue of its motion

A

Kinetic Energy

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26
Q

Mass

A

The quantity of matter contained in a body or object. It remains the same everywhere

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27
Q

Matter

A

Anything that occupies space and has mass

28
Q

The quantity of motion of a body or object. Measured as a product of its mass and velocity

A

Momentum

29
Q

Motion

A

Manner of how a object or body moves

30
Q

The resulting force after all forces have been added using vectors

A

Net force

31
Q

A unit of force defined as 1 Newton force is needed to accelerate a 1kg mass 1ms^-2

A

Newton

32
Q

A body continues in a state of rest or of uniform motion in a straight line unless it is acted upon by an external force

A

Newton’s first law of motion

33
Q

Force between two particles is proportional to their masses and inversely proportional to the square of the distance between them

A

Newton’s law of gravitation

34
Q

The rate of change of momentum is equal to force OR force acting on a body is equal to the product of its mass and acceleration

A

Newton’s second law of motion

35
Q

To every action there is an equal and opposite reaction. The action and reaction act on two different bodies simultaneously

A

Newton’s third law of motion

36
Q

When the velocity of a body increases by unequal amounts in equal intervals of time

A

Non Uniform Acceleration

37
Q

When a body travels unequal distances in equal intervals of time

A

Non Uniform Speed

38
Q

Covers unequal distances in equal intervals of time in one direction/ Covers equal distances in equal intervals but changes direction

A

Non Uniform Velocity

39
Q

A mass (called “Bob”) tied to a piece of string

A

Pendulum

40
Q

For a particular vibration, the time for one complete oscillation

A

Period

41
Q

Point upon which an object turns or rotates

A

Pivot

42
Q

The energy of a body due to its height or the energy of a body due to its shape

A

Potential Energy

43
Q

An object thrown into the air either horizontally and under the action of gravity

A

Projectile

44
Q

Distance from the centre of a circle to the edge

A

Radius

45
Q

The horizontal distance traveled by a projectile

A

Range

46
Q

The motion of a body in a straight line is called rectilinear motion.

A

Rectilinear Motion

47
Q

Negative acceleration is called retardation. In retardation the velocity of a body decreases with time.

A

Retardation

48
Q

One full circle (2Pie)

A

Revolution

49
Q

The distance traveled by a body or object in one unit of time is called its speed

A

Speed

50
Q

Force required to extend or compress a spring by one meter

A

Spring constant

51
Q

When a body changes its position which respect to a fixed point

A

State of Motion

52
Q

When a body does not change its position which respect to a fixed point

A

State of Rest

53
Q

Velocity in a perpendicular direction to the centripetal force at a given instant

A

Tangential velocity

54
Q

Force in object that opposes them being stretched

A

Tension force

55
Q

The time taken by a projectile from the moment it is thrown until it touches the ground

A

Time of flight

56
Q

Turning force (not applied through the Centre of mass)

A

Torque

57
Q

When a number of forces act on a body or object and the resultant force is not zero

A

Unbalanced forces

58
Q

When the velocity of a body increases by equal amounts in equal intervals of time

A

Uniform Acceleration

59
Q

The motion of an object in a circular path with uniform speed

A

Uniform Circular Motion

60
Q

When a body travels equal distances in equal intervals of time then it is said to have uniform speed

A

Uniform Speed

61
Q

When a body travels along a straight line in particular direction and covers equal distances in equal intervals of time

A

Uniform Velocity

62
Q

Distance traveled by a body or object in a particular direction per unit time

A

Velocity

63
Q

Circular motion where the speed, as well as the direction of the object is constantly changing

A

Vertical circle

64
Q

The force with which a body is attracted towards the center of the earth

A

Weight

65
Q

Apparent loss of weight of a body in free-fall

A

Weightless

66
Q

Work is done when force acting on a body moves it

A

Work

67
Q

The restored force is proportional to the extension up to the limit of proportionality

A

Hooke’s Law

Physics (5 decks)

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