Mechanics

Question 1

When something changes its velocity

Answer 1

Accelerate

Question 2

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

Answer 2

Acceleration

Question 3

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

Answer 3

Acceleration due to gravity

Question 4

The imaginary line about which a planet or other object rotates

Answer 4

Axis

Question 5

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

Answer 5

Balanced Forces

Question 6

Force required to keep an object moving in a circle

Answer 6

Centripetal force

Question 7

The motion of a body along a circular path

Answer 7

Circular Motion

Question 8

An orbit that is circular

Answer 8

Circular orbit

Question 9

Objects hitting each other

Answer 9

Collision

Question 10

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

Answer 10

Conservation of Energy

Question 11

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

Answer 11

Conservation of mass

Question 12

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

Answer 12

Conservation of momentum

Question 13

Negative acceleration

Answer 13

Deceleration

Question 14

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

Answer 14

Displacement

Question 15

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

Answer 15

Distance

Question 16

Set of formulas used to describe motion mathematically

Answer 16

Equations of motion

Question 17

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

Answer 17

Force of gravitation

Question 18

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

Answer 18

Free fall

Question 19

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

Answer 19

Friction

Question 20

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

Answer 20

Gravitational constant G

Question 21

Force of attraction between two objects due to their mass

Answer 21

Gravity

Question 22

Impulse

Answer 22

Change in momentum caused by an external force

Question 23

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

Answer 23

Inelastic collision

Question 24

Inertia

Answer 24

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

Question 25

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

Answer 25

Kinetic Energy

Question 26

Mass

Answer 26

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

Question 27

Matter

Answer 27

Anything that occupies space and has mass

Question 28

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

Answer 28

Momentum

Question 29

Motion

Answer 29

Manner of how a object or body moves

Question 30

The resulting force after all forces have been added using vectors

Answer 30

Net force

Question 31

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

Answer 31

Newton

Question 32

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

Answer 32

Newton’s first law of motion

Question 33

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

Answer 33

Newton’s law of gravitation

Question 34

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

Answer 34

Newton’s second law of motion

Question 35

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

Answer 35

Newton’s third law of motion

Question 36

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

Answer 36

Non Uniform Acceleration

Question 37

When a body travels unequal distances in equal intervals of time

Answer 37

Non Uniform Speed

Question 38

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

Answer 38

Non Uniform Velocity

Question 39

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

Answer 39

Pendulum

Question 40

For a particular vibration, the time for one complete oscillation

Answer 40

Period

Question 41

Point upon which an object turns or rotates

Answer 41

Pivot

Question 42

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

Answer 42

Potential Energy

Question 43

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

Answer 43

Projectile

Question 44

Distance from the centre of a circle to the edge

Answer 44

Radius

Question 45

The horizontal distance traveled by a projectile

Answer 45

Range

Question 46

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

Answer 46

Rectilinear Motion

Question 47

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

Answer 47

Retardation

Question 48

One full circle (2Pie)

Answer 48

Revolution

Question 49

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

Answer 49

Speed

Question 50

Force required to extend or compress a spring by one meter

Answer 50

Spring constant

Question 51

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

Answer 51

State of Motion

Question 52

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

Answer 52

State of Rest

Question 53

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

Answer 53

Tangential velocity

Question 54

Force in object that opposes them being stretched

Answer 54

Tension force

Question 55

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

Answer 55

Time of flight

Question 56

Turning force (not applied through the Centre of mass)

Answer 56

Torque

Question 57

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

Answer 57

Unbalanced forces

Question 58

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

Answer 58

Uniform Acceleration

Question 59

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

Answer 59

Uniform Circular Motion

Question 60

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

Answer 60

Uniform Speed

Question 61

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

Answer 61

Uniform Velocity

Question 62

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

Answer 62

Velocity

Question 63

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

Answer 63

Vertical circle

Question 64

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

Answer 64

Weight

Question 65

Apparent loss of weight of a body in free-fall

Answer 65

Weightless

Question 66

Work is done when force acting on a body moves it

Answer 66

Work

Question 67

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

Answer 67

Hooke’s Law