Equations, Units and Definitions

Question 1

Scalar quantity definition:

Answer 1

Quantities the have only size.

Question 2

Mass units:

Answer 2

Kilograms, (kg).

Question 3

Air resistance definition:

Answer 3

A force that acts in the opposite direction to the motion of the body travelling through air.

Question 4

Weight definition:

Answer 4

The gravitational force exherted on an object.

Question 5

Impulse definition:

Answer 5

The time it takes for a force to be applied to an object or body.

Question 6

External force definition:

Answer 6

Force from the outside of the body, e.g. friction or air resistance.

Question 7

Reaction force definition:

Answer 7

Occurs when two bodies are in contact with one another.

Question 8

Mass definition:

Answer 8

The quantity of matter the body possesses.

Question 9

Torque definition:

Answer 9

The rotational consequence of a force.

Question 10

Angular motion definition:

Answer 10

Movement around a fixed point.

Question 11

Distance definition:

Answer 11

The path a body takes as it moves from start to the finishing positions.

Question 12

Angular velocity definition:

Answer 12

The rate of change of angular displacement (or the rate of rotation).

Question 13

Displacement definition:

Answer 13

The shortest straight-line route between start and finish positions.

Question 14

Vector quantity definition:

Answer 14

Quantities that have size and direction.

Question 15

Acceleration definition:

Answer 15

The rate of change of velocity.

Question 16

Momentum definition:

Answer 16

Product of the mass and velocity of an object.

Question 17

Deceleration definition:

Answer 17

The rate of change of velocity.

Question 18

Angular acceleration definition:

Answer 18

The rate of change of angular velocity.

Question 19

Speed definition:

Answer 19

The body’s movement per unit of time with no reference to distance.

Question 20

Moment of inertia definition:

Answer 20

The resistance of a body to change its state of angular motion or rotation.

Question 21

Force definition:

Answer 21

A push or pull that alters the state of motion of a body.

Question 22

Internal force definition:

Answer 22

Is generated by skeletal muscles.

Question 23

Angular momentum definition:

Answer 23

The quantity of angular motion possessed by a body.

Question 24

Velocity definition:

Answer 24

The rate of change of displacement.

Question 25

Angular displacement:

Answer 25

The smallest change in angle between the start and finish points of rotation.

Question 26

Weight units:

Answer 26

Newtons, (N).

Question 27

Distance units:

Answer 27

Metres, (m).

Question 28

Displacement units:

Answer 28

Metres, (m).

Question 29

Speed units:

Answer 29

Metres per second, (m/s).

Question 30

Velocity units:

Answer 30

Metres per second, (m/s).

Question 31

Acceleration units:

Answer 31

Metres per second squared, (m/s^2).

Question 32

Force units:

Answer 32

Newtons, (N).

Question 33

Impulse units:

Answer 33

Newton seconds.

Question 34

Angular displacement units:

Answer 34

Degrees and Radians, (1 radian = 57.3 degrees).

Question 35

Angular velocity units:

Answer 35

Radians per second, (rad/s).

Question 36

Deceleration units:

Answer 36

Metres per second squared, (m/s^2).

Question 37

Momentum units:

Answer 37

Kilogram-meters per second, (kgm/s).

Question 38

Angular acceleration units:

Answer 38

Radians per second squared, (rad/s^2).

Question 39

Angular momentum units:

Answer 39

Kilogram metres squared radians per second, (kgm^2rad/s).

Question 40

Weight equation:

Answer 40

Weight = mass x gravitational force

Question 41

Speed equation:

Answer 41

Speed = distance covered / time taken

Question 42

Velocity equation:

Answer 42

Velocity = displacement / time taken

Question 43

Acceleration equation:

Answer 43

Acceleration = change in velocity / time taken

Question 44

Force equation:

Answer 44

Force = mass x acceleration

Question 45

Impulse equation:

Answer 45

Impulse = force x time

Question 46

Deceleration equation:

Answer 46

Deceleration = change in velocity / time taken

Question 47

Momentum equation:

Answer 47

Momentum = mass x velocity

Question 48

Angular velocity equation:

Answer 48

Angular velocity = angular displacement / time taken

Question 49

Angular acceleration equation:

Answer 49

Angular acceleration = change in angular velocity / time taken

Question 50

Angular momentum equation:

Answer 50

Angular momentum = moment of inertia x angular velocity.

Question 51

Moment of inertia equation:

Answer 51

Moment of inertia = sum of (mass x distribution of mass from the axis fo rotation)