Linear Motion Keywords

Question 1

Scalar Quantities

Answer 1

Quantities that just have size

Question 2

Vector quantities

Answer 2

Quantities that have size and direction

Question 3

Mass

Answer 3

The quantity of matter the body possesses

Question 4

Weight

Answer 4

The gravitational force exerted on an object

Question 5

Distance

Answer 5

Measured in metres and is the path a body takes as it moves from the starting to the finishing position

Question 6

Displacement

Answer 6

Measured in metres and is the shortest route in a straight line between the starting and finishing position

Question 7

Speed

Answer 7

A measurement in metres/second of the body’s movement per unit of time with no reference to direction

Question 8

Velocity

Answer 8

Measured in metres/second and is the rate of change of displacement

Question 9

Acceleration

Answer 9

Measured in m/s^2 and is the rate of change of velocity

Question 10

Momentum

Answer 10

Momentum (kgm/s) = Mass (kg) x velocity (m/s)

Question 11

External force

Answer 11

Comes from outside

Question 12

Internal force

Answer 12

Is generated by the skeletal muscles

Question 13

Weight

Answer 13

Weight = mass x acceleration due to gravity

Measured in Newtons (N)

Question 14

Reaction force

Answer 14

Occurs when two bodies are in contact with one another

Question 15

Friction

Answer 15

Occurs when two or more bodies are in contact with one another

Question 16

Air resistance

Answer 16

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

Question 17

Impulse

Answer 17

Impulse = force x time

Question 18

Net impulse

Answer 18

A combination of positive and negative impulses