Speed, Displacement and Velocity

Question 1

Unit of time

Answer 1

The unit of time is the second (s)

Question 2

Unit of distance

Answer 2

The unit of distance is the metre (m)

Question 3

Speed

Answer 3

Speed is the rate of change of distance with respect to time

Question 4

Unit of speed

Answer 4

The unit of speed is the metre per second (m/s)

Question 5

Displacement

Answer 5

Displacement is distance in a given direction

Question 6

Velocity

Answer 6

Velocity is the rate of change of displacement with respect to time

Question 7

Unit of velocity

Answer 7

The unit of velocity is the metre per second (m/s)

Question 8

Constant velocity

Answer 8

If an object moves in a straight line and does not speed up or slow down it has a constant velocity

Question 9

Average velocity

Answer 9

Average velocity = instantaneous velocity (to a high degree of accuracy) provided the average velocity is measured over a very small time interval or a very small distance

Question 10

Distance-time graphs

Answer 10

A distance-time graph for an object moving with constant velocity is a straight line
The slope of the graph is the speed of the object