Speed

Question 1

equation for average speed

Answer 1

average speed = distance / time

Question 2

Understand why one type of speed camera takes two

photographs:

Answer 2

• a certain time apart
• when the vehicle moves over marked lines a
known distance apart on the road.

Question 3

Understand how average speed cameras work.

Answer 3

• a camera takes a photo of the car number plate
• a second camera takes a photo of the same car later
• the time between the photos and the distance between the cameras is used to work out the average speed

Question 4

Interpret the relationship between speed, distance

and time

Answer 4

• increasing the speed, which increases the
distance travelled in the same time
• increasing the speed reduces the time needed to
cover the same distance.

Question 5

Describe and interpret the gradient (steepness) of a

distance-time graph as speed.

Answer 5

The steeper the slope, the faster the speed.