3.1 Speed

Question 1

Explain how speed measures

Answer 1

Speed measures of how far something travels in a particular time

Question 2

What do we measure speed in in science

Answer 2

Metres per second

Question 3

Maths of calculating speed

Answer 3

speed (m/s)= distance travelled (m)
time taken (s)

Question 4

Work out this equation

A long distance runner runs part of his race at a steady speed. it takes him 20 seconds to run 100m

Answer 4

speed= 100
20s
=5m/s

Question 5

What is meant by instantaneous speed

Answer 5

The speed at a particular moment. For example the speed a marathon runner is running at is instantaneous because they aren’t running at exactly the same speed throughout the race

Question 6

How do we work out the average speed

Answer 6

By dividing the total distance by the total time it took to run the race

Question 7

State an example of relative motion

Answer 7

Have you ever looked out of the window of a stationery train in a station at a moving train and felt that your train is moving?

Question 8

Relative motion definition

Answer 8

the difference between the speed of two moving objects or of a moving and stationer object