GCSE Questions: Forces

Q15. The diagram shows an athlete on starting blocks waiting to start a 100 metre race.

(a) Complete the following sentence.

The force from the athlete pushing backwards on the starting blocks is equal to the force from the starting blocks pushing forwards on the athlete.

Choose the answer from the box:

equal to

greater than

less than

[1 mark]

Here is a distance-time graph for the athlete from the moment the race starts.

Three parts of the distance-time graph are labelled J, K and L.

X represents 'not applicable'

Choose a letter relating to the athlete:

(i) not moving X

(ii) moving at constant speed K

(iii) decreasing speed L

(iv) increasing speed J

[2 marks]

(b) What distance does the athlete travel after the end of the race before stopping?

125 - 100 = 25 m

[1 mark]

time = 12.6 s

average speed = 100/12.6

average speed = 7.93 m/s

[3 marks]

(d) The athlete runs faster than a typical person. Tick the box that gives the average running speed of a typical person in metres per second.

[1 mark]

[8 Marks TOTAL]