Forces and motion

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Question 21
Medium

Solid Wall Push-off and Swimming Race

Figure 1 shows a swimmer pushing off a solid wall to start a 50-metre swimming race.

a.

Complete the sentence by choosing from: equal to, greater than, less than.

The force from the swimmer pushing backwards on the starting wall is _________________ the force from the starting wall pushing forwards on the swimmer.

[1]
b.

Figure 2 shows a distance-time graph for the swimmer from the moment the race starts.

A distance-time graph for a swimmer. The vertical axis represents distance in metres and ranges from 0 to 60 with grid lines every 1 unit and major labels every 10 units. The horizontal axis represents time in seconds and ranges from 0 to 30 with grid lines every 1 unit and major labels every 5 units. The graph shows a single continuous curve starting at (0, 0). Section P, from 0 to 5 seconds, is a curve curving upwards with an increasing gradient, ending at (5, 10). Section Q, from 5 to 25 seconds, is a straight line of constant gradient that passes through (15, 30) and ends at (25, 50). Section R, from 25 to 30 seconds, curves downwards, flattening out to a horizontal line at (30, 56).

Three parts of the distance-time graph are labelled P, Q, and R. Draw one line from each of the labels to the correct description of the swimmer's motion:

  • P
  • Q
  • R

Descriptions: not moving, constant speed, decreasing speed, increasing speed.

[3]
c.

What distance does the swimmer travel after the finish line of the 50-metre race before coming to a stop?

[2]
d.

Calculate the average speed of the swimmer between the start and finish of the 50-metre race. Use the equation: average speed=distance travelledtime taken\text{average speed} = \frac{\text{distance travelled}}{\text{time taken}}average speed=time takendistance travelled​

[2]
e.

What is the average walking speed of a typical person in metres per second? Choose one box:

  • 1.5
  • 3.0
  • 4.5
  • 6.0
[1]

Forces and motion Questions

  1. GCSE
  2. /Physics
  3. /Forces and motion