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7 (a) Two cyclists ride on a hilly road and go through points P, Q, R and S - Edexcel - GCSE Physics - Question 7 - 2021 - Paper 1
Question 7
7 (a) Two cyclists ride on a hilly road and go through points P, Q, R and S. The diagram in Figure 16 shows how the vertical height of the road changes during the ... show full transcript
Worked Solution & Example Answer:7 (a) Two cyclists ride on a hilly road and go through points P, Q, R and S - Edexcel - GCSE Physics - Question 7 - 2021 - Paper 1
Step 1
The greatest overall change in gravitational potential energy for each cyclist is between which two points on the journey?
Answer
The correct answer is A P and Q.
This is because the height difference from point P to Q represents the maximum ascent, thus resulting in the greatest change in gravitational potential energy.
Step 2
Calculate the total amount of work done against gravity when the cyclist travels from point P to point Q in the journey.
Answer
To calculate the work done against gravity, we use the formula:
Here, the weight (F) is 700N and the height difference from P to Q is 20m (from the given height in Figure 16).
Thus:
Therefore, the total amount of work done against gravity is 14000 J.