Figure 11 shows a skier using a drag lift - AQA - GCSE Physics - Question 7 - 2018 - Paper 1
Question 7
Figure 11 shows a skier using a drag lift.
The drag lift pulls the skier from the bottom to the top of a ski slope.
The arrows, A, B, C, and D represent the forces... show full transcript
Worked Solution & Example Answer:Figure 11 shows a skier using a drag lift - AQA - GCSE Physics - Question 7 - 2018 - Paper 1
Step 1
Which arrow represents the normal contact force?
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Answer
The normal contact force is represented by arrow C, as it acts perpendicular to the surface and supports the skier's weight.
Step 2
Use the following equation to calculate the work done to pull the skier up the slope.
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Answer
To calculate the work done, we use the formula:
extWorkdone=extForceimesextDistance
Substituting the given values:
extWorkdone=300extNimes45extm=13500extJ
Thus, the work done = 13500 J.
Step 3
Draw a line on Figure 13 to show the change in velocity of the skier as she slows down and comes to a stop.
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Answer
The line should start from the velocity the skier was at 50 seconds, which is likely around 12 m/s, and then drop to 0 m/s over a period of 15 seconds, indicating a constant deceleration.
