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 acting on the skier is represented by arrow C. This force acts perpendicular to the surface of the slope.
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
Given that the force is 300 N and the distance is 45 m:
extWorkdone=300extNimes45extm=13500extJ
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
To represent the change in velocity on Figure 13, draw a line that begins at the velocity value just after 50 seconds and slopes downwards to reach 0 m/s after 15 seconds. The line should be linear, indicating a constant deceleration.
