Figure 7 shows a drone - Edexcel - GCSE Physics - Question 3 - 2020 - Paper 1
Question 3
Figure 7 shows a drone.
The drone has four spinning blades.
The upward force produced enables the drone to rise in the air.
The speed at which the blades spin is ... show full transcript
Worked Solution & Example Answer:Figure 7 shows a drone - Edexcel - GCSE Physics - Question 3 - 2020 - Paper 1
Step 1
Describe the relationship between upward force and speed shown by this graph.
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Answer
The upward force produced by the drone's blades increases with speed. Initially, the relationship is non-linear, showing exponential growth after a certain speed threshold, indicating that as the speed increases, the force produced also rises significantly.
Step 2
Calculate the change in gravitational potential energy when the drone rises through a height of 20 m.
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Answer
The change in gravitational potential energy (GPE) can be calculated using the formula:
extGPE=mimesgimesh
Substituting the values:
extGPE=4.5extkgimes10extN/kgimes20extm=900extJ
Step 3
State the amount of useful work done by the blades as the drone rises through 20 m.
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Answer
The useful work done by the blades as the drone rises through 20 m is 900 J.
Step 4
Calculate the useful power developed by the blades in this time of 4 s.
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Answer
The power developed can be calculated using the formula:
