9 (a) Figure 23 shows a drone - Edexcel - GCSE Physics - Question 9 - 2020 - Paper 1
Question 9
9 (a) Figure 23 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 s... show full transcript
Worked Solution & Example Answer:9 (a) Figure 23 shows a drone - Edexcel - GCSE Physics - Question 9 - 2020 - Paper 1
Step 1
Describe the relationship between upward force and speed shown by this graph.
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Answer
The graph indicates that the upward force increases as the speed of the drone's blades increases. It is observed that the relationship is non-linear, indicating that at lower speeds (below 1000 turns per minute), there is minimal upward force, but as the speed increases, the upward force rises more 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:
GPE=m⋅g⋅h
Substituting the values:
GPE=4.5kg⋅10N/kg⋅20m=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
Power can be calculated using the formula:
Power=TimeWorkdone
Substituting the values:
Power=4exts900extJ=225extW
Step 5
Describe the changes in the way energy is stored when the drone rises from the ground.
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Answer
As the drone rises from the ground, kinetic energy is converted into gravitational potential energy. Initially, the energy is primarily in the form of chemical energy in the drone's battery. As the drone starts its ascent, this chemical energy is transformed into kinetic energy as the blades spin, allowing the drone to gain speed. Once the drone gains altitude, this kinetic energy is converted into gravitational potential energy, as it performs work against the force of gravity. The energy transfer shows a shift from one form to another, signifying the transformation and storage of energy in different forms during its flight.
