Figure 21 shows a pulley system that enables a person to lift a heavy barrel - Edexcel - GCSE Physics - Question 9 - 2023 - Paper 2
Question 9
Figure 21 shows a pulley system that enables a person to lift a heavy barrel.
The person pulls down on the rope to make the barrel rise through 1.2 m.
The work done... show full transcript
Worked Solution & Example Answer:Figure 21 shows a pulley system that enables a person to lift a heavy barrel - Edexcel - GCSE Physics - Question 9 - 2023 - Paper 2
Step 1
Calculate the weight of the barrel.
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Answer
To find the weight of the barrel, we can use the formula for work done, which is given by:
extworkdone=extforceimesextdistance
Here, the work done against gravity is 1800 J and the distance the barrel is raised is 1.2 m.
Rearranging the equation for force gives:
Therefore, the total work done by the person is approximately 2812.5 J.
Step 3
Suggest another reason why some energy is wasted in using this pulley system.
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Answer
Another reason energy is wasted in the pulley system could be due to the tension in the rope or the presence of additional masses in the system.
For example, the bottom pulley and rope may have their own mass, contributing to energy losses in the form of stretching or resistance.
