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Which of these is a vector? A distance B force C mass D work done Calculate the value of W, the weight of child Q - Edexcel - GCSE Physics - Question 7 - 2023 - Paper 2
Question 7
Which of these is a vector? A distance B force C mass D work done Calculate the value of W, the weight of child Q. Use the idea of moments and the equation the mo... show full transcript
Worked Solution & Example Answer:Which of these is a vector? A distance B force C mass D work done Calculate the value of W, the weight of child Q - Edexcel - GCSE Physics - Question 7 - 2023 - Paper 2
Step 1
Step 2
Calculate the value of W, the weight of child Q.
Answer
To find W, we can use the principle of moments, which states that the moments about a pivot must be balanced. Assuming moments are calculated about a pivot point, we can express this as:
Using the distance from the pivot and the weights provided, we can substitute these values and solve for W. Make sure to calculate the final answer to 2 significant figures.
Step 3
Explain how the crowbar enables a person to lift a heavy weight.
Answer
The crowbar acts as a lever, making lifting easier by increasing the distance from the pivot to the point of applied force. This allows a smaller force to create a larger moment, as described by the formula:
This means that less effort is required to lift the heavy weight when using the crowbar. Additionally, the crowbar allows for distributions of the applied force over a larger distance, reducing the effort needed to overcome the load's weight.