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

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:

$ext{Moment of } W = ext{Moment of child P}$

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.

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:

$ext{Moment} = ext{Force} imes ext{Distance}$

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.