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AQA GCSE · Question 09.3 · Forces
The child pushed the baby walker 2.8 m across a horizontal floor. The work done by the child was 35 J.
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Calculate the horizontal force the child applied to the baby walker.
The child pushed the baby walker 2.8 m across a horizontal floor. The work done by the child was 35 J.
<br><br>
Calculate the horizontal force the child applied to the baby walker.
How to approach this question
1. Start with the equation W = Fs.
2. Rearrange the equation to make the force (F) the subject.
3. Identify the values for work done (W) and distance (s) from the question.
4. Substitute the values and calculate the result. Include the correct units.
Full Answer
From the previous question, the equation is W = Fs.
We need to calculate the force, F. So we must rearrange the equation:
F = W / s
The question gives the values:
Work done (W) = 35 J
Distance (s) = 2.8 m
Substitute these values into the rearranged equation:
F = 35 / 2.8
F = 12.5 N
The unit for force is Newtons (N).
Common mistakes
✗ Failing to rearrange the equation correctly.\n✗ Dividing distance by work done (s/W).\n✗ Forgetting the units (N).
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