ExpertEasy1 markShort Answer
AQA GCSE · Question 05.5 · Forces
The person walked slowest when going up some steps. Complete the sentence. Choose the answer from the box.
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When walking up the steps, the person did more work against the force of __________.
The person walked slowest when going up some steps. Complete the sentence. Choose the answer from the box.
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When walking up the steps, the person did more work against the force of __________.
How to approach this question
Consider the forces acting on the person. When walking on a flat surface, they work against friction and air resistance. When walking *up* steps, they are also lifting their own body weight upwards. Which force is responsible for pulling their body weight downwards?
Full Answer
Work is done when a force moves an object through a distance (Work done = Force × distance).
- **Air resistance** and **friction** are forces that oppose the person's forward motion.
- **Gravity** is the force that pulls the person's mass downwards. When walking up steps, the person has to lift their body vertically against the force of gravity. This requires doing work against gravity, in addition to the work done against friction and air resistance.
Common mistakes
✗ Choosing friction or air resistance. While work is done against these forces, the key additional force when going *up* is gravity.
Practice the full AQA GCSE Physics Foundation Tier Paper 2
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