# A wooden block is placed on a rough horizontal surface. A student pushes the block with a horizontal force, but the block does not move. Explain why the block remains stationary, using the concept of resultant force.

> Cambridge International IGCSE Physics (0625) — 1.5 Forces · Explain · 4 marks

## Mark scheme (4 marks)

1. Friction acts on the block in the opposite direction to the applied force
2. Friction is equal in magnitude to the applied force
3. The resultant force on the block is zero
4. A zero resultant force means the block remains stationary / does not accelerate

## Key terms

- [resultant force](https://www.gradenine.co.uk/glossary/resultant-force)

## Related

- [Revision notes for Cambridge International IGCSE Physics (0625)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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Source: [GradeNine](https://www.gradenine.co.uk/q/a-wooden-block-is-placed-on-1a6b726f) · Published by Druglandscape Ltd.