# A student is revising for a physics examination and writes down the following statements about physical quantities and their units. For each statement, state whether it is correct or incorrect, and if incorrect, give the correct unit. Statement 1: 'The SI unit of momentum is kg/s.' Statement 2: 'The SI unit of the moment of a force is Newton metre (Nm).' Statement 3: 'The SI unit of gravitational field strength is N/kg.' Statement 4: 'The SI unit of velocity is m/s².'

> Pearson Edexcel International GCSE Physics (4PH1) — 1.1 Units · State · 4 marks

> A student is revising for a physics examination and writes down the following statements about physical quantities and their units. Statement 1: 'The SI unit of momentum is kg/s.' Statement 2: 'The SI unit of the moment of a force is Newton metre (Nm).' Statement 3: 'The SI unit of gravitational field strength is N/kg.' Statement 4: 'The SI unit of velocity is m/s².'

## Mark scheme (4 marks)

1. Statement 1 is incorrect; the correct unit of momentum is kilogram metres per second (kg m/s).
2. Statement 2 is correct; the SI unit of the moment of a force is Newton metre (Nm).
3. Statement 3 is correct; the SI unit of gravitational field strength is N/kg.
4. Statement 4 is incorrect; the correct unit of velocity is metres per second (m/s).

## Key terms

- [momentum](https://www.gradenine.co.uk/glossary/momentum)
- [moment of a force](https://www.gradenine.co.uk/glossary/moment-of-a-force)
- [gravitational field strength](https://www.gradenine.co.uk/glossary/gravitational-field-strength)
- [velocity](https://www.gradenine.co.uk/glossary/velocity)

## Related

- [Revision notes for Pearson Edexcel International GCSE Physics (4PH1)](https://www.gradenine.co.uk/learn)
- [How to answer "State" 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-student-is-revising-for-a-bb7b0659) · Published by Druglandscape Ltd.