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ZIMSEC O-Level Physics

3.2Effect of force on motion

Effect of force on motion in ZIMSEC O-Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic36 practice questions3 lessons

Overview

Form 3. Limited to linear motion; conservation of momentum is not required.

Learning objectives

What the syllabus expects you to be able to do.

  1. 3.2.1Define weight, momentum and inertia.
  2. 3.2.2Calculate momentum using p = mv.
  3. 3.2.3Explain each of Newton's three laws of motion.
  4. 3.2.4Use the relationship F = ma between force, mass and acceleration.

Lessons

  • Mass, weight and gravitational field strength

    20 min

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  • Momentum and impulse

    30 min

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  • Resultant force and Newton's laws

    30 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Effect of force on motion: sample question

1 mark

A sack of maize meal has a mass of 20 kg20\ \text{kg}. Taking g=9.8 N/kgg = 9.8\ \text{N/kg}, calculate its weight.

Answer in N.

Turn Effect of force on motion into a strength.

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