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Learning objective

Know that an object will stay at rest or move in a straight line at a constant speed unless acted upon by a resultant force.

Read the explanation, check the common trap, then practise with flashcards and questions.

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Exam focus

  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE Combined ScienceMotion, forces and energyCore content

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Quick explanation

Know that an object will stay at rest or move in a straight line at a constant speed unless acted upon by a resultant force

  • This point belongs to Forces, especially Forces outcomes.
  • You need to be able to know that an object will stay at rest or move in a straight line at a constant speed unless acted upon by a resultant force.
  • The key ideas to know are State, Explain, and Describe.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

StateExplainDescribe

Why it matters

This objective helps connect Forces outcomes to exam-style questions, flashcards, and revision notes for Forces.

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Practice Questions7 linked questions

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Paper 3 structured question: Forces

Paper 3Theory (Core)2 marks

Description

Motion of a Car

A car is moving at a constant speed of 60 km/h on a straight road. There are no forces acting on it except for the friction with the road.

  1. a

    Explain why the car continues to move at a constant speed.

    Aim for approximately 2 distinct marking points.

    [2]
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Cambridge IGCSECombined Science resources