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Year 8 - Science

Newton's First Law

Moving by force

Unit Summary

This unit explores speed, forces, and motion, including effects on objects. It covers deriving equations, calculations, and distance-time graphs. Learn to use force arrows, identify balanced and unbalanced forces, and understand their impact on movement.

Lesson Summary

You will learn to describe and explain how a resultant force can change the movement of objects.

Key Notes

  • Resultant forces make the movement of things change.
  • Friction acts against the direction of movement of an object.
  • An object will continue to move at a steady speed in a straight line unless a resultant force is acting.

Vocabulary To Learn

  • stationary: A stationary object is not moving.
  • resultant force: A resultant forces the sum of all forces acting on an object.
  • frictional force: Frictional forces act between surfaces, to oppose the movement of an object.
  • gravitational force: The gravitational force on an object pulls it downwards, towards Earth.

Common Mistakes To Avoid

  • Pupils believe driving forces are needed to keep objects moving at constant speed.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

Resultant forces make the movement of things change. Friction acts against the direction of movement of an object.

2. Define this scientific word and use it in context. 'stationary'

A stationary object is not moving. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Pupils believe driving forces are needed to keep objects moving at constant speed. Correction: Demonstrate that friction (and drag) bring objects to a stop, showing that different surfaces produce the forces that slow objects.

More Lessons In This Unit

Browse all guides in the Year 8 Science guide library.