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Year 10 - Science

The energy of an object in a gravitational field (E=mgh)

Energy of moving objects

Unit Summary

This unit covers energy changes in systems through heating, forces, and electrical work. It includes energy storage, efficiency, and transfer methods like insulation. Emphasis is on calculating energy, conducting experiments, interpreting data, and communicating findings accurately.

Lesson Summary

You will learn to calculate the change in energy of an object because of its movement in a gravitational field.

Key Notes

  • When an object moves upwards, work is done against the gravitational force.
  • The gravitational force acting on an object does work to speed it up when it is falling.
  • Weight = mass x gravitational field strength, W = mg
  • Gravitational potential energy of an object = mass × gravitational field strength × height

Vocabulary To Learn

  • gravitational store: Objects have energy in the gravitational store because of their mass and their height.
  • work done: Work is done whenever a force makes an object move. The amount of work done is equal to the force multiplied by distance moved in the direction of the force.
  • weight: Weight = mass × gravitational field strength, measured in newtons.
  • gravitational field strength: Gravitational field strength, g, is the force per kilogram caused by a gravitational field.
  • gravitational potential energy: The energy stored in an object due to its height above the ground.

Common Mistakes To Avoid

  • Pupils often think that the amount of energy in the gravitational store depends on the path taken by an object to change its height, or the speed of an object at a particular height.

3 Quick Questions (With Answers)

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

When an object moves upwards, work is done against the gravitational force. The gravitational force acting on an object does work to speed it up when it is falling.

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

Objects have energy in the gravitational store because of their mass and their height. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Pupils often think that the amount of energy in the gravitational store depends on the path taken by an object to change its height, or the speed of an object at a particular height. Correction: Teaching should include examples of objects increasing height by the same amount by different routes, and examples of objects at the same height moving at different speeds.

More Lessons In This Unit

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