Edexcel (KS4)

KS3 & KS4 science curriculum

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Physics
Year 11

Forces make things change

7 lessons

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  • BQ11 Physics: How do forces make things happen?

Description

This unit explores forces, interactions, and Newton’s laws, including motion, rotation, and momentum. It covers reaction times, stopping distances, and deceleration dangers. Emphasis is on force diagrams, calculations, experiments, and evaluating methods for accuracy and safety.

This unit builds on pupils’ prior learning from Energy of moving particles, where they explored how energy is transferred in different systems. It deepens their understanding by focusing on how forces cause changes in motion, including acceleration, deceleration, and impacts. This prepares pupils for the next unit, Gravity in space, where they will apply their knowledge to explore how gravitational forces affect the motion of planets, moons, and other celestial bodies, reinforcing the concept of forces in large-scale systems.

  1. Newton's Third Law
  2. Resultant forces and their effects
  3. Moments, levers and gears
  4. Balancing
  5. Force, mass and acceleration (a = (v – u)/t)
  6. Newton's Second Law
  7. Stopping (and estimating stopping distances)

  • The bigger the resultant force, the bigger the change on an object.
  • The moment of a force causes turning.
  • Levers are force multipliers or distance multipliers.
  • Objects that are harder to stop have a bigger momentum.
  • Work done is the total amount of energy transferred.
  • Work done is measured in joules (J).
  • Doubling the mass of a moving object doubles the energy it has because it is moving.
  • Doubling the speed of an object increases the energy it has because it is moving by four times.
  • The gravitational force acting on an object does work to speed the object up when it is falling.
  • Gravitational force (weight) = mass × gravitational field strength, W = mg.

91 units shown,

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