Physics › Section C · Forces and Newton's laws › Topic C.2

Newton's second law and systems

The first law says a net force changes motion; the second law says by exactly how much. It links force, mass and acceleration in one equation, and it explains why mass and weight are different things.

In this topic

  • From the first law to the second
  • Systems, internal and external forces
  • Newton's second law
  • The newton
  • Working in components
  • Worked example: an electric scooter
  • Weight
  • Mass versus weight
  • Worked example: a drone climbing
  • Common mistakes to avoid
  • Key takeaways

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