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Velocity and Forces

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Agenda

  • Velocity and Forces
  • Practice

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Velocity and Forces

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Velocity and Forces

  • Examples
    • A plane moves through the wind
    • An object is pushed by another object
    • A swimmer swims across a current
  • The resultant (final velocity or force) is found by adding vectorially using the parallelogram law
  • With these problems, always draw a diagram!

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Velocity

  • Speed is distance travelled divided by time

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  • Velocity is a direction, where the magnitude is given by the speed
  • Velocity and distance vectors are different!
  • Units of velocity are often m/s, or km/h

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Force

  • A force is like “a push” acting on an object
    • See your physics classes for lots of examples 👍
  • Units are typically in Newtons (N) (kg)(m)/s^2
  • Forces in equilibrium mean the forces cancel out (vectorially) on the object
    • No net force acting on the object

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Force

  • Force is connected to acceleration by

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  • The force due to gravity is

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  • Where and always points to the centre of the Earth

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Practice

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Practice

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Credits

Special thanks to all the people who made and released these awesome resources for free:

  • Presentation template by SlidesCarnival
  • Photographs by Startup Stock Photos

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