Resultant Forces and Work Done

  • Created by: Davwi
  • Created on: 19-02-19 05:22

Free body diagrams

  • The sizes of the arrows show the magnitude of the force.
  • The directions show the direction of the force.
  • A free body diagram only incorporates forces exerted on an object and not the force the object exerts to its surroundings.
  • Here is an example: See the source image
  • In this example you can see the different amounts of gravity and air resistance that contribute to a drop.

Resultant Force

  • In most real situations, there are at least 2 forces acting on an object.
  • If you have a certain number of forces acting on a single object, you can replace them with a single force, so long as this single force as the same effect as all the forces added together.
  • This is called the resultant force.
  • If the forces all act in the same direction, then you add them to get your resultant force, and subtract any going in the opposite direction.
  • When a force moves through a distance, energy is transferred, therefore work is done.
  • To make something move, or keep it moving in the case of frictional forces, a force must be applied.
  • The thing applying the force needs a source of energy.
  • The force does work to move the object and energy is transferred from one store to…


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