January 15, 2017

Physics: Friction and Gravity

The strength of the force of friction depends on two factors: the types of surfaces involved and how hard the surfaces push together.

il_fullxfull.250203781There are different kinds of friction:
  • sliding friction - when one solid surface slides over another.
  • rolling friction - when a object rolls over a surface.
  • fluid friction - when an object moves through a fluid. 


Free fall - when the only force acting on a falling object is gravity.
Terminal velocity -  the maximum velocity a falling object achieves.

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