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Friction

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A sled weighing 300 N is moved at a constant speed over a horizontal floor by a ... Determine the force of friction between the sled and the floor. ... – PowerPoint PPT presentation

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Title: Friction


1
Friction Inclined Planes
2
Friction
Coefficients of Friction
  • What affects friction?
  • Normal Force
  • Ffriction µFnormal
  • Types of Friction
  • Static
  • What you need to overcome in order to make an
    object move
  • Kinetic
  • When an object is moving
  • Can be sliding or rolling

3
Friction Examples
  • A sled weighing 300 N is moved at a constant
    speed over a horizontal floor by a force of 50 N
    applied parallel to the floor.
  • Draw a free body diagram.
  • Determine the force of friction between the sled
    and the floor.
  • Determine the coefficient of kinetic friction.
  • A horizontal 100 N force is applied to a 50 kg
    classmate resting on a level tile floor. The
    coefficient of kinetic friction is 0.15.
  • Draw a force diagram.
  • What is the force of friction?
  • What is the acceleration of the classmate?

4
Inclined Planes
  • What do I do???
  • Draw a free body diagram.
  • Determine the weight of the skier. Think about
    the direction of the weight vector.
  • Use the weight of the skier to find the normal
    force (and then the force of friction). Think
    about the direction of the normal force what
    does NORMAL mean?
  • Use the weight of the skier to find the force of
    gravity that is pulling the skier down the hill.
  • Find the net force and use Newtons 2nd Law.

5
Inclined Planes
  • A trained 50 kg sea lion slides from rest with a
    constant acceleration down a 3.0 m long ramp into
    a pool of water. If the ramp is inclined at an
    angle of 23 above the horizontal and the
    coefficient of friction between the sea lion and
    ramp is 0.26, how long does it take the sea lion
    to make a splash in the pool?
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