7.3 friction
TRANSCRIPT
APPLICATION OF FRICTIONAL
FORCE
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LEARNING OUTCOMES:At the end of this lesson, students will
be able to:• Explain with examples the existance of
frictional force.• State the direction of frictional force.• Carry out an experiment (simulation) to show
how different types of surfaces affect frictional force.
• Explain the advantages and disadvantages of friction.
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What is Friction?
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• Friction is a force between two surfaces that are sliding and they must in contact with each other.• Examples: – The tyre of the lorry
is in contact with the road.
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• Friction always works in the opposite direction from the direction of the moving object.
• Can slows a moving
object down Moving
Friction
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Friction depends on…Roughness of the surfacesForce that objects are being
pressed one against the other
or Weights of the objects
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Simulation activity
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Advantages of friction
Prevents from slipping while walking
Stops the car from moving
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Climb a tree
Writing on the paper
Holding s spoon and fork for eating
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Friction produces heat.
Friction wears out the rubbing surfaces.
Friction produces noise.
Disadvantages of frictionSH.EFFASH.EFFA
Quizzes time!!!!!
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