7.3 friction

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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