This document discusses frictional force, including that it is a force between two surfaces in contact that opposes their motion relative to each other. Frictional force always acts in the opposite direction of motion and depends on factors like the roughness and pressing force of the surfaces. The document outlines learning objectives about friction and its direction, provides examples of friction, explains how surfaces affect friction through a simulation, and discusses the advantages of friction in preventing slipping as well as the disadvantages like producing heat, wear, and noise.

1. APPLICATION
OF FRICTIONAL
FORCE
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2. 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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3. What is Friction?
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4. • 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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5. • 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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6. Friction depends on…
Roughness of the surfaces
Force that objects are being
pressed one against the other
or
Weights of the objects
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7. Simulation
activity
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8. Advantages of friction
Prevents from slipping while walking
Stops the car from moving
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9. Climb a tree
Writing on the paper
Holding s spoon and fork for eating
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10. Friction produces heat.
Friction wears out the rubbing surfaces.
Friction produces noise.
Disadvantages of friction
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11. Quizzes
time!!!!!
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