ForcesFrictional Force

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Let’s reviewWhat is force?

Force is…

• A push or pull upon an object

• It can change the motion of an object

• Measured in newtons • Gravitational and Frictional

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Frictional ForceForce

Frictional force is…

• Force that opposes motion

• Produced when two surfaces rub against each other

• Can occur in solids, liquids and gases

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Frictional ForceA force that opposes motion

Effects of Frictional Force• Slow down or

stop moving objects

• Prevent objects from starting to move

• Affects movement on different surfaces

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• Frictional force acts on objects moving through air

• Air flow, pushes against moving objects and slow it down.

• Acts in an upward direction

What affects frictional force?Frictional force a force that opposes motion

Air Resistance

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• Frictional force acts on objects moving through water

• Water, pushes against moving objects and slow it down.

• Acts in an upward direction

What affects frictional force?Frictional force a force that opposes motion

Water Resistance

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What affects frictional force?Frictional force a force that opposes motion

Advantages of Friction

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• Cause things to slow down • Overheating • Wear out

• Lubricants • Oil • Grease

• Wheels and rollers

What affects frictional force?Frictional force a force that opposes motion

Disadvantages of Friction

Ways to overcome friction

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