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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