1. 3.2 friction Friction is a force that opposes motion.
fluid
A force that resists the motion between two surfaces in contact.
air resistance
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2. Friction is a force that opposes motion.
3.2
Friction is a force that opposes motion.
Frictional force depends on–
friction
• types of surfaces
fluid
• motion of surfaces
air resistance
• force pressing surfaces together
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3. 3.2 fluid Friction is a force that opposes motion.
A substance that can flow easily, such as a gas or a liquid.
air resistance
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4. 3.2 air resistance Friction is a force that opposes motion.
fluid
The fluid friction due to air.
When an object moves through a fluid, it pushes the molecules out of the way.
air resistance
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5. Friction is a force that opposes motion.
3.2
Friction is a force that opposes motion.
Air resistance is a type of friction.
friction
air resistance
gravity
fluid
air resistance
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6. Friction is a force that opposes motion.
3.2
Friction is a force that opposes motion.
How does the shape of an object affect how it falls?
Use three sheets of paper and design an experiment to test your theory.
Remember you need to use the whole sheet of paper each time.
To test your theory drop the paper at the same time and see which hits the ground first.
friction
fluid
air resistance
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7. Friction is a force that opposes motion.
3.2
Friction is a force that opposes motion.
Air resistance depends on:
Surface area
Larger surface area more resistance.
Speed
Faster it moves the more molecules it hits, therefore it has more air resistance.
friction
fluid
air resistance
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