Starter quiz
- Which is the best description of a friction force?
- The downwards force due to gravity.
- The force of one surface gripping or rubbing on another surface. ✓
- The force from the air that slows down moving objects.
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- Which picture shows a friction force?
- Which factor can affect the size of the friction force acting when an object slides over a surface?
- The colour of the surface.
- How rough the surface is. ✓
- How transparent the surface is.
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- Give the correct direction: Friction forces always act ______ on a moving object.
- 'backwards' ✓
- Which sentences describe the correct effects that friction forces can have on objects?
- Friction forces slow down moving objects. ✓
- Friction forces can repel objects away .
- Friction forces can heat up objects. ✓
- Friction forces pull objects back down towards planet Earth.
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- An object is sliding along a surface. Which of the following can reduce the friction force?
- If the surface was smoother. ✓
- If the surface was rougher.
- If the surface was sanded down. ✓
- If a slippery liquid or grease was added between the object and the surface. ✓
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Exit quiz
- Which best describes what a friction force is?
- The force of one surface touching another surface.
- The force of one surface repelling another surface.
- The force of one surface gripping or rubbing on another surface. ✓
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- Which picture shows the friction force of the ice on the sliding puck?
- The size of a friction force between dry surfaces is affected by how ______ the surfaces are.
- 'rough' ✓
- Any substance added between two surfaces to reduce friction is called a ...
- 'lubricant' ✓
- Which gives the best explanation of how lubricants reduce friction?
- Lubricants are slippery.
- Lubricants should stay in place and not promote rusting.
- Lubricants keep surfaces slightly further apart. ✓
- Lubricants are liquids so can flow.
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- Identify the false statement.
- Friction forces can slow down an object.
- Friction forces can prevent movement.
- The size of the friction force between two surfaces can change.
- Friction forces only act when there is movement. ✓
- Friction occurs when tiny irregularities catch, producing backwards forces.
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Friction is the force of one surface gripping or rubbing on another.
- Friction prevents or slows down movement between surfaces.
- Friction is caused by the roughness of surfaces.
- Lubricants are substances added between two surfaces to reduce friction.
Common misconception
Friction is not a force.
Provide examples of friction slowing objects and preventing them from moving when they are pushed.
Keywords
Friction - Friction is the force of one surface rubbing or gripping on another.
Rough - Rough surfaces are uneven or irregular, they are not smooth.
Irregularities - An irregularity is something different to what is expected.
Microscopic - If something is microscopic, it is so small you need a microscope to be able to see it.
Lubricant - A lubricant is a substance added between two surfaces to reduce friction.
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