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Questions and Answers
What is the primary reason why friction always works in the direction opposite to which an object is moving or trying to move?
What is the primary reason why friction always works in the direction opposite to which an object is moving or trying to move?
- It increases the speed of the object.
- It prevents unnecessary sliding.
- It slows down the moving object. (correct)
- It produces more heat.
Which factor is directly responsible for the heat production when two surfaces rub against each other?
Which factor is directly responsible for the heat production when two surfaces rub against each other?
- The weight of the object.
- The friction between the surfaces. (correct)
- The speed of the movement.
- The air resistance acting on the surfaces.
Why is friction important for preventing our shoes from slipping on the pavement?
Why is friction important for preventing our shoes from slipping on the pavement?
- It creates a gripping force between the shoe tread and the ground. (correct)
- It provides energy to our steps.
- It reduces the weight of our body on the pavement.
- It acts to increase our walking speed.
In which situation would reducing friction be desirable?
In which situation would reducing friction be desirable?
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How do ball bearings contribute to the reduction of friction in many machines?
How do ball bearings contribute to the reduction of friction in many machines?
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Study Notes
Friction Basics
- Friction is a force between two surfaces that are sliding, or trying to slide, across each other.
- Friction always works in the direction opposite to the direction in which the object is moving, or trying to move.
- Friction always slows a moving object down.
Friction Effects
- Friction produces heat.
- Examples of friction producing heat: rubbing hands together quickly, making them feel warmer.
Friction in Everyday Life
- Friction is useful for preventing our shoes from slipping on the pavement when we walk.
- Friction stops car tyres from skidding on the road.
- When walking, friction is caused between the tread on shoes and the ground.
- This friction acts to grip the ground and prevent sliding.
Reducing Friction
- Friction can be reduced by using oil between the moving parts inside a car engine.
- Ball bearings are used in many machines to reduce friction.
- Reduced friction means less wear on the moving parts and less heat produced.
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