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Preview questions
1. What is friction?
A force that opposes motion · A type of energy · A measure of speed · A form of gravity
2. Which of the following surfaces will produce the least friction?
Wood on wood · Ice on ice · Rubber on concrete · Metal on metal
3. What factors affect the frictional force between two surfaces?
Weight and surface texture · Temperature and color · Speed and weight · Shape and size
4. Which type of friction occurs when an object is at rest?
Static friction · Kinetic friction · Rolling friction · Fluid friction
5. What is kinetic friction?
Friction when an object is moving · Friction when an object is at rest · Friction in liquids · Friction in gases
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