Chapter 3 Forces Part 3  Friction
• explain the effects of friction on the motion of a body
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When a block of wood of mass 2 kg is pushed along the horizontal flat surface of a bench, the friction force measured is 4 N. When the block is pushed along the same bench with a force of 10 N, it moved with a constant ________________.
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1 point
speed of 3 m/s
speed of 5 m/s
acceleration of 3 m/s²
acceleration of 5 m/s²
A box of mass 4 kg moves horizontally with a constant speed of 1.5 m/s when a force of 10 N is applied. What is the acceleration of the box if the applied force is 18 N?
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2.0 m/s²
4.5 m/s²
5.3 m/s²
7.0 m/s²
When a heavy box of mass 20 kg is pushed along the horizontal flat surface of a floor with a force of 10 N, the box moves with a constant acceleration of 0.2 m/s². Calculate the frictional force of the floor surface.
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2 N
4 N
6 N
8 N
A car is accelerating along a road in the direction shown. The wheel shown is connected to the engine. In which direction is the force of friction exerted by the road on the car tyre?
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B
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D
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