PH-1408
Friction and air resistance
Physics · Secondary 4 · Medium · Friction and air resistance
A block of mass 4.0 kg rests on a horizontal surface. The coefficient of friction between the block and the surface is 0.25. Take . What is the frictional force when the block is just about to move?
- 10 N
- 4.0 N
- 14 N
- 40 N
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