Quiz

Equilibrium on a Rough Horizontal Plane — Lesson quiz

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In which direction does friction act relative to the tendency of the body to move?

In the same direction as the tendency to move

Opposite to the tendency to move

Perpendicular to the surface, upwards

Vertically downwards with the weight

A body of weight 30 N rests on a horizontal plane with static coefficient of friction 0.2. What is the maximum friction?

0.2 N

30 N

6 N

150 N

A body of weight 50 N rests on a horizontal floor with coefficient of friction 0.4, and a horizontal force of 15 N acts on it. Does the body move?

Yes, because the 15 N force exceeds the maximum friction

Yes, because the 50 N weight exceeds the applied force

No, because the required friction of 15 N is less than its maximum of 20 N

No, because the required friction equals the 50 N weight

A body of weight 40 N is on the point of moving when a horizontal force of 12 N acts on it. Find the coefficient of friction.

0.3

0.03

3.33

0.33

A body of weight 50 N rests on a horizontal plane, and a force of 10 N acts on it at 30° above the horizontal. What is the normal reaction?

55 N

45 N

40 N

50 N

What is the angle of friction when μs = 1 ÷ √3?

45°

60°

30°

90°