Q8 of 57 Page 96

In order to stop a car in shortest distance on a horizontal road, one should

The breaks should be applied hard but it should prevent slipping. It is because if we apply breaks harder than this, the car will slip and can cause harm to the driver. However, when the breaks are applied hard enough so that it becomes equal to the maximum static force of friction, the car will stop safely.

More from this chapter

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6

Suppose all the surfaces in the previous problem are rough. The direction of friction on B due to A

 7

Two cars of unequal masses use similar tires. If they are moving at the same initial speed, the minimum stopping distance

 9

A block A kept on an inclined surface just begins to slide if the inclination is 30°. The block is replaced by another block B and it is found that it just begins to slide if the inclination is 40o.

 10

A boy of mass M is applying a horizontal force to slide a box of mass M’ on a rough horizontal surface. The coefficient of friction between the shoes of the boy and the floor is μ and that between the box and the floor is μ’. In which of the following cases it is certainly not possible to slide the box?

A. μ < μ’, M < M’


B. μ > μ’, M < M’


C. μ < μ’, M > M’


D. μ > μ’, M > M’