Question

18. When a car crosses a convex bridge, the bridge exerts
a force on it. It is given by

(a) F= mg +mv^2/r
(b) F=mv^2/r
(c) F = mg - mv^2/r
(d) F = mg +{mv^2/r}^2​

Answer 1

Explanation:

Let us suppose that the body exerts a force N on the surface when it travels through the convex surface.

The forces on the car is mg downwards and N upwards.

Hence the total force mg−N will provide the essential centripital acceleration to the car.

Hence mg−N=

R

mv

2

Hence N=mg−

R

mv

2

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Answer 2

Answer:

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