1. Explain, from a force standpoint, why you need to reduce your normal driving

Question

1.   Explain, from a force standpoint, why you need to reduce your normal driving speed around curves when it rains.

2.   A disk and a sphere are released simultaneously at the top of an inclined plane. They roll down without slipping. Which will reach the bottom first?

3.   A satellite of mass M takes time T to orbit a planet. Discuss the dependence T vs M.

4.   Take a spring and cut it in half. What can you say about the spring constant of the smaller springs relative to the original one? Explain.

5.   Suppose you

Explanation / Answer

a)Because friction force is reduced due to wet tyres..

And this friction provides centrepetal force to the vehicle..

So

f=mv^2/r

So v is reduced

2)Both will reach at same time

3)T^2 =(4pi^2/GM)*R^3

4)KL =Constant

K is stiffness and L is length

So if L'=L/2

K'=2K (ans)

5)Because torque exerted on branch will increase and will tend to break it at the trunk..

6)No, because static friction balances the normal froce applied by the wall (ans)

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