First slide

Second law

Question

A body of mass 2 kg moving on a horizontal surface with an initial velocity of 4 m/sec comes to rest after 2 sec. If one wants to keep this body moving on the same surface with a velocity of 4 m/sec, the force required is

Easy

A

8 N
B

4 N
C

zero N
D

2 N

Solution

If f be the frictional force acting on the body, then $4− (\frac{f}{2}) \times 2 = 0 \Rightarrow f = 4 N$
Force required to keep the body moving at 4 m/s = f = 4 N.

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