Question

Joey drags his 25kg brother across the floor with a force of 12 N to the right at a constant velocity. Determine the normal force and the frictional force applied to the little brother. Draw the force diagram before solving the problem.

Answer 1

Since the velocity is constant, using Newton's First and Third Laws we know that the Friction and the Force are equal. So the friction is -12 Newtons.

Now the Normal Force (N) is also equal to the weight since the body is at a perfect balance.

So Weight is m*g = 25*10 = 250N

So N=250N