Question

A 100 n force is applied to a 30 kg block placed on a inclined plane

Answer 1

It is a very interesting real fact that Force has a value if and only if the force applied on any body is moving with an acceleration i.e the velocity should get increasing. If not Force is simply Zero.

Force = Mass X Acceleration

If Velocity is constant or not changing, then Acceleration is absolute 0

Resulting Force = Zero.

In this case, when the Applied force 100 N was acted on the box, initially the Net force had a value until the box accelerated to 5 m/min (motion) from 0 m/min (rest). Once the box attained the velocity of 5 m/min and became constant, the Net force became Zero.

So, Net Force = Applied Force - Frictional Force

As per above Explanation Net Force becomes 0 as the velocity becomes constant.

0 = Applied Force - Frictional Force

Applied Force = Frictional Force = 100 N (Answer)