Question

state different steps in applying Newton's Law explain with an example

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Answer 1

If an object is in equilibrium, then it is not accelerating. Newton's first law says that if an object is not accelerating, then the net force on the object must be zero. Therefore, anytime you have an object that is NOT accelerating, you should think about using Newton's first law.

Let's look at an example. Suppose that you push a box across the floor at a constant speed of 5 m/s. You know that you are pushing on the box with a force of 150 N. Why is the box not speeding up?

At first glance, it's easy to look at this situation and assume that there must be a net force in order to keep an object moving. In fact, this was what almost everyone believed before Newton, and many people still believe this today. Newton's first law lets you know that this is NOT what is happening, though.

You know that because the box is moving at a constant velocity, the net force on it must be zero. If you are applying a 150 N force to the box, then there must be another force acting on the box in the opposite direction. That is the only way that the net force could be zero!

What is this mysterious force? We call it friction. Anytime two surfaces slide past each other, there is some friction between them. What is the magnitude of the force to prevent the box from moving? Well, if you apply a 150 N force to the box and the net force is zero, then the friction force must also be equal to 150 N and it must act in the opposite direction from which you are pushing.

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