Question

what is force

Answer 1

Force is defined as the product of mass and acceleration
F = ma

Answer 2

force is a push or pull that causes changes

Answer 3

The push or pull is called force

Answer 4

@Rohith15 the force can not always be given by the form F=ma. For example, let's consider the drag on an airplane flying through the air. What is the law for that force. One can hardly think that the law for that force will be simple. Try to imagine what makes a drag on an airplane flying through the air - the air rushing over the wings, the swirling in the back, the changes going on around the fuselage, and many other complications, and you see there is not going to ne a simple law. On the other hand, it is a remarkable fact that the drag force on an airplane is approximately a constant times the square of the velocity, or F ~ cv^2.

Now what is the status of such a law, is it analogous to F = ma? Not at all, because in the first place this law is an empirical thing that is obtained roughly by tests in a wind tunnel. You say, "Well F = ma might be empirical too." That is not the reason that there is a difference. The difference is not that is empirical, but that, as we understand nature, this law is the result of an enormous complexity of events and is not, fundamentally, a simple thing. If we continue to study it more and more, measuring more and more accurately, the law will continue to become more complicated, not less. In the other words, as we study this law of drag on an airplane more and more closely, we found out that it is "falser" and "falser," and the more deeply we study it, and the more accurately we measure, the more complicated the truth becomes; so in that sense we consider it not to result from a simple, fundamental process, which agrees with our original surmise.

I hope it made sense!