Question

what do you need to describe force

Answer 1

1) Force is a push or pull

2) Force is the capacity to do work or cause physical change

3) Force= Mass times acceleration (F = ma)

4) A force is that which changes or tends to change the state of rest or motion of a body.

Examples:

For simplicity sake, all forces (interactions) between objects can be placed into two broad categories: contact forces, and forces resulting from action-at-a-distance.

Contact Forces include: frictional forces, buoyant forces, normal forces, and air resistance forces

Action-at-a-distance forces include: gravitation, electrostatic and magnetic forces.

Answer 2

I personally find formal definitions of a force, in physics, to be vague. Definitions indicate that it is a form of interaction or influence of one object upon one another (and, according to Newton is equal and opposite). At least one definition indicates that when two object cease to interact with one another the force ends.

Some of my problems with such definitions include the following:
1. It is unimaginable to me that there could be two objects in the universe that are not interacting to some extent, no matter how infinitesimally small the amount of that interaction, or "force," might be. It might not be measureable beyond some distance, but how can it be zero, I wonder;
2. But what makes number one more complicated is when two objects interact over vast distances, how long does it take for the "information" or the fact of interaction to travel from one place in the universe to another that is far away - for, say, a million light years distance. To be more precise, if mass A is sending out attraction for a mass B that is far away, what gets attracted? Is it B as B was configured in mass/energy at the time the attractive force initiates, or as B is when that force arrives at B.

Number two would depend, in the case of gravity on what speed gravity travels, if it travels at all. If gravity is a bending of space time, then that bending may be imagined as not traveling at all. On the other hand, if gravity consists of discrete bundles of energy, called gravitons, then do they travel at the same speed as light, I wonder.

It seems to me no one really knows what the classically theorized types of force are.

In quantum physics there is something that goes on between certain particles of matter at a distance called by Einstein and others "spooky action at a distance."

Sometimes in the teaching of science, definitions are made to appear much simpler and better understood than they actually are. Perhaps some day you will do some cutting edge research, seeking answers to such things.

In a highschool physics class, you would probably get credit for providing a definition from a dictionary of physics terms, or from a textbook. ( : > )

Some cutting edge scientists have observed that each time a question is answered definitively in science, the answer raised several new questions. That's one of the things that makes research and theoretical science efforts so challenging.

Answer 3

I say look on google I mean u post this on here looking for answer just search on google....? if not read others...^^^^