what are newton's law?

Answer 1

1. An object in motion stays in motion and an object at rest stays at rest unless acted upon by another force.

2. The relationship between mass, acceleration, and force applied is defined as F=ma

3. For action there is an equal and opposite action.

Meanings.

1. This means that an object moving will keep moving forever unless acted upon, ie an object in space far away from any planets so gravity is not a factor, or a book sitting on a table stays there and doesnt move until you put a force on it by pushing it. Common mistakes here is to believe that a ball thrown into the air has no force acting on it and should move forever. However, the ball is being acted upon by earth's gravity.

2. This means that the by acting a net force of F on a object of mass m will accelerate with magnitude a in direction of F. This also agrees with rule 1 because if net force is 0 there is no acceleration so object maintains a constant velocity. Ex: A 4kg object has a force of 16 N act on it has an acceleration of 4 m/s^2.

3. This means that every action has an opposite action. Ex: if you step off of a boat, the boat moves away from you. Problems here ppl have is saying what is the opposite reaction when you throw a ball in the air and it comes down. Well when u throw the ball in the air there is a slight force downward to the ground. Also when the ball slows down and changes direction, the earth also should move to the ball, however due to the mass of the earth the movement is infinetly small.

Hope this helps

Answer 2

The answers above are correct. Then there's also, the force of gravity is proportional to the multiple of two masses and inversely proportional to the square of the distance between their two centers of mass. The formula for this is F = GmM/R^2; where m and M are the two masses, R is the distance, and G is a constant of proportionality.

That's Newton's gravity law; the other answers were about his laws of motion. Thought you might like to know ol' Newt did more than motion.