# Changes In Motion

## Newton's Laws Of Motion

2nd Law.) Accelration depends on an object&apos;s mass and the amount of net force applied towards it. This law can be written as a formula:A=F/M       3rd Law.)For every action force there is an equal and opposite reaction force. When a person throws a ball at you and you miss it, the ball hits your face. The reaction is your face pushing back at the ball.

## Newton's Universal Law of Gravitation

After Newtons glorious find on the 3 laws of motion, he found out that all objects, planets, stars, and particles of matter, have a gravitational pull. This very find changed scientists ways to look at things. Newtons explanation made things a bit more clearer. His explanation explained the Moons orbit around the Earth and the Earths orbit around the Sun. This explaining is Newtons Universal Law Of Gravitation.

## Weightlessness

The definition of weightlessness is being in a state without detectable weight. But gravity is still pulling downward towards Earths mass. For example, a swimmer is going to jump off a high diving board. He or she is ready to jump and she weighs about 100lbs, he or she jumps and you can no longer detect what her weight is. Astronauts feel the very same way while their orbiting the Moon or seeing Earths atmosphere.

## True Weightlessness

Gravitational force occurs in all the objects of the Earth and out of the Earth. The Sun, as massive as it is, is weaker than stars when being pulled towards a gravitational pull.

## Action-Reaction Forces

This basically is what Newtons 3rd law of motion is all about. An action is like a girl is about ready to throw a ball at a boy who is going to catch it. The girl unexpectedly throws it at the boy, the ball hits him in the face. The reaction is the ball bouncing back off the face and the boy falling to the ground. There are many Action-Reaction forces out there.