# Science

## Newtons first law of motion

A physical law stating that and object at rest tends to stay at rest and an object moving in a straight line at a constent speed tends ot continue moving that way. EXAMPLE.. A ball resting in the aisle of a bus that is moving at a constant velocity when the driver steps on the brakes the bus slows down and the ball rolls torward the bus driver.

## Newtons second law of motion

A  physical law that states that an objects accleration depends on the objects mass and amount of net force applied to it. EXAMPLE.. A baseball pitcher threw a fast ball to you, then the pitcher threw a tennis ball at exactly the same speed would it be easier to catch than the baseball?

## Newtons third law of motion

a physical law states that for every action there is an equal and opposite reaction. EXAMPLES.. when a baseball player swings and hits a baseball with a baseball bat the baseball exerts a force on the bat.

## Newtons law of universal gravitation

A physical  law starting that the planets the stars and the sun all exert gravitational forces.

## Momentum

The mass of an object multiplied by its velocity. A baseball has more momentum than a tennis ball.

## Weightlessness

The state of being without weight.