# Forces and Motion in hockey

## Newtons first law of Motion

Newtons first law is when an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

## Example in Hockey

A hockey puck will stay at rest unless a hockey stick comes into contact with it and if it is in motion, it will stay in motion unless something stops its movement. Such as an ice skate or a hockey stick.

## Newtons second law of motion

The greater the mass of the object being accelerated the greater the amount of force needed to exelerate the object.

## Example in Hockey

When they have to clean the ice in a hockey game, they clear the ice and remove all the pucks and the nets. The nets take more force to move across the ice then the tiny little pucks which need barely any force.

## Newtons third law of motion

For every action there is an equal and opposite reaction.

## Example in Hockey

When a hockey stick hits the hockey puck, the hockey puck exerts the same amount of force on the hockey stick that the hockey stick does to the hockey puck.

## Balanced Forces

Forces on an object that combine to give a zero net force and do not change the motion of the object.

Hockey example: having the same amount of force on both sides of the hockey puck.

## Unbalanced Forces

Forces that combin to produce a net force that is not equal to zero and cause the velocity of an object to change.

Hockey example: having a hockey stick on one side of the puck but nothing on the other side of the puck.

## Gravity

Attractive force between two objects and that depends on the masses of the two objects and the distance between them .

Hockey example: what keeps the hockey puck from flying off the ice and into the crowd.

## Friction

A force that opposes the sliding motion between objects that are in contact.

Hockey example: hockey puck moving across the ice the ice will slow it down.