# Principles of Force and Motion

## Describing Motion and how it works

Motion is a change in position. An example of an object that can be in motion is a soccer ball. It can be in motion if someone kicks it.

## Types of motion

Objects, like a soccer ball, can go in different directions or stay the same. Like a cone. If you roll it, it goes in a different direction . A football does that too. But a soccer ball or a base ball goes in the same direction and it does not change the motion that it is in.

## How Force affects Motion

There are different types of forces. Like when you roll a soccer ball that represents a ball that is not changing motion . A cone represents an object that does change position. That is also friction because the soccer ball is {skimming} the grass or turf.

## Unbalanced Forces

An unbalanced force is when more mass is on one side and less on the other. Example is tug of war, when 3 people are playing tug of war 2 people have to be on one side and 1 on the other the person that has 2 people on one side will most likely win.

## Force

Force is a push or a pull. Example is when someone is pushing a box somewhere than that is force because that is a push. Another example is when you get something off the table or counter that is technically a pull so that is force.

## Gravity

Gravity is what the earth does to us to keep us down so we don't fly random places. Also gravity is always a pull never a push because gravity is pulling us down to earth. This is an example of gravity.

## Vocabulary Words

1) Motion-is a change in position

2) Force-is a push or a pull

3) Friction-is a force that acts between two objects or surfaces that are rubbing against each other, it acts against motion.

4) Gravity-is a force of attraction between two objects, it is always a pull never a push.

5) Balanced forces-it doesn't change the motion of an object

6) Unbalanced forces-it changes the motion of an object