Principles of Force and Motion

BY: Sarah M. and Kaitlyn

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 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 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.

Have any questions?

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