High Impact

Force:
We need force to make objects move. It could either be push or pull. Force can make things speed up or slow them down. e.g if you saw your little brother having a hard time trying to push a toy train, you would go and help him try to push that train and when you push that train down the track that's called force.Your using force by pushing is toy train along!


Friction: 

Friction is what cores a object to stop while moving. Friction is when a objects force is rubbing across the surface that its on, which normally makes it slow down or stop. e.g when your in a car and your trying to go up a steep road, but your car is getting up there because of the friction on the ground and the stones can stop this car. 


Potential Energy:
Potential Energy is the energy that you give it by adding pieces that bend and swirl so it collects up speed as its going. e.g say you were adding pieces to a marble run! Adding more bending and swirling pieces will gather up speed which helps the marble go faster and faster while rolling on the course.


Unbalanced Force:
Is a object that is not moving and stays completely still. And its also a object is moving and stays at the speed. Which is how they are both balanced forces. 
Forces that change the motion of a object are called Unbalanced Forces!