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Newton's first law (force (A force is a push or pull. (A force can be…

- - - - An example is a paper clip can be moved by the force a magnet exerts, the pull of Earth's gravity, or the force you exert when you pick it up.
- - - - For example, the paper clip is not moving so the net force is zero .
        
        If the forces are in the same direction they add together to form the net force.
        
        If two factors are in the opposite directions, then the net force is the difference between the two forces, and it is the direction of the larger force.
- - - - Friction is the force that eventually brings your skateboard to a stop unless you keep pushing on it.
        
        friction also acts on objects that are sliding or moving through substances such as air or water.
- - - - If the forces are unbalanced forces, their effects don't cancel each other out
        
        Any time the forces acting on an object are unbalanced, the net force is not zero and the motion of the object changes.