Forces act on objects on Earth all the time, whether or not they are moving. If all the forward forces on an object are being balanced by ____ forces of the same size, then the forces ____ each other out, and the ____ force, is 0N. The same is true for upwards and downwards forces – unless one force is ____ overall than the force in the opposite direction, the resultant force is 0N. The only way we can change the movement of an object is to ____ the forces acting on it. Once the resultant force is bigger than 0N, something can start ____, or slow down, or speed up.

unbalanced forces

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