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Physics defines force as an influence that changes the movement of a body, be it external movement or movement within the body, such as changing its shape. For example, when a stone is released, it falls down because it is pulled by the Earth's force of gravity. During the impact, it bends the blades of grass that it falls on — the force of the weight of the stone is making them move and change their shape.
Force is a vector, meaning that it has a direction. When several forces are acting on an object and pulling it in different directions, these forces may be in equilibrium, meaning that their vector sum is zero. In this case, the object would be at rest. The stone from the earlier example may roll after it hits the ground, but it will eventually stop. The force of gravity is still pulling it down, but at the same time the normal force, or ground reaction force, is pushing the stone up. The net sum of these forces is zero, they are in equilibrium, and the stone is not moving.