The stone from the earlier example may roll after it hits the ground, but it will eventually stop. In this case, the object would be at rest. 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. ![]() ![]() 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.įorce is a vector, meaning that it has a direction. For example, when a stone is released, it falls down because it is pulled by the Earth’s force of gravity. 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.
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