what type of forces change an object's motion?
Forces change motion. A force is a push or a pull. Forces give energy to objects to cause them to start moving, stop moving, change direction, or change the shape of objects. Forces are required to accelerate an object. Types of Forces: 1) Contact Force is when one object pushes or pulls an object by touching it. 2) Gravity is the force of attraction between two masses. 3) Friction is the force that resists motion between two surfaces in contact with each other.