(Concept: Force & Motion: When force is applied to an object, the motion of the object changes. A force(push or pull)is required to move a vehicle at rest. Forces are also required to stop a moving vehicle. Unbalanced forces initiate and influence movement. When a force is exerted on an object, the force can increase the speed of the object, change the direction of the object, or slow or stop the motion of the object. Balanced forces result in no movement. Friction is the force that opposes motion.