Since velocity is both speed and direction, acceleration applies to changes in both speed and direction. Oscar s mass is 70 kg and Jennie s mass is 40 kg. A ball is thrown 20 meters by a boy 5 meters off the ground. Mass is the quantity of matter in an object. The measure of inertia or laziness an object exhibits in response to any effort made to start, stop, or change its state of motion.
Weight is the force of gravity on an object.
Not the absence of gravity, but the absence of a support force. The ground pushes the cart equally forward because the horse pushes on the ground. This is proven by Newton s 3 rd Law of Motion. The acceleration produced by a net force on an object is directly proportional to the magnitude of the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object. A skydiver jumps out of an airplane.