physical change, a change in the size, shape, or state of matter, chemical change, a change in matter, resulting in a new substance being formed, matter, anything that takes up space and has mass, weight, the measure of the force of gravity on an object, mass, the amount of matter in an object, gravity, an invisible force that pulls objects towards each other, friction, a force that opposes movement when two surfaces touch, inertia, an object's tendency to remain at rest or stay in motion, acceleration, speeding up, slowing down, or turning, velocity, the speed of an object in a certain direction, momentum, a measurement of mass in motion, air resistence, a type of friction that prevents things from moving quickly through air, static friction, type of friction that stops movement between two objects, sliding friction, type of friction when an object is pushed across a surface

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