Gravity , The invisible force that pulls objects toward each other., Gravitational Pull, How strong gravity pulls on an object. Bigger objects, like planets, have a stronger pull., Mass, The amount of matter (or “stuff”) in an object., Weight, How heavy something is because of gravity., Acceleration, A change in how fast something moves. It can mean speeding up, slowing down, or changing direction., Inertia, The idea that objects want to keep doing what they are already doing—stay still or keep moving—unless a force changes it., Force, A push or a pull that can make an object move, stop, or change direction..

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