Motion is... - movement., Force is - a push or pull that acts on an object., If force acts upon an object, it will change it's... - position or location., Gravity   - the force that pulls things down toward the surface of the Earth and keeps them from floating away into space., Friction - a force that makes things slow down or stop., Friction is greater between... - rough surfaces., Friction is less between... - smooth surfaces., Inertia  - an object in motion will stay in motion, or an object at rest will stay, Changes in gravity, friction, or mass will affect... - the motion of an object., Two forces that work against inertia - gravity and friction, All matter... - has mass and takes up space., Objects with more mass need... - more force to move.,

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