2.) FORCE
Force is defined as a push or pull acting on an object. Forces include gravity, friction, and applied force. Force causes changes in the speed or direction of motion. These changes are called acceleration.
3.) FRICTION
Friction is the resistance to motion created by two objects rubbing against each other (the sled and the snow, for instance). Even air causes friction. Friction creates heat. The effect of a force depends on the object's mass.
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