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The force that pulls all things to the Earth.
Gravity
The point around which an object's weight is evenly distributed is called ________.
Center of Gravity
The tendency of an object to stay in motion.
Momentum
The force that acts between materials as they move past each other.
Friction
When tires roll over the surface of the road, they create a form of friction called ___________.
Traction
The grooved surface of a tire is called _________.
Tread
A moving object has __________, or kinetic energy.
Energy of Motion
Objects that are at rest tend to stay at rest and objects that are moving tend to keep moving.
Inertia
The force with which a moving object hits another object is called _____________.
Force of Impact