A gear is

A mechanism is defined as

Mechanical advantage is

A gear train is

Hand tool is defined as

Friction

A simple machine is

Gears can accomplish which of the following?

A ball is rolling in a straight line over the hardwood floor of a hallway. Suddenly the ball is struck from the right by a running cat. The ball is now rolling left. This is an example of which of Newton's laws of motion in action?

Friction causes heat. What else does it cause?

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