When an object has its motion changed, the cause is generally __________.
Describe what would happen if, while wearing rollerskates, you pushed as hard as you could against a wall. Why does this happen?
Earth's gravity acts upon objects with a steady force of __________.
Describe the four main types of resistance forces.
Any external force that acts against movement is called __________.
Which object would have the most momentum?
Grady has been playing soccer for years. He is considered an expert in many aspects of the game, including kicking, passing, and dribbling. How could Grady have achieved the status of expert?
The measure of an object's mass and velocity is called __________.
Human muscles have an efficiency of about __________.
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