Integrated Movement

Any external force that acts against movement is called __________. A. gravity B. efficiency C. resistance D. momentum

C

Earth's gravity acts upon objects with a steady force of __________. A. 8.9 meters per second B. 9.8 meters per minute C. 8.9 meters per minute squared D. 9.8 meters per second squared

D

The measure of an object's mass and velocity is called __________. A. gravity B. acceleration C. inertia D. momentum

D

When an object has its motion changed, the cause is generally __________. A. an external force B. an internal force C. an existential force D. an interval force

A

Human muscles have an efficiency of about __________. A. 9 to 17% B. 18 to 26% C. 27 to 35% D. 36 to 44%

B

Which object would have the most momentum? A. a 500-pound car moving at 20 miles per hour B. a 200-pound car moving at 60 miles per hour C. a 100-pound car moving at 80 miles per hour D. a 50-pound car moving at 100 miles per hour

B

Any individual can become an expert in anything.

False

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?

Generally, a person becomes an expert through a process of learning and then perfecting a technique through practice. In any particular area of achievement, there are many techniques that have to be learned, either through direct instruction or by watching others perform them. Once those techniques are learned, they must be practiced. Becoming an expert at all of the techniques, which can be rolled into a skill, requires a large amount of deliberate practice, practice where feedback and progress is carefully monitored. In general, 10,000 hours of deliberate practice is needed to become an expert, but there are levels of expertise that can be developed in less time.

Describe what would happen if, while wearing rollerskates, you pushed as hard as you could against a wall. Why does this happen?

If, while wearing rollerskates, a person pushed against a wall as hard as he or she could, the force of the push would be opposed by the force of the wall pushing back against the pusher. Because the wall is solid and grounded, and the pusher is wearing roller skates, the pusher would end up rolling in the direction opposite to the force of the push.

Describe the four main types of resistance forces.

The four main resistance forces are objects with mass, inertia, and momentum; friction; gravity; and air resistance. Objects with mass are able to provide resistance by colliding with other objects. Friction slows objects down by providing a steady resistance when the objects are in contact with and rubbing against a surface. Gravity provides a steady downward pull towards the center of Earth's mass. Air resistance is the cumulative force provided by millions of oxygen atoms being displaced.