Why does the force of gravity do no work on a bowling ball rolling along a bowling alley?
What will be an ideal response?
Work is done on an object only when a force, or some component of a force, acts in the direction of motion of the object. In the case of the bowling ball, the force of gravity is perpendicular to the motion with no component parallel to the alley. (We will see later that, for the same reason, the force of gravity does no work on satellites in circular orbit.)
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a) color b) magnetism c) hardness d) prettiness
Using the hydrologic equation, what would you do to a river if you wanted to prevent flooding?
What will be an ideal response?
Plastics in the sea are a hazard to marine life because ________.
A. they ensnare animals B. they are eaten by animals C. they ensnare animals and they are eaten by animals D. their colors confuse animals E. they ensnare animals, they are eaten by animals, and their colors confuse animals
Calories are a unit of heat measurement.
Answer the following statement true (T) or false (F)