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A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of ____, but different amounts of ____. Pick the two words which fill in the blanks in their respective order.

A contestant in a winter games event pulls  a 30.0-kg block of ice across a frozen lake with a force of 25 N at 32.0° above the horizontal  and it moves with an acceleration of 0.710 m/s2 to the right. (a) What is the normal force exerted by the lake surface on the block of ice? 

An object weighs 10-Newton  and moves to the left at 1 m/s. Its kinetic energy is approximately ____ Joules.

A sledge (including load) weighs 5000 N. It is pulled on level snow by a dog team exerting a horizontal force on it. The coefficient of kinetic friction between sledge and snow is 0.05. How much work is done by the dog team pulling the sledge 1000m at constant speed?

If the net work done on an object is positive, then the object’s kinetic energy  

A diver who weighs 500 N steps off a diving board that is 10 m above the water. The diver hits the water with kinetic energy of

An ice skater has a moment of inertia of 5.0 kg∙m2 when her arms are outstretched.  At this time she is spinning at 3.0 revolutions per second (rps).  If she pulls in her arms and decreases her moment of inertia to 2.0 kg∙m2, how fast will she be spinning?

On a balanced seesaw, a girl three times as heavy as her partner sits

A bicycle wheel rotates uniformly through 2.0 revolutions in 4.0 s.  What is the frequency of the wheel’s rotation?

Action-reaction forces are