An applied force F accelerates an object of mass m on a horizontal frictionless surface, from velocity v to velocity 2v.
The net work done on the object is equal to:
work energy and power grade 12
Quiz
•
Science
•
12th Grade
•
Hard
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20 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 5 pts
An applied force F accelerates an object of mass m on a horizontal frictionless surface, from velocity v to velocity 2v.
The net work done on the object is equal to:
2.
MULTIPLE CHOICE QUESTION
45 sec • 5 pts
If air resistance is negligible, the total mechanical energy of a free-falling body…
decreases
becomes zero
3.
MULTIPLE CHOICE QUESTION
45 sec • 5 pts
The engine of a car does work, W, to increase the velocity of the car from 0 to v.
The work done by the engine to increase the velocity from v to 2v is…
4.
MULTIPLE CHOICE QUESTION
45 sec • 5 pts
Power is defined as the rate …
as the rate at which work is done or energy is expended
5.
MULTIPLE CHOICE QUESTION
45 sec • 5 pts
A car moves up a hill at constant speed. Which one of the following represents the work
done by the weight of the car as it moves up the hill?
ΔEk
-ΔEk
ΔEp
-ΔEp
Answer explanation
the weight of the car pulls the car down, working in the direction opposite to motion, i.e. negative work is done by the weight of the car. Since it moves up the hill at constant speed, there is no change in the kinetic energy of the car. It is the potential energy that changes. The car’s motor must do positive work to overcome the negative work of the car’s weight
6.
MULTIPLE CHOICE QUESTION
45 sec • 5 pts
An object moves in a straight line on a rough horizontal surface. If the net work done on the object is zero, then…
the object has zero kinetic energy.
the object moves at constant speed.
the object moves at constant acceleration.
there is no frictional force acting on the object.
Answer explanation
Wnet = ΔEk, so if the net work is zero, there cannot be a change in kinetic energy. Thus, the object moves with constant speed
7.
MULTIPLE CHOICE QUESTION
45 sec • 5 pts
A diver dives from a diving board into a swimming pool.
Which one of the following graphs represents his gravitational potential energy versus the time from the moment the diver leaves the diving board until just before he enters the water? Ignore the effects of friction.
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