WorksheetsPhysics Work and Energy Quiz
Total questions: 15
Worksheet time: 5mins
How much work is done on a 200-kg crate that is hoisted 2 m in a time of 4 s?
400 J
1000 J
1600 J
4000 J
How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?
400 W
1000 W
1600 W
4000 W
When work is done twice as quickly, then the power expended is
half.
the same.
twice.
4 times as much.
If a charging elephant has kinetic energy, it must also have
potential energy.
momentum.
work.
All of these.
When an increase in speed doubles, its kinetic energy
increases, but less than doubles.
doubles.
more than doubles.
depends on factors not stated.
A dog and a mouse run down the road with the same KE. The faster moving one is the
dog.
mouse.
Both run at the same speed.
Can't say.
When a car is braked to a stop, unless it is a hybrid, its kinetic energy is transformed to
stopping energy.
potential energy.
energy of motion.
heat.
When two identical cars, one traveling twice as fast as the other, brake to a stop using old-fashioned brakes, the faster car will skid
the same distance.
twice as far.
4 times as far.
more than 4 times as far.
Which of the following equations is most directly useful for solving a problem that asks for the distance a speeding vehicle skids in coming to a stop?
F = ma
Ft = Δ(mv)
KE = 1/2 mv²
Fd = Δ(1/2 mv²)
A shiny sports car at the top of a vertical cliff has a potential energy of 100 MJ relative to the ground below. Unfortunately, a mishap occurs and it falls over the edge. When it is halfway to the ground, its kinetic energy is
25 MJ.
50 MJ.
about 100 MJ.
more than 100 MJ.
A pendulum bob swings to and fro. Its kinetic energy and its potential energy relative to the bottom of its swing are the same at
the bottom.
one-quarter the vertical distance between the bottom and top of the swing.
one-half the vertical distance between the bottom and the top of the swing.
the top of the swing.
Is it possible to do work on an object that remains at rest?
yes
no
A box is being pulled across a rough floor at a constant speed. What can you say about the work done by friction?
friction does no work at all
friction does negative work
friction does positive work
In a baseball game, the catcher stops a 90-mph pitch. What can you say about the work done by the catcher on the ball?
catcher has done positive work
catcher has done negative work
catcher has done zero work
You lift a book with your hand in such a way that it moves up at constant speed. While it is moving, what is the total work done on the book?
mg × Δr
F_HAND × Δr
(F_HAND + mg) × Δr
zero
none of the above
