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WorksheetsWork & Energy Test Review
Total questions: 31
Worksheet time: 34mins
In which of the following is no work done?
climbing stairs
lifting a book
pushing a shopping cart
none of these
If you exert a force of 10.0 N to lift a box a distance of 0.9 m, how much work do you do?
0.1 J
9.0 J
10.9 J
90.0 J
The SI unit of power is the
joule.
newton.
newton-meter.
watt.
If you exert a force of 600 N to walk 6 m up a flight of stairs in 6 s, how much power do you use?
19 W
25,200 W
600 W
3600 W
A 750-W motor might also be rated as a
0.5-horsepower motor.
1-horsepower motor.
2-horsepower motor.
10-horsepower motor
A machine is a device that can multiply
force.
power.
work.
all of these.
How can a machine make work easier for you?
by decreasing the amount of work you do
by changing the direction of your force
by increasing the work done by the machine
none of these
If you know the input distance and output distance of a machine, which of the following can you calculate?
work
actual mechanical advantage
efficiency
ideal mechanical advantage
A 120-m long ski lift carries skiers from a station at the foot of a slope to a second station 30 m above. What is the IMA of the lift?
0.4
4
30
150
Reducing friction in a machine
decreases its actual mechanical advantage.
decreases the work output.
increases its efficiency.
increases its ideal mechanical advantage.
A motor with an efficiency of 80 percent must supply 240 J of useful work. What amount of work must be supplied to the motor?
80 J
192 J
288 J
420 J
Work is a transfer of
energy
force.
mass.
motion.
A small 30-kilogram canoe is floating downriver at a speed of 2 m/s. What is the canoe’s kinetic energy?
32 J
60 J
80 J
400 J
Which of the following is an example of an object with elastic potential energy?
a wind-up toy that has been wound up
a compressed basketball
a stretched rubber band
all of these
A 5-kilogram cat is resting on top of a bookshelf that is 3 meters high. What is the cat’s gravitational potential energy relative to the floor if the acceleration due to gravity is 9.8 m/s2?
8 J
15 J
29 J
147 J
The energy stored in gasoline is
chemical energy.
electromagnetic energy.
mechanical energy.
nuclear energy.
Nuclear power plants are designed to convert nuclear energy into what type of energy?
chemical
electrical
geothermal
mechanical
The kinetic energy of the pendulum bob in Figure 15-1 increases the most between locations
A & B
B & D
A & C
C & D
The equation E = mc2 relates energy and
force.
gravity.
mass.
work.
A drawback of solar energy is that it
cannot be converted directly into electrical energy.
depends on the climate.
produces water pollution.
is not a renewable resource.
Which of the following types of transportation is NOT mass transportation?
bus
car
streetcar
train
A machine is used to lift boxes in a warehouse. Which change will increase the power of the machine?
decreasing the work done by the machine
decreasing the distance the boxes are lifted
decreasing the force exerted by the machine
decreasing the time it takes to lift the boxes
I you perform 40 joules of work lifting a 10-N box from the floor to a shelf, how high is the shelf?
0.3 m
20 m
4.0 m
400 m
Which of the following statements is true?
To increase power, you can decrease the amount of work you do in a given amount of time, or you can do a given amount of work in more time.
To increase power, you can increase the amount of work you do in a given amount of time, or you can do a given amount of work in less time.
The actual mechanical advantage of a machine
cannot be less than 1.
decreases as the input distance increases.
increases with greater frictional force.
is less than the ideal mechanical advantage of the machine.
If you apply 40 N of force on a crowbar to lift a rock that weights 400 N, what is the actual mechanical advantage of the crowbar?
0.1
10
360
16,000
A 13-kg sled is moving at a speed of 3.0 m/s. At which of the following speeds will the sled have twice as much KE?
1.5 m/s
4.2 m/s
6 m/s
9 m/s
An object's gravitational potential energy is NOT directly related to which of the following?
its height relative to a reference level
its mass
its speed
the acceleration due to gravity
The total potential and kinetic energy of all the microscopic particles in an object make up its
chemical energy.
electric energy.
nuclear energy.
thermal energy.
In which of the following does Einstein's famous equation apply?
a driver brings a car to a halt
collisions between objects
water falling in a waterfall
nuclear fission and fusion reactions
Based on your knowledge of energy conservation, which of the following statements is TRUE?
Manufacters can increas a light bulb's energy efficiency by using technology that increases the amount of electromagnetic energy the bulb converts from a given amount of electrical energy.
Energy can be conserved by turning off lights when they are not in use.
both statements
neither statement
