WorksheetsWork, Energy and Power
Total questions: 25
Worksheet time: 35mins
Which of the following is NOT an example of work?
a boy riding a bicycle on the street
a student walking up a flight of stairs
the teacher opens the door of the classroom
someone pushing on a wall of a room in a building
Which of the following statements is NOT true about work?
Work is a form of energy.
A kg*m2/s2 would be a unit of work.
Watt is a standard metric unit of work.
Unit of work would be equivalent to a Newton-meter.
A ball tied to a string is being whirled around in a circle. What can you say about the work done by tension on the string?
tension does no work at all
tension does negative work
tension does positive work
tension does maximum work
Near the end of the shockwave ride, a braking system exerts an applied force upon the coaster car to bring it to a stop. Determine the work of the indicated force.
No Work
Positive Work
Negative Work
Maximum Work
In which situation is there work done on the system?
a basket being lifted
a weightlifter holding a barbell in the air
a waiter carrying the order of the customer
a man carrying a bag of cement on his shoulder
What can be said about the total energy in the universe?
It tends to decrease.
It tends to increase.
It is always zero.
It is conserved.
What type of energy is illustrated in the position of molecules and electric charges are being altered in using fuel?
Kinetic energy
Chemical energy
Potential energy
Mechanical energy
What form of energy is present when a bow of an archer is drawn back?
Kinetic energy
Chemical energy
Potential energy
Mechanical energy
Which of the following possesses elastic energy?
heating water
throwing football
winding the mainspring of a clock
bicycle coasting along a level road
How much work is necessary to double the speed of a moving object?
zero work
same work
twice the work done
four times the work done
Which of the following is NOT a measure of power?
Joule per second
Newtown meter per second
Kilogram meter per second
Kilogram meter squared per second squared
What power will be delivered in a constant amount of work if the time interval is doubled?
doubled
decreased by half
remains the same
decreased by one-fourth
In a marathon, the winner and the runner-up have the same mass. Compared with the runner-up, the winner has more _______________.
energy
force
power
work
Which of the following quantities and units are INCORRECTLY paired?
work and joule
power and watt
energy and watt
force and newton
Raising an auto in a service station requires work. Raising it in half the time requires _______________.
half the power
twice the power
the same power
four times the power
How much work is done when two workers lift a 500-N bag of cement to platform 1.5-m high?
3 x 10-3 J
333.33 J
750 J
1500 J
If 2.0 J of work is done in raising a 180 g apple, how far is it lifted? (Use g = 9.8 m/s2.)
1.11 x 10-2 m
1.13 m
11.11 m
90 m
A 6.0-kg cat runs after the mouse at 10.0 m/s. What is the cat’s kinetic energy?
30 J
60 J
300 J
600 J
Two horses pull a cart. Each exerts a force of 250.0 N at a speed of 2.0 m/s for 10.0 min. Calculate the power delivered by the horses?
0.5 kW
1 kW
5 kW
10 kW
A student with a mass of 66.0 kg climbs a staircase in 44.0 s. If the distance between the base and the top of the staircase is 14.0 m, how much power will the student deliver by climbing the stairs? (Use g = 9.8 m/s2.)
21 W
36 W
124 W
206 W
Richard pulls a toy 3.0 m across the floor by a string, applying a force of 0.50 N. During the first meter, the string is parallel to the floor. In the next two meters, the string makes an angle of 30o with the horizontal direction. What is the total amount of work done by Richard on the toy?
1.000 J
1.299 J
1.366 J
1.500 J
A student slides a 0.75 kg textbook across a table, and it comes to rest after traveling 1.2 m. Using the work-energy theorem, what is the book’s initial speed? (Use g = 9.8 m/s2.)
4.85 m/s
3.96 m/s
2.97 m/s
2.47 m/s
A 50.0 kg student climbs 5.00 m up a rope at a constant speed. If the student’s power output is 200.0 W, how long does it take the student to climbs the rope? (Use g = 9.8 m/s2.)
1.25 s
3.64 s
12.25 s
24.5 s
Martinus Kuiper of the Netherlands ice skated for 24 h with an average speed of 6.3 m/s. Suppose Kuiper’s mass was 65 kg. If Kuiper provided 520 W of power to accelerate for 2.5 s, how much work did he do? (Use g = 9.8 m/s2.)
1300 J
3276 J
4013 J
12480 J
How high is a-3.00 kg object that has 300 J of energy? (Use g = 9.8 m/s2.)
10 m
10.2 m
30.61 m
100 m
