WorksheetsRemediation for Work, Power, Energy TEST
Total questions: 24
Worksheet time: 5hrs 2mins
What is the formula for calculating work done when a force is applied to an object?
W=F⋅d⋅cos(θ)
W=m⋅g⋅h
W=21mv2
W=F⋅a
Which of the following is the unit of power?
Joule
Watt
Newton
Pascal
A 5 kg object is lifted to a height of 10 meters. What is the potential energy of the object at this height? (Use g=9.8m/s2 )
49 J
98 J
490 J
980 J
If a spring has a spring constant of 200 N/m and is compressed by 10 cm, what is the elastic potential energy stored in the spring?
0.5 J
1 J
100 J
10,000 J
Which of the following statements best describes the work-kinetic energy theorem?
The work done on an object is equal to the change in its kinetic energy.
The work done on an object is equal to the change in its potential energy.
The work done on an object is equal to the sum of its kinetic and potential energy.
The change in work done on an object is equal to its final kinetic energy
A car accelerates from rest to a speed of 20 m/s in 10 seconds. If the mass of the car is 1000 kg, what is the average power output of the car's engine during this time?
20,000 W
40,000 W
100,000 W
200,000 W
Which of the following is an example of nonmechanical energy?
Kinetic energy
Potential energy
Thermal energy
Elastic potential energy
A 2 kg object is moving with a velocity of 3 m/s. What is its kinetic energy?
3 J
6 J
9 J
18 J
According to Hooke's Law, what is the relationship between the force exerted by a spring and its displacement? (Note: disregard the negative sign showing that the force from the spring is directed in the opposite direction of the applied force.)
F=k⋅x
F=xk
F=k⋅x2
F=21kx2
A roller coaster car of mass 500 kg is at the top of a hill 30 m high. Assuming no friction, what is the speed of the car at the bottom of the hill?
10 m/s
15 m/s
20 m/s
24.3 m/s
What is the primary difference between mechanical and nonmechanical energy?
Mechanical energy is always conserved, while nonmechanical energy is not.
Mechanical energy involves motion or position, while nonmechanical energy involves internal or thermal energy.
Mechanical energy is only kinetic, while nonmechanical energy is only potential.
Mechanical energy is only potential, while nonmechanical energy is only kinetic.
A force of 10 N is applied to move a box 5 meters across a flat, frictionless surface. The force is applied at an angle of 25 degrees to the horizontal. How much work is done on the box by this applied force?
0 J
21.1 J
50 J
45.3 J
Which of the following best describes the conservation of energy principle?
Energy can be created or destroyed, but not transformed.
Energy can be transformed from one form to another, but the total energy remains constant.
Energy can be destroyed, but not created.
Energy can be created, but not destroyed.
A pendulum is released from a height of 2 meters. What is its speed at the lowest point of its swing?
2 m/s
4 m/s
6.26 m/s
8 m/s
If a machine that is only 75% efficient does 500 J of work in 10 seconds, what is its power output?
66.7 W
50 W
500 W
37.5 W
Which of the following is an example of kinetic energy?
A compressed spring
A moving car
A book on a shelf
A stretched rubber band
A spring with a spring constant of 150 N/m is stretched 20 cm to the right. What is the force exerted by the spring?
-30 N
30 N
3,000 N
3 N
A 10 kg object is dropped from a height of 5 meters. What is its speed when it is 2 m above the ground? (Ignore air resistance)
5 m/s
7.7 m/s
9.9 m/s
14 m/s
What is the relationship between work and energy?
Work is the rate at which energy is used.
Work is the energy transferred to or from an object via the application of force along a displacement.
Work is the energy stored in an object due to its position.
Work is the energy an object has due to its motion.
A 1000 kg car is traveling at a speed of 30 m/s. The driver hits the brakes, reducing the speed to 10 m/s. This happens over a distance of 80 m. What was the force applied by the brakes?
-400,000 N
-5,000 N
-32,000,000 N
0 N
Which of the following best describes the concept of power in physics?
The total energy of an object.
The rate at which work is done.
The force applied to an object.
The potential energy stored in an object.
How much work was done in moving the object 5 m?
3 J
6 J
0 J
10.5 J
A laptop is slid across a desk at a constant speed. There is friction. Which force does negative work on the laptop?
applied force
gravity
normal force
friction
Two identical objects are rolling down a hill. Object A reaches the bottom traveling 2.0 m/s. Object B reached the bottom traveling 8.0 m/s. What is true regarding their kinetic energies at the bottom of the hill?
Object B has 4x the KE of object A
Object B has 8x the KE of object A
Object B has 16x the KE of object A
They have the same KE
