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WorksheetsWork, Power, & Energy Practice
Total questions: 42
Worksheet time: 2hrs 19mins
What are the two necessary conditions for work to be done?
Force and Velocity
Force and Displacement
Force and Time
What is the unit for work?
Joules
Newton
Watts
Which of the given pictures shows that work can not be done?
Which number is representing work?
62 m
31 J
80 N
12 J/s
Bob (80 kg) uses 180 N of force to get him up the slope. The vertical distance is 2 m and the diagonal is 10 m. Calculate the work he does.
1600 J
160 J
3600 J
1800 J
Is this an example of work in the vertical direction?
A waiter carries a tray full of meals above his head by one arm straight across the room at constant speed.
An 80 N rope tension force is used to slowly pull a wagon 50 m up a hill. Calculate the work done by the rope if it pulls parallel to the hill
-4000 J
4000 J
A crane lifts an 8-m long steel girder weighing 2600 N up 15 m off the ground. The crane did ___ of work in the vertical direction.
0 J
39000 J
20800 J
2600 J
For work to be done, the force needs to act in the same direction as the motion.
TRUE
FALSE
A 40-kg person is climbing 3 m up a flight of stairs in 6 seconds. How much work did they do climbing the stairs? The acceleration due to gravity is 9.8 m/s^2
400 J
1200 J
200 J
120 J
What has to happen when an unbalanced force is exerted on an object for work to be done?
What needs to be true for Work to be done?
A balanced force causes motion
An Unbalanced force is applied perpendicular to the motion
An Unbalanced force is applied parallel to the motion
A force is not needed for work to be done.
710 J of work are done to lift a box from the floor to the top shelf at the store. If the distance it traveled is 2.1m, what was the force applied?
1491N
338 N
1491J
338 J
What is the distance a box travels if a 99N force is applied and 1456 J of work done?
144144 m
14.7 m
14.7 N
144144 N
How much work was done if 78N of force is applied over a distance of 32m?
2.44 W
2.44 J
2496 W
2496 J
If you have a 40N force to the left, what is the amount of work done on an object if there is also an 40 N force to the right.
1600 J
1 J
0 J
If the person on the left has a force of 3N and the person on the right has a force of 5N is there work being done?
Yes- but the box doesn't move
Yes and the box moves to the left
No and the box doesn't move
No but the box moves to the left
Energy is...
How fast you lift something.
The ability to do work.
How fast you do something.
Confusing
Elli finds that she has 3000 J of work to run up 6m of stairs.
How much POWER is generated by Elli if it took her 5 seconds to run up a flight of stairs?
60 W
62 W
1500 W
600 W
9.8 m/s^2
42 m/s^2
A Ashton raises a 2,000 N bag of cement from the floor to over his head (2.0 meters) in 4 seconds. What is his average power input?
Potential energy is associated with ---.
speed
position
direction
temperature
Kinetic energy is associated with ---.
speed
position
direction
temperature
Which of the following statements show kinetic energy?
The battery of a lit flashlight
A golf ball placed at the edge of the hole
A river flowing down a hill
The more mass an object has, the ________ kinetic energy it has.
You move a 0.8 kg object five meters in 4 seconds. How much power have you generated?
160 watts
10 watts
6.4 watts
17 watts
Which of these has the most potential energy.
A
B
C
D
In order to have momentum, the object must be
commanded by Ms. Stensland
Sitting still
in Motion
have a lot of mass
If a car has a mass of 30kg and a speed of 2 m/s what is it's momentum?
15 kgm/s
60 kgm/s
32 kgm/s
28kgm/s
If two cars are both traveling at 15 mph, but car A has a mass of 100kg and car B has a mass of 200kg, How do their momentums compare?
Car A > Car B
Car B > Car A
Car A = Car B
Not enough information
If two cars have the same mass of 10kg, but car A has a speed of 2m/s and car B has a speed of 1m/s, How do their momentum's compare?
Car A > Car B
Car B > Car A
Car A = Car B
Not enough information
The Conservation of Momentum Law states:
The initial must be larger than the final.
The final must be larger than the initial.
The initial and the final must be the same.
They are both zero.
The Conservation of Energy Law states:
The initial must be larger than the final.
The final must be larger than the initial.
The initial and the final must be the same.
They are both zero.
The Conservation of Energy Law states:
What we start with has to be the same as what we end with
What we start with must be less than what we end with.
What we start with must be greater than what we end with.
They are both zero.
