WorksheetsMechanical Energy, Work and Power
Total questions: 56
Worksheet time: 1hrs 8mins
What is the sum of kinetic energy and potential energy of a system?
mechanical energy
electrical energy
moving energy
nuclear energy
Where does the pendulum have the greatest kinetic energy?
A
B
C
D
E
Where does the pendulum have the least amount of potential energy?
A
B
C
D
E
Where does the pendulum have the greatest potential energy? (pick 2)
A
B
C
D
E
Where is potential energy at its maximum?
a
b
c
d
Where is kinetic energy at its maximum?
a
b
c
d
What is the kinetic energy at W, where the car is stopped?
0J
10,000J
20,000J
can not be determined
What is the mechanical energy of the system? (ignore friction)
0J
10,000J
20,000J
can not be determined
What is the kinetic energy at position X? (ignore friction)
0J
1,000J
19,000J
can not be determined
What is the kinetic energy at position Y? (ignore friction)
0J
10,000J
20,000J
can not be determined
Q. What does the Law of Conservation of Energy state?
Energy can be created but not destroyed.
Energy can be created and destroyed.
Energy cannot be created but can be destroyed
Energy cannot be created or destroyed.
Q. What has to be true about an object for it to have kinetic energy?
it must be moving
it must be experiencing a net force
it must be elevated
it must be accelerating
When does an object have no kinetic energy?
when it is moving very slowly
when it has no electrical charge
when the only force that is acting on it is gravity
when it is at rest
You calculated PE at 1960 J and your KE at 225 J. What is your Total Mechanical Energy? Select the Equation you should use.
PE = mgh
KE = 1/2 (m) (v^2)
W=fd
TME = KE + PE
You calculated PE at 1960 J and your KE at 225 J. What is your Total Mechanical Energy?
225 J
3150 J
2185 J
1960 J
Which of the is the equation for calculating work?
W = Fd
W = ma
W = mv
W = mc2
Work is defined as applying a force on an object that displaces the object in the direction of the applied force. Which of the following IS NOT an an example of work being done on an object?
A waiter walking with a tray of food that he is holding with his hand under the tray.
A horse pulling a plow through a field.
A shopper pushing a cart down the aisle of a grocery sture.
A weightlifter lifting a barbell above his head.
Which of the following is an instance where a force is in the opposite direction of the displacement.
A car skidding to a stop on a roadway surface.
A student rolling a bowling ball down a bowling lane alley.
A pitcher throwing a baseball.
a man pushing a crate across a loading dock.
An instance where a force is appiled in the opposite direction of a displacement is called __________________ work.
negative
false
faux
opposite
If a ball tossed into the air has a maximum gravitational potential energy of 5.75 joules, what is its maximum kinetic energy in the same toss?
5.75 joules
11.14 joules
2.88 joules
7.93 joules
What is the mechanical energy of the roller coaster car?
100 joules
50 joules
2500 joules
1 joule
This drawing illustrates which of the following?
Conservation of Mechanical Energy
Conservation of Mass
Conservation of Momentum
Universal Gravitation
How much work is being done with 200 N of force to the right on object that moves 426 meters to the right? (assume the force and displacement are in the same direction)
85,200 J
45,620 J
90,480 J
62,329 J
You push against the back of your friends car that is stuck. You push and be become very tired, but the car does not move. Did you do work?
Yes, work was done
No, work wasn't done
Person A and Person B are both using the same amount of work to lift something. Person A takes half as much time to do it. Who has greater power.
Person A
Person B
Which of the following is the best example of work being done.
doing homework
lifting a box
pushing a stationary box
holding a box
W=5000 Joules
t=???
A 8.6 kg box is pushed across a floor 3.2 m with a force of 5.5 N. How much work is done on the box?
17.6 J
8.7 J
1.72 J
No work is done.
A student carries a 10.5 kg book bag 15.3 m. How much work is done on the book bag by the student?
No work is done.
160.65 J
1.46 J
25.8 J
An object of mass 6.8 kg is lifted to a height of 1.3 m. How much work is done on the object?
8.84 J
8.1 J
5.23 J
No work is done.
If the direction an object is displaced is the same as the direction of a force applied to it:
Positive work is done.
Negative work is done.
No work is done.
If the direction of an applied force is anti-parallel (opposite) to the direction an object is moving:
Negative work is done.
Positive work is done.
No work is done.
If the direction an object is displaced is perpendicular to the direction of a force applied to it:
No work is done.
Positive work is done.
Negative work is done.
How much power is required to do 40.2 J of work in 3.3 s?
12.18 W
132.66 W
43.5 W
0.08 W
In order to do 20.5 J of work in 0.46 s, how much power is required?
44.57 W
9.43 W
32.35 W
11.56 W
A force of 4.6 N moves a 2.7 kg box a distance of 3.3 m in 6.8 s. How much power is exerted?
2.23 W
6.03 W
17.4 W
278.7 W
How much work is done when 114 W of power is used over 0.62 s?
70.68 J
183.87 J
57.62 J
No work is done.
The roller coaster car has a mass of 500 kg. It is pulled from position 1 to 2 (30 m) by a motor. At the top of the ride the vertical distance top to bottom is 20 m. The motor pulls the car with a 4000 N force. Calculate the work done getting the car to the top of the ride.
100 000J
120 000J
800 000J
90 000J
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
How high up is a 3200-kg plane if it has 960000 J of potential energy?
10 m
30 m
307200000 m
300 m
