Work and Power
Work/Power . Calculations
Kinetic Energy
Calculations
Potential Energy
100
What is the formula for work?
W= FxD
100
How much work is done on a small car if a 3150 N force is exerted to move it 75.5 m to the side of the road?
237,825 J
100
What is the formula Kinetic Energy?
1/2 mass x velocity^2
100
The kinetic energy of a soccer ball with a mass of 2 KG and traveling at 4 m/s
What is 16 J
100
At which position on the diagram would an apple have the greatest potential energy?
Position 1
200
What is the formula for power?
p=W/t
200
A crate is being lifted into a truck. If it is moved with a 2470 N force and 3650 J of work is done, then how far is the crate being lifted?
1.48 m
200
What does kinetic energy depend on?
mass and velocity
200
A 100 W light bulb was lit for 2 hrs. How much work was done
What is 720,000 J
200
potential energy is the energy of an object being __________.
stored
300
____ is when a force acts on an object to cause displacement of the object.
work
300
A lawnmower engine running for 20 minutes does 4,560,000 J of work. What is the power output of the engine?
228,000 w
300
Which of these has the LEAST kinetic energy?
a. house
b. a speeding car
c. a bike coasting down a hill
d. a person jumping on a trampoline
a house
300
Using a force of 100 N a box is pushed 22.5 m. How much work was done?
What is 2250 J
300
What is the formula for calculating Gravitational Potential Energy?
mass x gravity x height
400
_____ is the amount of time in which work is done.
power
400
Sierra did 500 J of work to move her couch. If she exerts 250 N of force on the couch, how far did she move it?
2m
400
Which point (s) show maximum kinetic energy?
C
400
A 4,440 w motor is used to do work. If the motor is used for 200s, how much work could it do?
888,000 J
400
What does potential energy depend on?
Height and Weight
500
Is this actual “work”? 
No. The wall is not moving.
500
How much time is needed for a 15,000 W engine to do 1,800,000 J of work?
120 s
500
Which point(s) show increasing kinetic energy?
B
500
A book with a mass of 5 Kg is held out a window that is 15 m high. What is the gravitational potential energy of the book?
What is 735 J
500
As a ball bounces (in real life), what happens to the total amount of energy?
Some energy gets transferred to the air and floor, so the ball doesn't bounce as high