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
How much force is required to lift a rock a vertical distance of 8 m if 80 J of work were done?
What is 10 N
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
The Law of Conservation of Energy
What is ENERGY CANNOT BE CREATED NOR DESTROYED ONLY TRANSFORMED
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