Law of Conservation of Energy
Potential Energy
Kinetic Energy
Work
Power
100
A Joule is the unit of measurement for all energies.
What two units combine to create a Joule?
Newtons (F) and meters (d)
100
If the ________ of an elevated object is doubled, then its gravitational potential energy will be doubled as well.
Mass
or
Height
100
TRUE OR FALSE?
An object can never have negative kinetic energy?
True
Energy is NOT a vector.
100
Person A and Person B are competing against each other, they both can lift 75 kg boxes 3.5 m off of the ground. Person A lifts her box in 1.5 s and Person B lifts his box in 2.4 s. Which person does more work?
They do the same amount.
100
While he and his family are moving, James drags his suitcase 12.64 m from the front door to the car at a constant speed of 0.43 m/s. He does this with a horizontal force of 87.0 N. If he does all of this within 17 s, how much power has he put out?
65 W
200
A platform diver weighs 500 N. She steps off a diving board that is elevated to a height of 10 meters above the water. How many Joules of kinetic energy will she have when she hits the water?
5000 J
200
What variable does the "extension" represent?
x
how much the spring is stretched or compressed
200
definition of kinetic energy??
What is "moving" energy
200
A cable is attached to a bucket and the force of tension is used to pull the bucket out of a well.
Is this +, -, or 0 work?
positive (+)
200
If Aimee does 5.1 J of work to move her dresser drawer a distance of 2.3 m and all of this is done in 8 s, how much power has been exerted??
0.64 W
300
300
A compressed spring has an elastic potential energy of 18 J. If the spring constant of the spring is 400 N/m, how far was the spring compressed?
0.3 meters
Us = 1/2 kx^2
300
Rank in order from greatest to least KE:
B, C, A
300
An eraser is tied to a string; a person holds the string and applies a tension force as the eraser is moved in a circle at constant speed. This is an example of work being done.
TRUE or FALSE?
False!
The force and the direction of motion are perpendicular.
300
A 60 watt bulb runs for 5 seconds. How much energy does it use?
300 J
400
A 4kg ball is on a ledge that is 5m high. If it's pushed off, how much kinetic energy will it have just before hitting the ground?
200 J
Ug = KE
400
Calculate the spring constant of this spring:
33 N/m
400
A 2.3 kg mass attached to a horizontal spring with spring constant 54 N/m, is released 0.42 m from its equilibrium position. What is the mass' speed as it passes through its equilibrium position?
2 m/s
400
Calculate how much work was done if an object is pulled at an angle of 47 degrees along a 6 m path with a force of 13 N.
What is 53 J
400
You push down on a 30 N box for 10 minutes. How much power was exerted?
0 W
500
A 25 kg ball is thrown into the air, going 10 m/s. calculate how high it travels.
5 meters
500
Draw the energy bar charts for A, B, & C. Image A is when the spring is stretched to its max.
500
k = 100 J
v = 2 m/s
What is the object's mass??
What is 50 kg
500
While he and his family are moving, James drags his suitcase 12.64 m from the front door to the car at a constant speed of 0.43 m/s. He pulls with a force of 87.0 N at an angle of 40 degrees. How much work does he do to over come friction?
842 J
500
Person A and Person B are competing against each other, they both can lift 75 kg boxes 3.5 m off of the ground. Person A lifts her box in 1.5 s and Person B lifts his box in 2.4 s. Which person uses more power?
Person A