Vocab
Potential Energy
Kinetic Energy
Conservation of Energy
Misc
100
What is the unit of Energy and Work?
The Joule
100
What is the potential energy of a of a car moving at a velocity of 20 m/s
Ep = 0 , on ground level
100
What is the Kinetic energy of a 29,000 kg F-22 fighter jet waiting on an aircraft carrier?
Ek = 0
100
True or False? The Total Energy in a closed system is the same everywhere.
True
100
If you double the work done in the same amount of time, what happens to your power?
Power Doubles
200
What is the energy of position / stored energy
Potential Energy
200
What is the potential energy of a 5 kg rock on a cliff 5 meters up? (use g = 10 m/s^2 for simplicity)
Ep = 250 J
200
What is the Kinetic Energy of a 0.5 kg rock being slung at a velocity of 10 m/s?
25 Joules
200
You are standing on the roof of MHS dropping water balloons onto passers by. holding the 1 kg water balloon on the roof, it has a potential energy of roughly 44 Joules. How much kinetic energy does it have when you miss Mr. Sasso and it hits the ground?
44 Joules
200
If Meaghan pulls with all her might on Mark, but he does not move, does she do work?
No
300
The total energy in a closed system
Total Mechanical Energy
300
At what height is the 1 kg remote control resting if it has a potential energy of 20 J? (use g = 10 m/s^2 for simplicity)
h = 2 meters
300
An object has a kinetic energy 1000 J and a mass of 5 kg, how fast is this object moving?
20 m/s
300
In real life there is Friction on amusement park rides. What is the sign of the work done by Friction and what does this do to the Total Energy in the System?
Work done by friction is negative, takes energy away from the system.
300
Use the Image, at what point will the ball be moving the fastest? http://www.fearofphysics.com/Probs/mech056.html
Point D
400
What is the energy of motion
Kinetic Energy
400
What is the weight of a TV that is resting at a height of 1.5 meters and has a potential energy of 52.5 Joules
35 N
400
A meteor is entering Earth's atmosphere and splits in half. If it originally had a kinetic energy of 4000 J, what is its new kinetic energy?
2000 J
400
A 2 kg rock initially at rest has 400 J of potential energy while at the top of a cliff, what is the rock's velocity as it hits the ground?
20 m/s
400
Jessica and Maryam are both lifting up their books of mass 5 kg up the senior steps of height 2.5 meters. Jessica does this in 15 seconds and Maryam does this in 13 seconds. Who does More Work?
Neither, they both do the same. Time does not affect work done.
500
Which has a different unit: Work, Power, Energy
Power
500
An object has a potential energy of 20 Joules, if the object were lowered to a quarter of its original height what is the new potential energy?
5 Joules
500
A paper airplane has a kinetic energy of 0.5 J moving at a speed of 4 m/s. If it caught a gust of wind and doubled its speed, what is its new kinetic energy?
2 Joules
500
Use Image and Link to Solve: A 10 Kg coaster is starting from rest at a height of 15 meters. If it is moving with a velocity of 10 m/s at point A, what is its height? http://www.fearofphysics.com/Probs/mech057fig01.jpg
9.9 meters
500
What energy Conversions are involved in Nuclear Power in order for you to be able to use it to power your laptop? Example: Chemical --> Heat --> etc....
Nuclear ---> Heat ---> Mechanical ---> Electrical
M
e
n
u