Work
This is the formula for work
W=Fd
This is the energy of motion.
Kinetic Energy (KE)
In an LOL diagram, the "L"s represent these two things.
Initial and Final states
Power is defined as the work done over a certain period of __________.
time
In the elastic potential energy equation, what does the “x” represent?
Distance the spring is stretched or compressed
If you push a car with 500 N of force but the car doesn’t move, this is the amount of work you have done.
0 Joules
This is the energy stored in a compressed spring or a stretched rubber band.
Elastic Potential Energy (PEs)
In a "Perfect World" system with no friction, the total number of bars must __________ from start to finish.
Remain constant / Stay the same
The unit for Power, which equals 1 Joule per second.
Watt
If you double the compression of a spring, the energy increases this many times.
4 times, because x is squared
This is the unit used to measure Work.
Joules
This is what the "g" stands for in the Potential Energy equation.
gravitational constant = 9.8 m/s^2
Identify the energy trade: A ball is dropped from a roof and is currently halfway down.
PEg to KE
If Person A and Person B do the same work, but Person A is faster, this person has more power.
Person A
This value (k) tells you how "stiff" or "strong" a spring is.
spring constant
Calculate the work done to lift a 10 kg box 2 meters high
196 J
Calculate the Kinetic Energy of a 2 kg ball moving at 4 m/s.
16 J
Identify the energy trade: A child pushes down on a pogo stick spring before jumping.
KE to PEs
Calculate the power of a motor that does 500 J of work in 5 seconds.
100 W
Calculate the energy in a spring where k = 100 N/m and x = 0.5 m.
12.5 J
True or False: Carrying a heavy box across a flat room at a constant speed is considered "Physics Work."
False—force is up, motion is sideways
A 100 kg boulder sits on a 10 m cliff. Calculate the PEg.
9,800 J
If a system has 40 J of PEg at the top of a hill, this is how much KE will it have at the bottom if there is no friction.
40 J
A student with a weight of 500 N climbs a 4 m ladder in 10 s. Calculate the power.
200 W
To make a Mousetrap car go faster (more Power), should the spring release its energy in a _________ amount of time.
Short