Work & Power
Power is divided by time so that also makes it a ____
Rate
How many forms of energy did we discuss?
Machines do ____
Work
What term matches the following definition:
What gives us the ability to do work
Energy
Storms clouds have (kinetic or potential) electrical energy because they store positive and negative charges
Potential
Physics defines Work as _____ times ________
Force times distance
What are the two forms of energy we discussed?
Kinetic and Potential
What are the two main equations for mechanical advantage?
MA = Fo/Fi
MA = di/do
What term matches the following definition:
change in momentum (F x t)
What type of energy is stored in a battery? (Two answers)
To convert Watts into Horsepower, you must divide by what number?
746
Calculate the potential energy for a 24 kg object that is 7 m above the ground.
1,680 J
What are the three simples machines we discussed in class?
What is the unit for energy?
Joules (J)
To convert Pounds (lbs) to Newtons (N), you need to multiply the pounds by what number?
4.45
If 500 J of work is done in 0.25 seconds. What's the power?
2,000 W
196 J
When you push a lever down 18 cm, the other end goes up 6 cm. What is this machine's mechanical advatnage?
3
What vocab word would you use to describe when someone or something is glowing
Radiant
Song
Name and/or Artist
Stairs problem:
If Jake used 300 N to go up 7 m tall stairs in 3 seconds, how much power did Jake use?
700 W
What is the TOTAL energy of a 4 kg object that is going 18 m/s at 13 m above the ground?
1,168 J
If there is an input of 248 J and a machine only outputs 62 J of work, what is the efficiency?
25%
What vocab word best fills in the blank in the sentence:
The pulley did work to _______ the weight up from the surface of the table.
Elevate
Which of the three simple machines did we not do a lab on?
Levers