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100
Any device that makes work easier by changing a force.
What is a machine?
100
A simple machine that consists of an inclined plane wrapped around a cylinder or cone.
What is a screw?
100
The percent of input work that becomes output work.
What is efficiency?
100
Jack pushed a 500 N box 4 meters across the floor. How much work did he do?
What is 2000 N/m or 2000J?
100
Assume that Alex has a small engine that does 3000J of work in 2 seconds. What is the power of the motor?
What is 1500 J/s or 1500 W?
200
If Paige uses a 2000W hair dryer for 30 seconds, how much work is done?
What is 60,000J?
200
Matthew put 10,000J of work into a car jack. The car jack, in turn, puts out 7,000J of work to raise up the car. What is the efficiency of the jack?
What is 70%?
200
The transfer of thermal energy by particles moving through a fluid.
What is convection?
200
Stored energy an object has because of its position or shape.
What is potential energy?
200
The transfer of thermal energy between objects that have different temperatures.
What is heat?
300
Process in which energy changes from one type or form to another.
What is energy conversion?
300
The transfer of thermal energy between particles of matter that are touching.
What is conduction?
300
Total kinetic energy of all the atoms that make up an object.
What is thermal energy?
300
Saving resources by using them more efficiently or not using them at all.
What is conservation?
300
A complex machine that burns fuel to produce thermal energy and uses the thermal energy to do work.
What is a combustion engine?
400
Material that is a poor conductor of thermal energy.
What is a thermal insulator?
400
Material that is a good conductor or thermal energy.
What is a thermal conductor?
400
Flow of particles in a fluid that occurs because of differences in temperature and density.
What is a convection current?
400
Energy of moving electrons.
What is electrical energy?
400
Energy of an object that is moving or has the potential to move; calculated as the sum of an object's kinetic and potential energy.
What is mechanical energy?
500
Energy that travels in waves through matter from a vibrating object.
What is sound energy?
500
Amount of energy (in joules) needed to raise the temperature of 1 kilogram of a substance by 1*C.
What is specific heat?
500
Anything people can use that comes from nature.
What is a natural resource?
500
Substance with a low boiling point that is used to transfer thermal energy in a cooling system such as a refrigerator.
What is refrigerant?
500
Energy that is stored in the bonds between atoms that make up compounds.
What is chemical energy?