vocab
types of energy
energy conversions
conservation of energy
Energy Problems
100
the ability to do work
What is energy?
100
the energy of motion
What is kinetic energy?
100
a change from one form of energy to another
What is energy conversion?
100
a force that opposes motion
What is friction?
100
How much work is done using a 4N force on an object that moves 56m?
What is 224 Joules?
200
the combination of kinetic and potential energy
What is mechanical energy?
200
mass x speed squared divided by 2
What is the formula to find kinetic energy?
200
Daily Double!!!! energy stored in a stretched rubber band
What is elastic potential energy?
200
energy cannot be created or destroyed
What is the law of conservation of energy?
200
You produce 3400W of power doing 3.4J of work. How long did this take?
What is 0.001s?
300
the energy of position
What is the potential energy?
300
the formula for calculating gravitational potential energy
What is mass x gravity x height?
300
the use of light energy by plants to make new substances that have chemical energy
What is photosynthesis?
300
this is created in every type of energy conversion
What is thermal energy?
300
How much work is required to increase the kinetic energy of a semi by 50,000kJ?
What is 50,000kJ?
400
a kind of lever that can be used to change the direction of a force
What is a pulley?
400
This type of energy is found in the food we eat
What is chemical potential energy?
400
a pedulum changes __ energy into __ energy
What is potential energy into kinetic energy?
400
a comparison of the amount of energy before a conversion and the amount of useful energy after a conversion
What is energy efficiency?
400
How high up must a 2.67kg rock be dropped from to have its PE=1000J?
What is 37.5m?
500
Makes electricity and water
What is a fuel cell?
500
the energy that comes from changes in the mucleus of an atom
What is nuclear energy?
500
a group of objects that transfer energy only to each other
What is a closed system?
500
this is impossible because energy conversions always result in the production of waste energy
What is a perpetual motion machine?
500
A 3kg rock is dropped off a 100m cliff overlooking Lake Superior. What will its velocity be right before it hits the water?
What is 44.7m/s?
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