This is what the law of conservation of energy states.
What is energy can neither be created nor destroyed?
100
This is the largest source of nuclear energy on Earth.
What is the sun?
100
What is the best way to increase the efficiency of a machine?
What is reduce the friction?
200
The energy of motion.
What is kinetic energy.
200
The average kinetic energy of the particles in a substance.
What is temperature?
200
This is the conversion that happens in plants.
What is nuclear energy to chemical energy?
200
Energy stored in the bonds between atoms.
What is chemical energy?
200
In an ideal machine, this equals work output.
What is work input?
300
As this energy decreases, this energy increases.
What is potential energy and kinetic energy?
300
This is a material that moves thermal energy well.
What is a thermal conductor? NOTE: usually contains free electrons!
300
Can energy conversions be 100% efficient? Why or why not?
What is no because of waste heat due to friction?
300
This is an example of elastic potential energy.
What is a compressed spring or a stretched rubber band?
300
Do ideal machines exist? Why or why not?
What is no because all machines lose some efficiency due to friction producing waste heat.
400
If a 5 kg book is sitting on a 3 m shelf, this is its potential energy.
What is 147 J?
400
This is why conduction is slower in gases than in solids.
What is the atoms are further apart?
400
If there is 100 J out in electromagnetic energy, 150 J out in mechanical energy, and 100 J out in waste heat, what was the energy input?
What is 350 J?
400
Name the 7 types of electromagnetic waves.
What are gamma rays, x-rays, UV rays, visible light, infrared rays, microwaves, and radio waves?
400
In a machine that is 35% efficient, this is what happens to the other 65%.
What is it is unusable heat due to friction.
500
If a 4 kg ball is rolling at 4 m/s, this is its kinetic energy.
What is 32 J?
500
This gets hotter after one minute in the sun, a plastic chair with a specific heat of 0.6 J/(g•⁰C) or a wood chair with a specific heat of 0.4 J/(g•⁰C).
What is a wood chair?
500
The efficiency of the following hair dryer: 100 J in, 30 J out as usable heat energy, 30 J out as mechanical energy, the balance out as unusable heat energy.
What is 60%?
500
Name the 5 forms of energy.
What are nuclear, chemical, electromagnetic, mechanical, and thermal energy?
500
According to scientists, work is the product of these two things.