Unit 8 - Energy, Work, and Power Flashcards
Whats the formula for kinetic energy?
1/2mv** (1/2 x mass x volume squared)
whats the formula for gravitational potential energy?
mgh (mass x gravity x height change)
Whats the formula for work done?
fd (force x displacement moved by the force)
or
(weight x vertical distance moved)
what is energy?
the ability of a body to perform work
what is the principle of conservation of energy?
the total energy of a system always remains constant but it can change from 1 form to another
what is kinetic energy?
the energy possessed by moving objects
what is potential energy?
the energy possessed by objects due to their position or configuration
what is gravitational potential energy?
energy possessed by objects due to their height from the surface of the earth
what is elastic potential energy?
energy possessed by objects due to stretch / energy possessed by strained objects
what is electric potential energy?
positive and negative attraction / the energy acquired by the charged particles in electric field
whats the formula for mechanical energy?
KE + (G)PE
what are the 3 types of potential energy?
-gravitational potential energy
-elastic potential energy
-electric potential energy
what is work done equal to?
energy transferred
what is 1 joule?
the energy transferred (work done) by a force of 1N when it moves through a distance of 1m
what is power?
the rate at which energy is transferred, or the rate at which work is done (how fast work is done)
what is efficiency?
how much useful work is done in a given time without wasting much energy
whats the formula for efficiency (energy)
useful work done/total energy input
whats the formula for efficiency (power)
useful power output/total power
whats the formula for useful power output?
force x speed
whats the relationship (triangle) for work done (energy), power, and time?
top: work done (energy)
bottom 2: power and time
whats the unit for power?
watts (W)
1W=?
1J/s
What is renewable fuel?
Fuel that once used, more can grow/be made to replace the used up fuel
What is non renewable fuel?
Fuel that cannot be replaced
What are 2 examples of non renewable energy resources?
Fossil fuels
Nuclear fuels
What are 7 examples of renewable energy resources?
Hydroelectric energy
Tidal energy
Wind energy
Wave energy
Geothermal energy
Solar energy
Biofuels
What are 4 problems for non renewable energy resources?
Supplies are limited
Carbon dioxide pollutes causing global warming
Expensive
Dangerous
What are what are 3 prpblems for renewable energy resources?
Difficult to build
Expensive
Spoils landscape/causes environmental damage
