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36 terms

Unit Two:Energy, Work, Simple Machines

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Potential Energy
Energy that is stored
Kinetic Energy
Energy of motion
Mass and Velocity
Kinetic energy depends on two variables..
Thermal Energy
Energy due to friction, also refred to as heat energy. example: a toaster.
Joules
The unit used for any kind of energy
Kg
Unit for mass
m/s
Unit for velocity
Chemical
This type of potential energy is energy stored in chemical bonds. Plants use the suns energy to create this type of energy
Elastic
Energy stored by things that stretch or compress is called potential energy
Electrical Energy
Energy used to run electronics
Mechanical Energy
the total amount of potential and kinetic energy in a system
conservation of energy
the law of ...... states that although energy can change forms it cannot be created nor destroyed
height
Gravitational potential energy depends on two variables mass and (blank)
Nuclear Fusion
When two atoms combine and energy is released, occurs in the sun
Nuclear Fission
When two atoms separate and energy is released.
efficiency
A measure of how much input work is turned into useful output work done by the machine.
Lever
A bar free to move about a fixed point called a fulcrum
Wedge
An incline plane with one or two sloping sides
Pulley
Grooved wheel with a rope running along the groove
Wheel and Axle
Two wheels of different sizes that rotate together
Incline Plane
Sloping surface used to raise objects
Screw
Incline plane wrapped around a cylindrical post
Work
Force x distance, or equal to the change in energy
Power
The rate of doing work, Work/time
Machine
A device that makes doing work easier
Effort Force
The force you exert on a machine is called the..
Resistance Force
The force the machine exerts on an object
Electrical
(Blank) energy refers to the flow of electrons
Sound
This form of kinetic energy travels in vibrations
Radient
(blank) energy includes visible light, radio waves, and even gamma rays.
Coal
This is the most used source of energy to generate our electricity.
Natural Gas
this non renewable source of energy can be burned to generate heat for our homes or to generate electricity
Wind
This renewable source of energy uses a giant turbine to catch the kinetic energy of the air
Solar
this renewable source of energy uses solar panals to capture the energy from the sun.
Hydroelectric
Passing water through a dam to spin electric generators takes place in this renewable source of energy.
greenhouse
using fossil fuels to generate our electricity produces (blank) gasses in our atmosphere.