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ch 12345
physics
question | answer |
---|---|
Energy | the ability to cause change measured in joules |
three forms of energy | Kinetic energy, potental energy, and mechanical energy |
kinetic energy | the form of motion and depends on mass and velocity |
potential energy | its stored energy and depends on position or configuration of an object |
three types of potential energy | Elastic energy, Chemical energy, gravitational energy |
explain mechanical energy | the sum of the total amount of potential and kinetic energy in a system |
law of conservation states | energy cannot be created or destroyed |
when a car begins to move, what type of energy conversion occurs | electrical to mechanical to kinetic energy |
what energy is applied when rubbing hands together | kinetic energy |
what type of energy is in fuel | coal, natural gas, and nuclear |
what is the formula for gravitational potential in an object | gpe=ugh |
power | rate at which energy is converted, measured in watts |
what is work | transfer of energy when a force is applied over a distance measured in joules |
when is work not applied | one person is on one side of a box and another person is on the other and both are pushing not going anywhere so work is not being done |
mechanical advantage | ratio of the output force exerted by a machine to the input force applied to the machine, |
units for energy | energy=joules work=joules power=watts |
can input work = output work | No because gravity is attracting on objects |
six simple machines | pully, lever, wheel and axel, and screw |
fulcrum | the point at which a lever recedes |
one joule | is work of units |
one watt | is power of units |
temperature | measure of the average kinetic energy of all the particles to make up an object |
how is kinetic energy and temp alike | higher the temp the more thermal energy is possible |
heat | energy that is transferred between objects due to a temp difference between those objects |
three methods of transferring thermal energy | the temp, mass, and type of substance |