energy? Flashcards
(23 cards)
list 5 forms of energy
mechanical, nuclear, chemical, light, sound
what r the 2 categories of energy
kinetic and potential
whats energy
the ability to cause change
whats kinetic energy give an example
energy in the form of motion ex going down a slide
whats potential energy give an ex
energy that is stored ex waiting at slide
list 2 things that would contain elastic energy
spring and rubber band
what has gravitational energy
anything that can fall
what is mechanical energy
potential and kinetic energy
what does the law of conservation of energy state
energy may change form but it cant be created nor destroyed in ordinary circumstances
whats work what unit is it measured in
transfer of energy that occurs when a force makes an object move. joules
what direction does the motion occur when work is done
same direction as the force
whats power
the rate at which work is done
what are machines and how do they make work easier
device that makes doing work easier by increasing the force that can be applied to an object
what are the 2 forces involved in machines
fi and fo
what is mechanical advantage
ratio of the output force to input force
whats efficiency
measure of how much work put into a machine changed into useful output work by the machine
whats the relationship between ma and e
as ma increase e increases
what are levers
bar is free to pivot around the fixed point
what are pulleys
grooved wheel with rope, chain, cable running along the groove
what are the classes of levers
1,2,3
what are the classes of pulleys
fixed, moveable, block and tackle
whats mass
amount of matter in an object
whats weight
amount of gravitational force an object feels in relation to another object
