simple machines Flashcards
(24 cards)
work
when force is exerted on an object and the object moves
power
rate at which work is done
joule
work= force x distance, unit that describes work
watt
power is described in watts
machine
a device that makes work easier and more efficient
input force
energy put in a machine
output force
work that the machine produces
mechanical advantage
the number of times a machine multiplies the input force
mechanical efficiency
mechanical advantage x 100%
lever
rigid bar that rotates on a fixed point
pulley
a grooved wheel with a rope attached
wheel and axel
two circular objects that rotate together
inclined plane
ramp,straight, slanted surface- MA= length of ramp/height if ramp
wedge
small ramp- inclined plane, axe, zipper teeth
screw
an inclined plane wrapped around a cylinder
energy
the ability to do work
kinectic energy
the energy of an object that us due to the objects motion
potentilal energy
the energy that an object has because of its position shape or motion of the object
mechanical energy
the amount of work and object can do because of the objects kinectic and potential energy
energy conversions
a change from one energy to another
friction
a force that opposes motion between 2 surfaces that are in contact
law of conversion of energy
the law that states that energy cannot be destroyed but can be changed from one form to another
non-renewable resource
a resource that forms at a rate that is much slower than the rate it is consumed
renewable resources
a natural resource that can be replaced at the same rate at which it is consumed
