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chapter: 14 section: 1
Terms in this set (20)
what is the scientific definition for work?
work: is done when a force causes an object to move in the same direction that the force is applied to
what is an everyday example of work? #1
when you lift your books, turn a doorknob, raise window blinds, or write with a pen, or pencil
what is an everyday example of work? #2
when you walk up a flight of stairs or open and close your school locker
example #1 pt #1
your teacher asks you to move box of books to the back of the classroom
example #1 pt #2
try as you might though you just can't budge the box because it is too heavy
example #1 pt #3
although you exerted a force on the box and you feel tired from it you have not done any work
in order for you to do work two things must occur
what two things must occur in order for someone/something to do work? #1
1: you must apply a force to an object
what two things must occur in order for someone/something to do work? #2
2: the object must move in the same direction as you applied force
what happens when you do work on an object?
you do work on an object only when the object moves as a result of the force you exert
example #2 pt #1
a girl might think she is working by holding the bags of groceries
example #2 pt #2
however if she is not moving she is not doing any work because she is not causing something to move
to do work what must happen?
an object must move in the direction a force is applied
is it possible that sometimes only part of the object of the force you exert moves an object?
what is an example of only part of a force you exert moving an object?
a lawn mower, you push at an angle to the ground, part of the force that is in the same direction as the motion of the mower
what is the work equation?
work (in joules) equals force (in newtons) times distance (in meters)
otherwise known as
what is power?
power is how quickly work is done
what does it mean to be powerful?
imagine two weight lifters lifting the same amount of weight the same vertical distance hey both do the same amount of work however the amount of power they use depends on how long it took to do the work
which weightlifter would win with this example?
the weightlifter who lifted the weight in less time is more powerful
what is the power equation?
power (in watts) equals work (in joules) over time (in seconds)
otherwise known as
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