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Chapter 12 work, power,and machines

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different examples for work are
you work on science problems.
you got to work
your toaster oven doesnt work
raking out the tash is too much work
work is done only when a ____causes a change in the position or motion of an object in the direction of the applied force.
force
____is calculated by multiplying the ____ by the ______ over which the force was applied.
work, force, distance
the unit of work and energy was named in honor of the english physicist ____ _____ ____
James Prescott Joule
because work is calculated as ____times ____it is measured in units of newtons times meters, N•m
force, distance
A Nm can be converted into a_____.
joule
a _____is also equivalent to: 1kg•m2/s2
joule
the quantity that measures work in relation to time is _____
power
power is the ____ at which ___is done
rate, work
write the equation for power in word form:
power equals work divided by time
give the symbolic formula for power:
p=W/t
write the equation for work in word form
work equals force times distance
give the symbolic formula for work
W=F•d
whats equal to the total number of lawns mowed
work
whats equal to the rate of mowing
power
the SI unit of power is the
Watt
a ___is the amount of power required to do 1 joule of work in 1 second
Watt
work is done only when ____causes a change in the position or the motion of an object in the direction of the applied force.
force
Joule=
kg•m2/s2
Symbolic formula for power
P=W/t
units for power
Watts
A Watt is equal to a _____.
j/s
Watt
one joule of work performed in one second
Joule
equals one Newton-meter
Power
amount of work performed over time
Work
force times distance
Simple Machine
an unpowered mechanical device
mechanical advantage
quantity that measures how much a machine multiplies force or distance