Chapter 12 work, power,and machines
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.
____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
A Nm can be converted into a_____.
a _____is also equivalent to: 1kg•m2/s2
the quantity that measures work in relation to time is _____
power is the ____ at which ___is done
write the equation for power in word form:
power equals work divided by time
give the symbolic formula for power:
write the equation for work in word form
work equals force times distance
give the symbolic formula for work
whats equal to the total number of lawns mowed
whats equal to the rate of mowing
the SI unit of power is the
a ___is the amount of power required to do 1 joule of work in 1 second
work is done only when ____causes a change in the position or the motion of an object in the direction of the applied force.
Symbolic formula for power
units for power
A Watt is equal to a _____.
one joule of work performed in one second
equals one Newton-meter
amount of work performed over time
force times distance
an unpowered mechanical device
quantity that measures how much a machine multiplies force or distance