Work
This is the unit for work
Joule
This is the unit for power
Watt
Potential energy is the energy an object has based on this
Its position
The potential energy of an object at the beginning of an event is equal to this
The kinetic energy at the end of the event
Machines can alter the force needed, change the distance over which the force moves, or change this
the direction of the force
The unit for efficiency is this
a percentage
In physics work is defined as this
Force times distance
this is the formula for power
work divided by time
This is the formula to find potential energy
mass times gravity times hieght
An object at rest may still have this
Energy
Work input is equal to this when we ignore friction
work output
Efficiency is defined as useful energy output divided by this
total energy output
Twice the force exerted across twice the distance produces this much work
Four times as much
According to the work-energy theorem the work done on an object is equal to this
Its kinetic energy
This is when energy is most evident
When it is changing
an object must be moving to have this
kinetic energy
This is the principle underlying every machine
The conservation of energy
Typical cars are about this efficient
30%
This is the distance covered when 10 joules of work is done using 1 newton of force
10 meters
This much power is required to do 40 J of work in 5 seconds.
8W
The amount of potential energy possessed by an elevated object is equal to this
The work done lifting it
There are this many seconds in an hour
3600
Applied force times applied distance divided by output force is equal to this
output distance
Comparing transportation efficiencies we find the most efficient is this one
a human on a bicycle
Objects with less mass but the same kinetic energy must have this
This much power is required to do 60 J of work in 1 minute.
1 watt
If an object has a mass of 10 kg and a potential energy of 100 J how high is it in the air? (g=10m/s2)
One meter
This is a byproduct of nuclear power in the Earths' interior
geothermal energy
This is the ratio of output force to input force of a simple machine
Mechanical advantage
This is the graveyard of useful energy
the environment around us