## Integrated Science Chapter 6

##### Created by:

15burkal  on September 13, 2011

##### Description:

Subjects: Work and energy

Freshman year

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# Integrated Science Chapter 6

 work = force * distancework formula
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#### Definitions

work = force * distance work formula
work the product of the force and the distance through which the force moves
Joule the SI unit for work and energy; a newton*meter
power the rate at which work is done
power = work done / time interval power equation
watt unit for measuring power, equals 1Joule of work done in 1 second
energy the ability to do work
potential energy and kinetic energy The 2 catagories of mechanical energy
potential energy energy due to position
kinetic energy energy of motion; depends on mass and speed
gravitational potential energy potential energy due to an object's elevated position
PE = weight * height gravitational potential energy formula
KE = 1/2mv² kinetic energy formula
Work = ΔKE Work energy theorem
Law of Conservation of Energy Energy cannot be created or destroyed. It can be transferred from one form to another, but the ammount of energy never changes.
Machine a device that can multiply forces or change their direction
lever contains effort arm, resistance arm, and fulcrum
fulcrum the point on the lever that dosen't move
effort arm the portion of the lever where you apply force
resistance arm the portion of the lever that is applying a force to move an object
1st class lever effort force at one end, resistance force at the other, fulcrum in the middle; ex. crowbar, see-saw
2nd class lever effort force on one end, resistance force in the middle, and fulcrum at the other end; ex. wheelbarrow
3rd class lever fulcrum at one end, resistance force at the other, and effort force in the middle; ex. rake, broom; increases distance covered by resistance arm
work output work input equals
pulley a special kind of lever
efficiency describes how much work a machine does
efficiency formula work done / energy used x 100%, or work output / work input x 100%

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15burkal