Vocab
Force applied over a distance
Work
Potential
An incline plane wrapped around a cylinder
Screw
Unit for work
Joule
Unit for Power
Watts
Energy of motion
Kinetic Energy
Holding a stretched out rubber band
Potential (Elastic)
A slanted surface along which a force moves an object to a different elevation
Inclined plane
Equation for Work
W = Fd
Equation for Power
P = W/t
Energy due to position
Potential Energy
Sliding down a hill
Kinetic
A V-shaped object whose sides are two inclined planes sloped toward each other
Wedge
What two things must you know before you can calculate work?
Force and Distance
How do you get work done faster?
Use more Power!
Energy cannot be created or destroyed
Conservation of Energy
A ball being kicked into the wall
Consists of a rope that fits into a groove in a wheel
Pulley
Is it work?
Picking up weights from off the ground
Yes, you moved the weights a distance with an upward force.
In order to apply power and do work, what must you have?
Energy!
Acceleration towards Earth
Gravity
You sitting still in your chair (which probably isn't actually happening)
Potential
Consists of two rigidly attached disks or cylinders, each one with a different radius
Wheel and Axle
Is it work?
You hold a book over your head without moving.
No, you are not moving the book a distance!
Force and Distance!