Energy
Device that helps people do work by changing the way work is done.
Machines
Grooved wheel with a rope or cable wrapped around it.
Pulley
Two or more simple machines working together.
Complex machines
Energy must have the ability to cause
Conversion of energy from one form to another.
Energy transformation
Pivots around a fixed point (fulcrum)
Lever
Power
How gravitational potential energy is calculated.
mass x gravity x height from ground
Object that has energy because it is in motion has what kind of energy?
Kinetic energy
List one type of pulley.
Fixed, movable, or block and tackle
Formula for work.
force x distance
Mechanical energy
Transfer of energy that occurs when a force makes an object move in the direction of the force while the force acts on the object.
Work
a _____ is an inclined plane wrapped around a cylinder.
Screw
How is mechanical efficiency expressed?
A percentage
Force you apply to a machine through a distance is called
input force
Stored energy that depends on the interaction of objects, particles, or atoms
Potential Energy
a doorknob, a car's steering wheel, and screwdriver is what type of machine.
Wheel and axle
Number of times the machines multiplies the input force
Mechanical advantage
How do simple machines change the amount of work you're doing?
Change the size and direction of a force