what is a machine.
a device that changes the amount of force exerted, the distance over which force is exerted, or the direction in which force is exerted.
a sloped surface used to move objects from a low point to a higher point.
an inclined plane wrapped in a spiral around a cylinder.
two inclined planes put back to back for the purpose of splitting, and fastening (holding together) inclined plane that comes to a sharp edge.
wheel & axle
a wheel is fixed to a shaft;the heel & axle move together; when the heel is turned, the axle rotates in the same direction.
consists of a wheel that rotates freely around a stationary axle.
lever 1st class
lever 2nd class
lever 3rd class
broom,pencil,fishing pole, baseball bat,elbow