- 154 Views
- Uploaded on
- Presentation posted in: General

Machines

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

By Carly Carlson

Machines

- Simple machine- A machine that changes the amount of force put in to motion, normally making a job easier
- There are 6 simple machines: lever, pulley, wheel and axle, inclined plane, screw, and wedge.
- A complex machine is made out of 2 or more simple machines (ex. Bicycle or an axe)

- A lever is a simple machine that helps to lift weights.
- An example of a lever is a hammer when pulling out a screw, a can opener, fishing rod, etc..
- To calculate the Mechanical advantage you divide the effort arm by the resistance arm

- Pulleys are used to reduce the amount of force needed to lift a load, uses a groove and a rope.
- Pulleys are used on ships to lift and lower a sail.
- The mechanical advantage of a pulley is found by dividing the output force by the input force

- A wheel and axle is a lever that rotates around the fulcrum, the larger wheel rotates around the smaller wheel (axle)
- An example of a wheel and axle is a Ferris wheel.
- The mechanical advantage is found by dividing the radius of the wheel by the radius of the axle.

- An inclined planes is a flat, slanted surface used to raise an object
- A commonly used example is a ramp used to lift heavy objects into trucks.
- To find the mechanical advantage you divide the length by the height

- A screw is a shaft with a groove or thread formed around the surface.
- The more threading on the surface the greater the mechanical advantage.
- Screws can raise weights, or press and fasten objects.
- Ex: Archimedes water pump, or just a plain screw

- A wedge is shaped like an inclined plane, and is normally used to separate or hold.
- Ex: you can take a strong wedge and slam it into a log and break the wood.
- Another example is a shovel or a knife splitting something open.
- The mechanical advantage is found by dividing the length of the slope by the thickness at the big end.