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# Simple Machines

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by

## Alondra Hernandez

on 12 February 2017

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#### Transcript of Simple Machines

Simple Machines

Inclined Plane
An Inclined Plane is a slanted/sloped surface or ramp; used to move somethng from one place to another.
Has one end higher than the other.
And it's used as an aid for raising or lowering a load.
Examples of Inclined plain is:
-skate ramp
-wheelchair ramp
Lever
A
lever
is a rigid(hard) rod or plank that pivots about a specfic point.
The point about which the lever pivots is called a fulcrum.
The word lever comes from French meaning "to raise".
There are three classes of levers:
- First-class lever
- Second-class lever
- Third-class lever
Simple Machines
A
simple machine
is a machine that does work with only one movement.
It's a non-powered mechanical device that changes the direction or magnitude of a force and it does work much easier.
The six classical simple machines are:
-Lever
-Wheel and Axle
-Pulley
-Inclined Plane
-Wedge
-Screw
Wheel and Axle
A
Wheel and Axle
consists of two circular object of different sizes the are attached in such a way that they rotate together.
The wheel and axle was identified by Renaissance scientists drawing from Greek texts on technology
The mechanical advantage of a wheel and axle is usually greater than one.
Examples of Wheel and Axle are
-doorknob
-bicycle
-tire
-roller skates

Wedge
A wedge is a moving inclined plane; used to hold thing in place or separated.
It's a triangular shaped tool, a compound and portable inclined plane.
It can be used to separate two objects or portions of an object, lift up an object, or hold an object in place.
Examples of a wedge is:
-axe
-knife
-door stopper
-saw
Pulley
A
Pulley
consists of a grooved wheel with a rope or cable(belt, chain, or string) wrapped over it.
It's a wheel on an axle that is designed to support movement and change of direction.
Pulleys are used in a variety of ways to lift loads, apply forces, and to transmit power.
There are three types of pulleys:
-Fixed Pulley
-Movable Pulley
-Compound
Screw
A screw is an inclined plane wrapped around a cylinder or post; twisted into a spiral; usually used to attach or hold things together.
The screw was one of the last of the simple machines to be invented.
It first appeared in ancient Greece.
Examples of a screw is:
-screw
-bottle cap
-light bulb

By: Alondra Hernandez-Lopez
First-class lever
Second-class lever
Third-class lever
First-Class Lever
Second-Class Lever
Third-Class Lever
The fulcrum in the the middle and the effort is applied on one side of the fulcrum and the resistance on the other side.
The mechanical advantage may be greater or less than 1.
Examples of first-class lever are:
-crowbar
-see-saw
-scissors
-plier
-a hammer pulling nails
Resistance in the middle, the effort is applied on one side of the resistance and the fulcrum is located on the other side
The mechanical advantage is always greater than 1.
Examples of second-class lever are:
-wheelbarrow
-nutcracker
-bottle opener
-the brake pedal of a car.
Effort in the middle, the resistance is on one side of the effort and the fulcrum is located on the other side.
The mechanical advantage is always less than 1.
-pair of tweezers
-broom
-fishing rod
-baseball bat
-human arm
Fixed Pulley
A
Fixed Pulley
has an axle mounted in bearings attached to a supporting structure.
A fixed pulley changes the direction of the force on a rope or belt that moves along its circumference.
Example of a fixed pulleys are:
-flag pole
Axle
Wheel
wheel
axle
Movable Pulley
A movable pulley has an axle in a movable block.
A single movable pulley is supported by two parts of the same rope and has a mechanical advantage of two.
Example of a movble pulley are:
-anchor
Compound Pulley
A combination of fixed and a movable pulleys forms a block and tackle.
A block and tackle can have several pulleys mounted on the fixed and moving axles, further increasing the mechanical advantage.
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