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Levers and Pulleys Levers and Pulleys

Levers and Pulleys - PowerPoint Presentation

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Uploaded On 2017-12-20

Levers and Pulleys - PPT Presentation

Not so simple machines Just think Could you lift your science teacher in the air Keep Thinking This means you dont have to write this Building a house Lifting a car Building the pyramids ID: 616800

class levers simple wheel levers class wheel simple machines axle pulleys include lever machine effort fulcrum plane inclined page pulley examples paper

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Presentation Transcript

Slide1

Levers and Pulleys

Not so simple machines!Slide2

Just think….

Could you lift your science teacher in the air?Slide3

Keep Thinking…..

(This means you don’t have to write this!!)

Building a house

Lifting a car

Building the pyramids

Handicap ramps

Paper cutters

Wheels on a car

What do all of these have in common?

They are use simple machines!Slide4

Important Definitions

Machine- device for doing work

Complex machines have motors, simple machines do not

Effort- the amount of force applied to a machine

Effort is measured in

Newtons

(N)Slide5

Types of Simple Machines

LeverPulley

Wheel and axle

Inclined plane

Wedge

ScrewSlide6

Just Read…

Simple machines have been used for thousands of years. They were even used to help build the pyramids!Slide7

Levers

The most simple and most common simple machine. Slide8

3 Parts of a leverSlide9

Class 1 LeversSlide10

Class 1 Levers

The fulcrum is located somewhere between the effort and the load

Examples include:

The claw of a hammer

crowbarSlide11

Double Class 1 Levers

Two levers working together form a double lever

Examples Include:

Scissors

Tin snipsSlide12

Class 2 LeversSlide13

Class 2 Levers

Has a fulcrum at one end of the lever armExamples include:

Paper cutter

WheelbarrowSlide14

Class 3 LeversSlide15

Class 3 Levers

In a class 3 lever, the fulcrum is at one end, and the effort is applies between the fulcrum and the load

Examples include:

Baseball bat

Fishing pole

CatapultSlide16

Wheel and AxleSlide17

Wheel and AxleSlide18

Wheel and Axle

Can be an actual wheel and axle OR a bar that rotates around an axis

Examples include:

Steering wheel

A wrench turning a bolt (see levers and pulleys book page 7)

Windlass (crank used to raise a bucket, see page 8)

Handle of a faucet (page 8)Slide19

The Inclined PlaneSlide20

The Inclined PlaneSlide21

The Inclined Plane

A sloped, flat surface, or ramp

One-part simple machine that does not moveSlide22

PulleysSlide23
Slide24

Pulleys

A pulley is a wheel that is free to turn on an axle

The wheel is called a sheave

A pulley is considered to be a variation of the lever

Pulleys can be

fixed

or

movable