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
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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
PulleysSlide23Slide24
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