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Levers

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by

Andrew Shamoon

on 19 May 2015

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Transcript of Levers

Simple Machines: By Andrew Shamoon
Pulleys And Gears
Pulleys and gears are very important to everyday life. They help many machines move.
Wheels And Cranks
Wheels are another very important simple machine. Wheels help things move. For example, in a car, the wheels are the only reason the car moves easily.
Levers are simple machines that make work easy. They have a pivot ( fulcrum) point in the middle of the simple machine. They have 3 classes. 1st 2nd and 3rd class.
Springs
Springs are important to everyday life. The have fun and serious jobs.
Pulleys and gears can be seen almost anywhere.
Here are some types of pulleys and gears.
The pole on a U.S. flag
Ropes on the deck in a yacht
Amusement park rides
Steam Engines
Chains in a bike
Drills
Clocks
Watches
Sprockets

When a spring is squeezed or made shorter it's called compression.
Types of springs in compression:
Bikes
Moon Shoes
Pens
Pogo Sticks
Beds
Umbrella
Clipboard
Wind-Up Toys
Pinball Machine
Levers
For example, in a seesaw, the pivot helps the seesaw stay balanced.
The effort in the fulcrum is the amount of push or pull .
The load is the weight that is lifted.
After this, the fulcrum changes position.
When a spring is stretched, it is called tension.
Types of springs in tension:
Trampoline springs
Bike springs
Slinky
Jack-In-A-Box
Chair springs
scale springs
Wind Up radio
Types of wheels and cranks:
A pencil sharpener
Carts
Car wheels
Bikes
Roller Blades
Trucks
Wheels
Records

1st class levers:
Seesaws
Bottle Opener
Pliers
Balance
Cutters

2nd class Levers:
Nutcracker
Screwdriver
Dolly/Handcart
3rd class levers:
Tennis racket
Claw hammer
Your arm
Hockey Stick
Baseball Bat
Golf Club
Jaw
Fishing Rod
Screws:
"Screws magnify your strength. All your effort to turn them is collected into small movements inward."
Screws:by David Glover
Types of screws:
Screw caps
Nuts and bolts
Cork screws
Hand drill
Water Screws
Propeller

A ramp is a slope for moving heavy things up and down.
Types of ramps:
A zigzag path
Hairpin turns
Snow ramp
Amusement park rides
A wedge is a small ramp that you can move.
Types of wedges:
Starting blocks
Metal wedges
Chocks
Ax
Plows
Scissors
Teeth
Slider
Furrow
When a lever is in 2nd class motion, the load is between the fulcrum and the effort.
When a lever is in 3rd class motion, the effort is in the center.
When a lever is in 1st class, the load is close to the fulcrum. With a lever, you can lift the load easily.
I used 6 different books- all by David Glover.The copyright for each book is 1997
Full transcript