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Transcript of Levers
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 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
Chains in a bike
When a spring is squeezed or made shorter it's called compression.
Types of springs in compression:
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:
Wind Up radio
Types of wheels and cranks:
A pencil sharpener
1st class levers:
2nd class Levers:
3rd class levers:
"Screws magnify your strength. All your effort to turn them is collected into small movements inward."
Screws:by David Glover
Types of screws:
Nuts and bolts
A ramp is a slope for moving heavy things up and down.
Types of ramps:
A zigzag path
Amusement park rides
A wedge is a small ramp that you can move.
Types of wedges:
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