GEARS

WHAT IS A GEAR?

• A gear is a modified wheel and axle.
• Gears are circler.
• They have teeth that mesh with each other.

THE TYPES OF GEARS.

• Effort gear
• Resistance gear
• They aways work thougther.

HOW GEARS WORK WITH EACH OTHER.

• Gears of many sizes can work with if each other.
• Gears must have the same teeth to work with each other.
• Larger gears have more teeth, smaller gears have less

HOW CAN WE USE THEM?

• Gears can be used to change speed a direction.
• Gears can be used to conect axles.
• Gears are often used in car engines.

HOW DO WE CALCULATE THE MA?

• To calculated the MA make a ratio of the teeth on the 2 gears.
• Ex. The resistance gear has 4 teeth and the effort gear has 8 this makes the MA 2.
• The MA mean how many times the effort gear will turn for each rotation of the resistance gear.

FUN FACTS.

• The first gears where wooden.
• Metal gears appeared in 87 BC.
• Gears are simple machines.