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What’s My Meaning?. Gearing Up. Pulley Power. Real Life Examples. What’s the Advantage?. 5 pt. 5 pt. 5 pt. 5 pt. 5 pt. 10 pt. 10 pt. 10 pt. 10 pt. 10 pt. 15 pt. 15 pt. 15 pt. 15 pt. 15 pt. 20 pt. 20 pt. 20 pt. 20 pt. 20 pt. 25 pt. 25 pt. 25 pt. 25 pt. 25 pt. - PowerPoint PPT Presentation
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What’s MyWhat’s MyMeaning?Meaning?
GearingGearingUpUp
PulleyPulleyPowerPower
Real LifeReal LifeExamplesExamples
What’s the What’s the Advantage?Advantage?
A gear is a simple machine. It is a toothed wheel that meshes another toothed mechanism.
It can change the speed, direction, or amount of force needed to do work.
Turn the first gear to make the second go
faster (second has fewer teeth so it rotates
faster)
Rotate B to make A go
fast
A Movable Pulley System
A movable pulley is a pulley that moves with the load.
•The advantage of a movable pulley is that the effort needed to move the load is less than the weight of the load.•The disadvantage is that the load is moving in the same direction as the effort and this is not always convenient.
A Fixed Pulley System
The fixed pulley is attached to an unmovable object.
•The advantage is that the direction of the effort needed to move the load is opposite to the load itself. •The disadvantage is that you have to apply the same effort to lift the load as the weight of the load.
Bicycles have sprocket and chain gears that work like some pulley systems. A chain connects the
sprocket gears on the pedals to the back wheel. The chain also allows the gears to turn in the same
direction. The sprockets keep the chain from slipping as it turns.
The gears turn in the same direction.
-The rider turns the pedals (input: force used to make the system work) which are attached to gears
- The gear has a chain around it attached to the gear at the back wheel
-The chain forces the back gear to turn
-The back gear is attached to the wheel so when it turns it forces the wheel to turn (output: what happens as a result of the input)
How many times would the follower gear rotate if the
driver gear were to rotate 2 times?
FOLLOWER
DRIVER
DAILY TRIPLE
How many times would the driven gear rotate if the driver gear were to rotate 3 times?
FOLLOWER
DRIVER
Fill in the blanks:1. A gear train can change the
_______, _______, or amount of _______needed to do work.
2. A pulley system can change the _______ of effort and the _______ of effort needed to move a load.