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Presentation transcript:

10 pt 10 pt 15 pt 15 pt 20 pt 20 pt 25 pt 25 pt 5 pt 5 pt 10 pt 10 pt 15 pt 15 pt 20 pt 20 pt 25 pt 25 pt 5 pt 5 pt 10 pt 10 pt 15 pt 15 pt 20 pt 20 pt 25 pt 25 pt 5 pt 5 pt 10 pt 10 pt 15 pt 15 pt 20 pt 20 pt 25 pt 25 pt 5 pt 5 pt 10 pt 10 pt 15 pt 15 pt 20 pt 20 pt 25 pt 25 pt 5 pt 5 pt What’s My Meaning?GearingUpPulleyPower Real Life Examples What’s the Advantage?

What is mechanical advantage?

Mechanical advantage is the amount of help that a machine gives you.

Describe how we can turn something to make something else turn.

When a gear turns it forces the meshed gear to turn as well.

How can a gear turn to make something else go straight?

Rack and pinion transfers motion from a rotation to a straight line

What is a PULLEY?

A pulley is a simple machine. It is made with a grooved wheel and a rope.

What is a GEAR? DAILY QUADRUPLE

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.

When the teeth of two gears are in contact with each other they are…

Meshed

How can a pulley change the type of motion?

A pulley can transfer/chang e a downward motion to an upward motion (lifting up to pulling down)

What would a gear system look like that speeds up motion?

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

Driver Follower ? What direction is the follower gear moving in?

Counter-clockwise Driver Follower

Identify the following: Gear Teeth Axle Meshed Area

This is an example of what type of pulley system?

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.

This is an example of what type of pulley system?

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.

Identify a pulley system that we use in our daily life

Pulley Systems Flagpole Clothesline Crane Elevator Etc.

What type of pulley system does NOT give you mechanical advantage?

A Fixed Pulley System

What is the effort needed to lift a load of 120N using this pulley system? (all movable pulleys)

30 Newtons

Match the following: Fixed Pulley Movable Pulley Block and Tackle Pulley A B C 1 2 3

Match the following: Fixed Pulley Movable Pulley Block and Tackle Pulley A B C 3 2 1

Worm Gear Bevel Gear Spur Gear A B C Match the following:

Worm Gear Bevel Gear Spur Gear A B C 1 2 3

What is different about the way gears on a bicycle turn in comparison to standard spur gears?

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.

Identify some gear systems that are used in daily life.

Gear Systems; Clocks Bicycles Hand drills Transmissions Etc.

How does a bicycle work?

-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

4 Times. This is an example of gearing up. FOLLOWER DRIVER

DAILY TRIPLE How many times would the driven gear rotate if the driver gear were to rotate 3 times? FOLLOWER DRIVER

1 Time. This is an example of gearing down. FOLLOWER DRIVER

What is the effort needed to lift a load of 50N using this pulley system?

25 Newtons

What is the effort needed to lift a load of 400N using this pulley system?

200 Newtons

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.

1.A gear train can change the speed, direction or amount of effort needed to do work. 2.A pulley system can change the amount of effort and the direction of effort needed to move a load.