Making WORK easier!Making WORK easier!

Types of Simple MachinesTypes of Simple Machines

LeverLever

ScrewScrewWedgeWedge

Inclined PlaneInclined PlanePulleyPulley

Wheel and Wheel and axleaxle

Big Bang Theory clip

Ideal Mechanical Advantage - PulleyIdeal Mechanical Advantage - Pulley

I.M.A. = I.M.A. = number of rope sections number of rope sections pulling upwardspulling upwards

IMA = 1IMA = 1 IMA = 2IMA = 2

IMA = 1IMA = 1

Changes directionChanges direction of force so of force so the work is easier (you are the work is easier (you are now working with gravity now working with gravity instead of against it)instead of against it)

IMA = 2IMA = 2

MultipliesMultiplies the force the force by 2 so that you can by 2 so that you can lift something twice lift something twice as heavy as you pull.as heavy as you pull.

Single Fixed Single Fixed PulleyPulley

Movable PulleyMovable Pulley

IMA = 1IMA = 1

IMA = 2IMA = 2

What is the IMA of the following What is the IMA of the following pulley system?pulley system?

1 2 3 4

25% 25%25%25%

1.1. 11

2.2. 22

3.3. 33

4.4. 44

What is the IMA of the following What is the IMA of the following pulley system?pulley system?

1 2 3 4 5

20% 20% 20%20%20%

1.1. 11

2.2. 22

3.3. 33

4.4. 44

5.5. 55

Inclined planeInclined plane

FFrrFe

WWoutout = = FFrr··ddrr

WWinin = = FFee··ddee

Ideal Mechanical Advantage - Ideal Mechanical Advantage - Inclined PlaneInclined Plane

IMA = LIMA = L

hhLL

hh

Big Bang Theory clip

Wheel and axleWheel and axle

I.M.A. = I.M.A. = radius of wheelradius of wheel

radius of axleradius of axle

WedgeWedge

Two sloping sides – changes direction of Two sloping sides – changes direction of the forcethe force

ScrewScrew

A wedge with an inclined plane wrapped A wedge with an inclined plane wrapped around itaround it

More turns = higher mechanical More turns = higher mechanical advantageadvantage

Frayer ModelFrayer ModelExamples:Examples: Non-examples: Non-examples:

Essential Essential Non-essential Non-essential

Characteristics: Characteristics:Characteristics: Characteristics:

11stst class levers class levers

See-sawSee-saw

CrowbarCrowbarWheelbarrowWheelbarrow

RakeRake

Effort force, Resistance Effort force, Resistance force, and fulcrum present.force, and fulcrum present.

Fulcrum is between effort Fulcrum is between effort force and resistance force.force and resistance force.

Mechanical advantage is Mechanical advantage is one or more.one or more.Makes work easier by Makes work easier by multiplying the force.multiplying the force.

Frayer ModelFrayer ModelExamples:Examples: Non-examples: Non-examples:

Essential Essential Non-essential Non-essential

Characteristics: Characteristics:Characteristics: Characteristics:

Inclined PlanesInclined Planes

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