p6 fsci simple machine1
TRANSCRIPT
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Simple Machine!
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LeversLeversPulley SystemPulley SystemInclined PlaneInclined PlaneWheel & AxleWheel & Axle
GearsGears
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Levers !
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First Class Lever
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LoadFulcrum
EffortFulcrum = Pivoting Point
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Load
Effort 30g
100g
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Load
Effort
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First Class Lever(Examples)
ScissorsPliers
See-sawCrowbar
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Second Class Lever !!
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Load
Fulcrum
Effort
100g
30g
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Load
Fulcrum
Effort
100g
30g
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Second Class Lever(Examples)
WheelbarrowNutcracker
Bottle cap opener
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Third Class Lever !!
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Load
Fulcrum
Effort
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Load 100g
Fulcrum
Effort 300g
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Load 100g
Fulcrum
Effort 300g
Greater Effort!
Faster Speed!
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Third Class Lever(Example)
BroomFishing rod
Ice tong
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Pulley !
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Fixed Pulley System !
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Load
Effort
Effort and load move in opposite direction.
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Load
100g Effort
100g ?
120g ?
Effort needed equals
the Load if no
friction.
Effort needed greater than
Load, to overcome friction.
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Load
Effort
5 cm5 cm
Effort and load travel
equal distance.
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Load
Effort
Advantage;
Changes the
direction of an applied
force.
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Movable Pulley System !
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Load
Effort
Effort and load move in
same direction.
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Load
Effort
Effort travels
twice the distance
compared to the load.
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Load 100g
Effort 60g
Effort needed is less than the load.
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Load
Effort Allows a smaller effort to overcome a greater load.
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Pulley System !!
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Load
Effort
Effort and load move in opposite direction.
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Load
Effort
Effort travels greater
distance compared
to the load.
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Load 100g
Effort 50g
Effort needed is less than the load.
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Load 100g
Effort 50g
Pulley System
Advantage 1
Allows a smaller force to overcome
a greater load.
Advantage 2
Changes the direction of an applied force.
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Inclined Plane !!
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Load = 100g
Effort = 100g
Effort = 70g Effort = 60g
Load needs to travel longer distance.
Load needs to travel even longer distance.
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Examples of Inclined Plane
staircasesharp point of needlesharp point of iron nail
sharp end of an axe/knife
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Wheel & Axle !!
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Load
Effort
Axle
Wheel
Wheel & Axle
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Axle
Wheel
Load Effort
Effort & load moves in opposite direction.
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Axle
Wheel
Load Effort
A smaller effort is needed to lift the load.
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Axle
Wheel
Load Effort
Effort travels a greater distance than the load.
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Examples of Wheel & Axle
door handle/ knobscrew driver
bicycle handle-barsteering wheel
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Gears !!!
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Gear is a
wheel
with
teeth
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Gear can rotate
clockwise.
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Gear can rotate
anti-clockwise.
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Inter-locking gears.
Changes the direction of an inter-locking gear.
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Inter-locking gears.
Changes the speed of a smaller inter-locking gear with fewer teeth.
16 teeth
8 teeth
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Two gears joined by a chain.
Gear A & B move in SAME direction.
Gear B moves at faster speed than Gear A
A B