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Simple Machines

The six types of simple machines
by

Angelina Tan

on 16 December 2014

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Transcript of Simple Machines

SIMPLE MACHINES
The six types of simple machines are:
1. Pulley
4. Screw
3. Inclined Plane (ramp)
5. Wheel and Axel
2. Lever
6. Wedge
Done By: Rain, Vaney & Angelina
Simple Machines
1. Pulley
2. Lever
3. Inclined Plane
4. Screw
5. Wheel and Axel
6. Wedge
irst-Class Lever
econd-Class Lever
hird-Class Lever
uman Levers
Fulcrum has to
be between the input
and output force.
Output & Input force are in opposite directions.
Input force is between fulcrum and Output force.
Output & Input
force are in the same direction.
Output force is between
fulcrum and Input force.
Output & Input
force are in
the same direction.
F
S
T
H
Levers are used in the human body everyday, for example:
To move your jaw/mouth.
To rotate your ankle.
To move your hand.
Throwing a ball.
Raking up leaves.
A shaft or axle that is attached
to a larger disk (wheel). Used to move things faster and easier.
A grooved wheel with a rope or cable looped around it.
Used to raise or lower objects. For example:
The axle turns when force is applied on the wheel.
A pulley works by redirecting the
force applied. For example when
force is applied downward on the rope the output force is in a upward direction and viceversa.
raising or lowering a flag
closing or opening blinds on window.
A sloping surface on which objects can move faster.
It increase the distance the
object has to travel but
decreases the work that has
to be done while going up and
down the ramp.
Mechanical Advantage: 3
Skateboard ramp and escalators.
Used to transport heavy things faster. For example:
Advantage of pulley depends on amount of support ropes, which in general is three (but can be more)
Mechanical Advantage:
Advantage of inclined plane is
length x height of the ramp.
Wheel and axles are used very often. For example: Screwdrivers
Bikes, Water taps, Car wheels, Roller skates, Doorknobs, Gears
Also used to transport things: Wagons, Cars, Trains.
Mechanical Advantage:
Mechanical Advantage:
Mechanical Advantage:
Mechanical Advantage:
Advantage of wheel and axle depends on where force is applied.
If force is applied to the axle,
Ideal Mechanical Advantage:
radius of axle divided by radius of wheel.
If force is applied to the wheel,
Ideal Mechanical Advantage:
radius of wheel divided by
radius of axle.
Advantage of lever is:
distance between input force and fulcrum
divided by
distance between output force and fulcrum
A bar that is supported at one point. Like a teeter totter, a lever turns around a fixed point called a fulcrum.
IMA
A wedge is an inclined plane that travels through the object or material.
It splits firewood. The narrower of the wedge would help the object to split.
Needles, knives, and your front teeth are all examples of wedges.
A screw is simply an inclined
plane that wrapped around the rod.
It works like the screw thread allows it to penetrate into hard wood with minimal force.
Foods jar because its lid at the top of the jar holds the lid firmly in place.
http://library.thinkquest.org/C004451F/nflever.htm
All levers contain a resistant arm, an effort arm and a fulcrum.
Used to apply leverage in order to move something heavy, or make something go fast.
A lever can be classified in three ways.
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