We use Simple Machines every day. Some in daily tasks and even
some in sports that we play. Write a short paragraph describing a
recent time you used a Simple Machine (Recall from the Machines
packet you read from).
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Identify systems having mechanical operations and explain their
function.(Explain how all the simple machines work) Be able to tell
the difference between the 3 classes of levers. Be able to tell the
difference between the different types of common gears.
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Can be as simple as a knife,
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a bottle opener,
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or a claw hammer.
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A Machine is a device that does some kind of work by changing
or transmitting energy. We use a machine to give us a mechanical
advantage to make work easier to accomplish.
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A shaduf, also spelled Shadoof, hand-operated device for
lifting water, invented in ancient times and still used in India,
Egypt, and some other countries to irrigate land.
http://www.britannica.com/EBchecked/topic/537571/shaduf Egypt
2 nd = Effort is at the END EFFORT then LOAD/RESISTANCE then
FULCRUM 3 rd = Effort is BETWEEN LOAD/RESISTANCE then EFFORT then
FULCRUM
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Take out a sheet of paper and put your name on it. You may use
your notes to a identify the following class of levers. For each
question, write down whether picture represents a first, second or
third class lever.
A pulley is a wheel on an axle that is designed to support
movement and change of direction of a cable or belt along its
circumference. Pulleys are used in a variety of ways to lift loads,
apply forces, and to transmit power.
An Incline Plane is a ramp that assists in moving heavy objects
up and down heights. The longer the distance of an incline plane,
the less effort is needed.
Based on the Incline Plane, a wedge separates an object, lift a
heavy load or keeps an object from moving. All in in an effort to
gain a mechanical advantage.
A simple machine of the inclined plane type consisting of a
spirally grooved solid cylinder and a correspondingly grooved
hollow cylinder into which it fits.
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Basic and Compound Gears
https://www.youtube.com/watch?v=D_i3PJIYtuY&list=PLJH
oydNo-lbQNxDuZ6HeMS69NGIlHLbgX&index=1 A rotating machine part
having cut teeth, which mesh with another toothed part to transmit
torque. Two or more gears working in tandem can produce a
mechanical advantage.
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Some gears can be hybrids What kind of gears do you see?
