Welcome Back Minions!!! Warm up on the board….

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Presentation transcript:

Welcome Back Minions!!! Warm up on the board…

Effort & Load Effort Load Force applied to an object. The opposition to applied force, such as a weight to be carried or moved.

Simple Machines… 6 types of “Simple Machines” Inclined Plane Wedge Levers (3 classes)  Today!!! Screw Wheel & Axle Pulley (3 classes)

Opener for Levers Give me a lever long enough and a fulcrum on which to place it, and I shall move the world. -Archimedes (btw… the lever would have to be around 100,000,000,000,000,000,000,000 meters long and moved 100,000,000,000,000,000,000 meters down just to budge the Earth about 1mm!!!!!)

Where have you seen levers before? So what is a lever? Lever A rigid bar that is free to pivot, or rotate, on a fixed point.

Parts of a Lever Fulcrum Input Force Output Force Fixed point that a lever pivots around Input Force The force exerted to the machine Output Force The force exerted from the machine to the object it acts upon

Power of 3… 3 Classes of Levers All depends on the fulcrum! First Class Levers Second Class Levers Third Class Levers All depends on the fulcrum!

First Class Lever First Class Lever Always changes the direction of the force. Fulcrum closer to output force; the lever increases force. Fulcrum closer to input force; the lever increases distance.

Give me examples… First Class Levers Seesaws crowbar scissors an oar attached to a boat a claw hammer trebuchet siege weapon

Second Class Lever Second Class Lever Increase force but do not change the direction of the force.

Give me examples… Second Class Lever wheel barrow hole puncher Stapler nutcracker bottle opener nail clippers paper cutter

Third Class Lever Third Class Lever Increases distance, but do not change the direction of the force.

Give me examples… Third Class Lever Baseball bat Broom Doors Fishing rod Tweezers Mouse trap Catapult

Lever – Mechanical Advantage Increases input force Change direction of Input force

Simple machines in the body… Some of you wondered about this…

Which Class Lever is it??? Seesaws Tweezers crowbar hole puncher Stapler Mouse trap nutcracker bottle opener Scissors Fishing rod Trebuchet Catapult 1st Class Lever 3rd Class Lever 2nd Class Lever