7th Grade Unit 6: Forces and Motion Lesson 3: Simple Machines Vocabulary of Instruction:
Fulcrum• Is the place upon
which a lever pivots ... the point that it swivels around... the object that it rocks up and down on, or back and forth around.
Inclined Plane• Is a simple
machine or mechanical device which reduces the effort needed to raise an object by increasing the distance that it moves.
Mechanical Advantage
• Is the upper hand you gain when you use a mechanical device or machine to help you multiply the amount of force you can transmit.
Resistance • Is the tendency of a material to resist
electric current passing through it or a force that opposes motion.
Screw• Is a simple
machine in the form an inclined plane consisting of a spirally threaded cylindrical rod.
W = F x d• The work done
(W) is equal to the applied force (F) multiplied by the distance (D) the object travels.
Wheel and Axle • Is a simple machine
comprised of a wheel attached concentrically to a drum so that a rope will wind and unwind alternately from the wheel to the drum creating mechanical advantage