7th Grade

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7th Grade Unit 6 Forces and Motion Lesson 3
Simple Machines Vocabulary of Instruction
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Efficiency

• Is the balance between the form of an object and
  its function.

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Effort

• Is the force applied to an object in order to get
  it to move.

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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.

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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.

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Input

• Is the place where the power is entered into the
  system.

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Joule

• Is a metric system unit used to measure energy.

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Lever

• Is a simple machine in the form of a plank or bar
  that pivots on a fulcrum.

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Load

• Is an object or something that must be moved or
  supported.

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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.

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Newton

• Is a unit used to measure force.

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Output

• Is the point where the power comes out of a
  system.

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Pulley

• Is a simple machine in the form of a wheel with
  a groove around the edge.

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Resistance

• Is the tendency of a material to resist electric
  current passing through it or a force that
  opposes motion.

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Screw

• Is a simple machine in the form an inclined plane
  consisting of a spirally threaded cylindrical rod.

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Wedge

• Is a simple machine in the form of an inclined
  plane.

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W F x d

• The work done (W) is equal to the applied force
  (F) multiplied by the distance (D) the object
  travels.

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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

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Work

• Is an effort that causes motion or makes up a
  product.