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Machines
types of machines and work
14
Science
11/12/2011

Term
 Potential Energy
Definition
 the energy of position (top of the slide, highest point of the swing)
Term
 Kinetic Energy
Definition
 energy of motion or movement (the swing moving downward)
Term
 kinetic vs. potential
Definition
 kinetic energy becomes potential energy as the swing goes back up. Potential energy becomes kinetic energy as the swing goes back down. Explain the slide...
Term
 Work
Definition
 the result of a force moving an object...when pushes and pulls move an object, work is done. If the obeject does not move when pushed or pulled, then no work is done
Term
 Simple Machine
Definition
 a machine made of one or two parts (tools like a hammer or screwdriver)
Term
 Other simple machines
Definition
 ramp(inclined plane), wheelbarrow (wheel and axel-wheel attached to a rod), nail (wedge-it has slanted sides), screwdriver (lever), pulley (rope and wheel), screw (inclined plane wrapped around a rod)
Term
 Compound Machine
Definition
 a machine made of two or more simple machines like garden shears (lever and 2 wedges), hand mower (lever, wedge, wheel and axel), bicycle (wheel and axel, screws, levers)
Term
 fulcrum
Definition
 changes the direction of force on the garden shears and the edge of the paint can when using a screwdriver to open it
Term
 Complex machines
Definition
 a machine made up of many simple and compound machines like cars
Term
 electric charge
Definition
 if you rub two objects together, negative electric charges can move from one spot to another. Electric charges can be negative or positive; Ex: when you get shocked by your friend when she touches you.
Term
 electric current
Definition
 the flow of negative charges through matter
Term
 electric circuits
Definition
 electric current flows only through a closed circuit. When you flip the switch off, you have opened the circuit to the flow stops.
Term
 series circuit
Definition
 a circuit that connects several objects one after another so that the current flows in a single path
Term
 parallel circuit
Definition
 a circuit that connects several objects in a way that the current for each object has its own path.
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