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Machines
types of machines and work
14
Science
4th Grade
11/12/2011

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Cards

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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