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23 terms

CCDS 7th Grade Science Test: Work, Simple Machines, and Energy

STUDY
PLAY
Work
force that is being moved a certain distance measured in joules (J)
Energy
the ability to do work
Mechanical Energy
energy in an object because of its motion or position
Potential Energy
related to the object's position; car balanced on a mountain top
Kinetic Energy
energy an object has because it is moving; big truck moving faster than a small truck
Electrical Energy
negatively charged energy flowing through a conductor
Nuclear Energy
energy kept in a nucleus
Thermal Energy
heat energy; energy related to the temperature of a substance; water boiling in a pot
Sound Energy
energy traveling through mechanical waves; megaphone
Convection
(thermal energy); is the transfer of heat in a fluid through CURRENTS
Conduction
(thermal energy); is the transfer of heat from a warmer substance to a cooler substance through DIRECT CONTACT
Radiation
(thermal energy); is the transfer of energy as electromagnetic waves (SUN). CAN OCCUR THROUGH EMPTY SPACE.
Electromagnetic Energy
energy caused by negatively charged particles in motion;
Energy Conversions
follows the Law of Conservation of energy; a form of energy turning into a different type of energy
Law of Conservation of Energy
Energy cannot be created or destroyed
Screw
an inclined plane with a cylinder wrapped around it
Wedge
an inclined plane that moves and causes objects to either slpit or lift
Wheel and Axle
a simple machine that is a shaft (axle) inserted through a wheel
Inclined Plane
a simple machine that is a flat, sloping surface
Pulley
a simple machine with wheel(s) with a rope wrapped around it
Lever
a simple machine that is a bar balancing on a fulcrum
Effort
force applied on a lever
Load/Resistance
load/resistance is the object being pushed up by the effort force