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law of conservation of momentum
a rule that in the absence of outside forces the total momentum of objects that inetract does not change
the overall force on an object when all the indibidual forces acting on it are added together
wheel and axle
a simple machine that consists of two attached circular or cylindrical objects that rotate about a common axis, each one with a different radius
the rule that a stream f fast-moving fluid exerts less pressure than the surrounding fluid
a system that multiplies force by transmitting pressure from a small surface area through a confined fluid to a larger surface
the rule that the bouyant force an an object is equal to the weight of the fluid the object displaces
van allen belts
doughnut shaped regions 1,000-25,000 km aboce earth that contain subatomic particles traveling at high speeds`1
an atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth's magnetic lines of force
a region in which the magnetic fields of all atoms are lined up in the same direction
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