8th Grade Physical Science 2nd Semester Final Exam Review – Flashcards
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Newton
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the scientist who gave us the Laws of Motion
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3
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Laws of Motion
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Second Law
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that force is equal to mass times acceleration (F=MA)
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First Law
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law explains why we need to wear seat belts
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Third Law
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law says that for every action there is an equal and opposite reaction
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Second Law
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law says that heavier objects require more force than lighter objects to move or accelerate them
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Third Law
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law explains how rockets are launched into space
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Work
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is done when a force causes an object to move in the same direction that the force is applied
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Joules
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Work is measured in
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Watts
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Power is measured in
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Power
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is how quickly work is done
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Simple Machine
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is a machine that does work with only one movement
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Compound Machine
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is a machine made up of a combination of simple machines
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Pulley
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consists of grooved wheel with a rope or cable wrapped over it
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Wheel and Axle
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consist of two circular objects of different sizes that are attached in such a way that they rotate together
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Frequency
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number of wavelengths that pass any point per second is
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Compression
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is a part of a wave where the particles are close together
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Acceleration
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measured in m/s^2
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Crest
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the highest wave peak of a wave is the
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Deceleration
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The slowing down of objects is known as
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Trough
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the lowest point on a wave
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simple machine
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A tool that makes work easier
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force
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push or pull
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Incline Plane
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is a flat surface that is higher on one end
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energy
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the ability to do work
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acceleration
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the rate at which speed changes
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average speed
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the distance an object travels over time
