8th Grade Physical Science 2nd Semester Final Exam Review

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