# Shared Flashcard Set

## Details

1st Quarter Exam Vocabulary Review
32
Science
10/31/2011

Term
 Force
Definition
 Force is something that changes the motion and/or shape of an object.
Term
 Theory
Definition
 A theory is a scientists conclusion of why something happens the way it does.
Term
 Mass
Definition
 The amount of matter in an object.
Term
 Inertia
Definition
 The tendency of objects to resist a change in motion.
Term
 Vectors
Definition
 In physics a vector can represent a directional force. Vectors have both direction and magnitude or strength.
Term
 Heat Engine
Definition
 A machine that converts heat energy into mechanical energy. (This can be a natural machine like a hurricane.)
Term
 Satellite
Definition
 An object that orbits another object.
Term
 Friction
Definition
 A force that resists motion and produces heat.
Term
 Elastic Force
Definition
 A returning force
Term
 Galileo
Definition
 Galileo Galilei (1564-1642) conducted many experiments dealing with the earth's gravitational pull. Many of his experiments were done on the famous Leaning Tower of Pisa. Like many scientists with new ideas, his peers did not accept his discoveries and considered him a heretic.
Term
 Speed
Definition
 Speed equals the distance traveled divided by the amount of time it took.
Term
 Newton's 3 Laws of Motion
Definition
 1. Tendency of objects to resist a change in motion.2. A force causing an object to speed up or slow down is equal to the mass of that object. Force = Mass X Acceleration- Simply put it takes more effort (force) to get an object with a lot of mass to move or change direction than it does an object with less mass. 3. For every action, there is an equal and opposite reaction.
Term
 Solar System
Definition
 The Solar System consists of our sun and everything that travels (orbits) around it.
Term
 Fluid Dynamics
Definition
 The Study of the mechanics of how fluids flow
Term
 Scientific Method
Definition
 A method for conducting science that usually includes and observation, hypothesis, experiment, and theory.
Term
 Lubricant
Definition
 A substance that reduces friction between two moving surfaces.
Term
 Centripetal Force
Definition
 A force that continually pulls a spinning object toward its center.
Term
 Acceleration
Definition
 The rate of change of velocity in relation to time. (See Newton's 2nd law of motion)
Term
 Bernoulli's Principle
Definition
 The pressure in a fluid decreases as the speed of the fluid increases.
Term
 Orbit
Definition
 A repeating path in space that one object takes around another.
Term
 Observation
Definition
 Anything that is observed that is consistent (happens the same each time)
Term
 Fluid
Definition
 A substance that flows with relative ease. Water (liquids) and air (gas) are both fluids.
Term
 Pressure
Definition
 Pressure is the amount of force on a certain amount of surface area.
Term
 Action/Reaction
Definition
 Every action is accompanied by a reaction of equal magnitude but opposite direction. (Newton's 3rd law of motion)
Term
 Displacement
Definition
 The straight line change in position of an object.
Term
 Spring Tide
Definition
 A strong tide that happens when the sun and the moon are aligned with the earth.
Term
 Hypothesis
Definition
 A scientists "best guess" as to why something is happening.
Term
 Gravity
Definition
 A force that pulls all things toward each other.
Term
 Buoyancy
Definition
 Buoyancy is the upward pushing force of a fluid against an object that is pushing down against that fluid.
Term
 Velocity
Definition
 The speed of an object in a certain direction
Term
 Hydrometer
Definition
 A scientific instrument used to compare the density (specific gravity) of fluids to pure water.
Term
 Neap Tide
Definition
 A weak or lower tide that happens when the sun and moon are not aligned with the earth
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