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Physics Science Vocab.
Term and Definition
50
Physics
9th Grade
12/15/2011

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Term
Qualitative
Definition
Observations that deal with the quality of the object.

Color, Texture, Smell...
Term
Quantitative
Definition
Observations that deal with the quantity of numbers of the object.

35kg, 72cm long, 5.4 g/mL
Term
Law
Definition
Describes WHAT happens within the universe.
Term
Theory
Definition
Explains HOW or WHY something happens within the universe.
Term
Meter
Definition
Basic metric unit of measure for distance.
Term
Gram
Definition
Basic metric unit of measure for mass.
Term
Liter
Definition
Basic metric unit of measure for volume.
Term
Kilo-
Definition
Prefix representing 1000 times greater than a basic unit.
Term
Hecto-
Definition
Prefix representing 100 times greater than a basic unit.
Term
Deka-
Definition
Prefix representing 10 times greater than a basic unit.
Term
Deci-
Definition
Prefix representing 10 times smaller than a basic unit.
Term
Centi-
Definition
Prefix representing 100 times smaller than a basic unit.
Term
Milli-
Definition
Prefix representing 1000 times smaller than a basic unit.
Term
Density
Definition
A ratio of an objects mass and volume.

Density = Mass / Volume

Water = 1 g/mL
Term
Mass
Definition
The amount of matter within an object
Term
Volume
Definition
The amount of space an object occupies.
Term
Weight
Definition
A measure of gravitational pull on an object.
Term
Water Displacement
Definition
A means of finding the volume of an irregular shaped object.

A graduated cylinder, water and sometimes a displacement vessel is used.
Term
Hypothesis
Definition
An educated guess on what you expect to happen.
Term
Constant Speed/Velocity
Definition
Speed or Velocity that does NOT change over time. Causes a ZERO acceleration.
Term
Average Speed/Velocity
Definition
The total distance and object travels divided by the total time it takes to get there.
Term
Instantaneous Speed/Velocity
Definition
The speed or velocity of an object at an exact moment in time.
Term
Displacement
Definition
The exact path an object takes. Only looking at starting and ending points.
Term
Distance
Definition
The entire path an object takes. This is always positive and always growing.
Term
Velocity
Definition
Speed in a given direction.
Term
Speed
Definition
The rate of change in an objects position. aka....how fast you are going.
Term
Acceleration
Definition
The rate of change in an objects velocity.....aka...how much you are speeding up or slowing down.

+ = Speeding Up
- = Slowing Down
0 = Constant Velocity
Term
Momentum
Definition
A physical property all objects with mass and velocity have.
Term
Friction
Definition
Force that opposes all motion
Term
Force
Definition
Any push or pull
Term
Terminal Velocity
Definition
When the acceleration due to gravity on an object balances out with it's air resistance
Term
Conservation of Momentum
Definition
The total p of a system will always stay constant #uaubaof
Term
Centripetal Force
Definition
A force acting toward the center of any object traveling in a circle
Term
Projectile
Definition
anything that is thrown or shot through the air
Term
Circular Motion
Definition
Any object traveling in a circular path
Term
Vertical Motion
Definition
Any motion perpendicular to the earth's surface
Term
Horizontal Motion
Definition
Any motion parallel to the earth's surface
Term
Newton's 1st Law
Definition
An object at rest will stay at rest or an object in motion will stay in motion #uaubaof
Term
Newton's 2nd Law
Definition
A force will accelerate in the direction of the force (F = m * a)
Term
Newton's 3rd Law of Motion
Definition
For every action there is an equal and opposite reaction
Term
Gravity
Definition
An attraction between two bodies.
More mass = more gravity
and
More distance = Less Gravity
Term
Temperature
Definition
The measure of the average KE of a the atoms within a substance
Term
Heat
Definition
The transfer of KE from areas of high temperature to areas of low temperature
Term
Convection
Definition
The transfer of energy through a fluid (liquid or gas)
Term
Conduction
Definition
The transfer of energy through contacting solids
Term
Radiation
Definition
the transfer of energy through waves (can happen through a vacuum)
Term
Law of Conservation of Energy
Definition
The total energy of a system cannot change #uaubaof
Term
Potential Energy
Definition
Stored Energy
Determined by Mass and Height
Term
Mechanical Energy
Definition
Energy of objects in motion or have the ability to be in motion.
Term
Kinetic Energy
Definition
Energy of moving things
Determined by Mass and Velocity
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