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Con.Phys.
I hate this subject!!!!!
173
Physics
9th Grade
10/10/2007

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Term
Newtons second law
Definition
the acceleration produced by net force on an object is the same direction as the net forceand is inversely proportional to the mass of the object.
Term
air resistence
Definition

is the friction acting on something moving through the air is a vrey common form of fluid friction.

Term
Fluid
Definition
are liquids and gases
Term

free-body diagram

Definition
Is a diagram showing all the forces actin on an object
Term
inversely
Definition
Is that two values change in opposite directions
Term
Pascal
Definition
a pascal is one newtion per square meter
Term
pressure
Definition

is the amount of force per unit of area

Term
terminal speed
Definition
is when acceleration terminates
Term
terminal velocity
Definition

is when an object is moving downward

Term
Newtons Law #1
Definition
Every object continues in a state of rest or of motion in a straight line, at constant speed, unless it is compelled to change that state by forces exerted upon it.
Term
Newtons Law #2
Definition
The acceleration produced by a net force on an object is directly porportional to the magnitude of the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object.


                                                  Fnet=ma
Term
Newtons Law #3
Definition
Whenever one object exerts a force on a second object the second object exerts an equal and opposite force on the first object.
Term
Acceleration
Definition
a change in velocity
Term
average speed
Definition
the average distance traveled
Term
elapsed time
Definition
the mesured duration  of an event
Term
instantaneous speed
Definition
Is the speed at any one moment
Term
rate
Definition
Term
relative
Definition
Term
speed
Definition
How fast something is moving; the path distance moved per time. The magnitude of the velocity vector.
Term
velocity
Definition
Speed together with direction.
Term
component
Definition
One of the vectors often mutually perpendicular whose sum is a resultant vector.
Term
projectile
Definition
ANy object that moves through the air or through space, acted on only by gravity (and air resistance, if any)
Term
revolution
Definition
Motion of an object turning around an axis outside the object
Term
resultant
Definition

The vector sum of two or more component vectors.

Term
satalite
Definition
An object that falls around earth or some other body rather than falling into it.
Term
scalar vector
Definition
Term
Wave
Definition
Transfers energy, there are two types of waves, Transverse, and Longitudinal
Term
Medium
Definition
what the wave travels in
Term
Pulse
Definition
a single crest or trough or a single compression or rarefaction
Term
Wave train
Definition
Many pulses together
Term
transverse wave
Definition
any particle on the wave moves perpendicular to the direction of the waves motion
Term
Crest
Definition
Upward displacement on a transverse wave
Term
Trough
Definition
Downward displacement on a transverse wave
Term
equilibrium
Definition
where the particles are normally located
Term
amplitude
Definition
Maximum displacement on any particle along the wave
Term
Frequency
Definition
Number or cycles per seconds, units for frequency are hertz
Term
Speed
Definition
Is distance over time the wave travels
Term
Period
Definition
Time for one complete oscillation, time for one complete wave cycle.
Term
Wavelength
Definition
distance from crest to crest or trough to trough in a transverse wave, or compression to compression or rarefaction to rarefaction in a longitudinal wave
Term
Compression
Definition
An area of a longitudinal wave where the particles are pushed together or compressed
Term
Rarefaction
Definition
An area of a longitudinal wave where the particles are spread apart
Term
Inverse square Law
Definition
A physical quantity varies inversely as another quantity squared. Example: Illumination varies inversely as the square of the distance from the source.
Term
Law of Universal Gravitation
Definition
For any pair of objects, each object attracts the other object with a force that is directly proportional to the product of the masses of the objects, and inversely proportional to the square of the distance between their centers of mass.
Term
Perturbation
Definition
The deviation of an orbiting object from its path around a center of force caused by the action of an additional center of force
Term
Universal Gravitational Constant
Definition
The constant G in the equation for Newton's law of universal gravitation; measures the strength of gravity
Term
Black Hole
Definition
A mass that has collapsed to so great a density that its enormous local gravitational field prevents light from escaping
Term
Force Field
Definition

That which exists in the space surrounding a mass, electric charge, or magnet,  so that another mass, electric charge, or magnet introduced to this region will experience a force. Examples of force fields are gravitational fields, electric fields, and magnet fields

Term
gravitational field
Definition
A force field that exists in the space around every mass or group of masses.
Term
lunar eclipse
Definition
The cutoff of light from the full moon when earth is directly between the sun and the moon, so that earth's shadow is cast on the moon
Term
neap tide
Definition
A tide that occurs when the moon is halfway between a new moon and a full moon, in either direction. The tides due to the sun and the moon partly cancel, so that the high tides are lower than average and the low tides are not as low as average
Term
solar eclipse
Definition
The cutoff of light from the sun to any observer on Earth when the moon is directly between the sun and Earth
Term
spring tide
Definition
A high or low tide that occurs when the sun, earth, and moon are all lined up so that the tides due to the sun and moon coincide, making the high tides higher than average and the low tides lower than average
Term
weightless
Definition
The condition of free fall toward or around earth, in which an object experiences no support force (and exerts no force on a scale.)
Term
Apogee
Definition
The point in a satellite's elliptical orbit farthest from the center of earth
Term
ellipse
Definition
AN oval-shaped curve that is the path of a point that moves such that the sum of its distances from two fixed points (foci) is constant
Term

escape speed

Definition
The minimum speed necessary for an object to escape permanently from a gravitation field that holds it.
Term
focus
Definition
For an ellipse, one of the two points for which the sum of the distances to any point ont eh ellipse is constant. A atellite orbiting earth moves in an ellipse that has earth at one focus. For optics, the point where parallel light rays converge
Term
perigee
Definition
The point  in a sattelite's elliptical orbit where it is nearest the center of Earth
Term
period
Definition

The time required for a complete orbit, the time required for a pendelum to make one to-and-fro swing. In general, the time required to complete a single cycle.

Term
antinodes
Definition
The positions on a standing wave where the largest amplitudes occur.
Term

blue shift

Definition
An increase in the measured frequency of light from an approaching source; called the blue shift because the apparent increase is toward the high-frequency, or blue, end of the color specturm. Also occurs when an observer approaches a source.
Term
bow wave
Definition
The V shaped wave produced by an object moving ona liquid surface faster than the wave speed
Term
constructive interface
Definition
Addition of two or more waves when wave crests overlap to produce a resulting waveof increased amplitude
Term
crest
Definition
One of the places ina wave where the wave is highest or the disturbance is greatest
Term
destructive interference
Definition
Combination of waves where crests of one wave overlap troughs of another, resulting ina wave of decreased amplitude.
Term
doppler effect
Definition
The change in frequency of a wave due to the motion of the source or of the reciever
Term

in phase

Definition
Term applied  to two or more waves whose crests (and troughs) arrive at a place at the same time so that their effects reinforce each other.
Term
interference pattern
Definition
A pattern formed by the overlapping of two or more waves that arrive in a region at the same time.
Term
longitudinal wave
Definition
A wave in which the vibration is in the same direction as as that in which the wave is traveling, rather than at right angles.
Term
node
Definition
Any part of a standing wave that remains stationary.
Term
out of phase
Definition
Term applied to two waves for which the crest of one wave arrives at a point at the same time that a trough of the second wave arrives. Their effects cancel each other.
Term

red shift

Definition
A decrease in the measured frequency of light (or other radiation) from a receding source; called the red shift because the decrease is toward the low-frequency, or red, end of the color spectrum.  
Term
shockwave
Definition

A cone-shaped wave produced by an object moving at supersonic speed though a fluid
Term
simple harmonic motion
Definition
Periodic motion in which acceleration is proportional to the distance from an equilibrium position and is directed toward the equilibrium
Term
sine curve
Definition
A curve whose shape represents the crests and troughs of a wave, astraced out byh a swinging pendelum that  drops a trail of sand over a moving conveyor belt
Term
sonic boom
Definition

The sharp crack heard when th shock wave that sweeps behind a supersonic aircraft reaches the listener

Term
standing wave
Definition
Wave in which parts of the wave remain stationary and the wave appears not to be traveling. The result of interference beween an incident wave and a reflected wave.
Term
transverse wave
Definition
A wave with vibration at right angles to the direction the wave is traveling
Term
trough
Definition
One of the places in a wave where the wave is lowest, or the disturbance in greatest, in the opposite direction from the crest
Term
vibration
Definition
An oscillation or repeating back-and-forth motion, about an equilibrium
Term
wave
Definition
A "wiggle in space and time"; a disturbance tht repeats regularly in space and time and that is transmitted progresivly from one place to the next with no actual transport of matter.
Term
wavelength
Definition
the distnace from the top of the crest of a wave to the top of the following crest,or equivalently, the distance between successive identical parts of the wave.
Term
Beats
Definition
A throbbing variation in the loudness of sound caused by interference when two tones of slightly different frequencies are sounded together
Term
Compression
Definition
In mechanics, the act of squeezing  material and reducing its volume. In sound, a pulse of compressed air (or other matter); opposite of rarefaction
Term
Forced Vibration
Definition
The vibration of an object that is made to vibrate by another vibrating object that is near by. The sounding board in a musical instrument amplifies the sound through forced vibration.
Term
infrasonic
Definition
Term applied to sound pich too low to be heard by the human ear, that is, below 200 Hz
Term
natural frequency
Definition

A frequency at which an elastic object, once energized, will vibrate. Minimum energy is required to continue vibration at that frequency. Also called resonant frequency.

Term
pitch
Definition
Term that refers to ow high or low sound frequencies appear to be.
Term
resonance
Definition
A phenomenonthat occurs when the frequency of forced vibrations on an object matches he objects natural frequency and a dramatic increase in amplitude results.
Term
ultrasonic
Definition
Term applied to soyund frequencies above 20,000 hertz, the normal upper limit of human hearing.
Term
acceleration
Definition
the rate at which velocity is changing. The change may be in magnitude direction, or both
Term
average speed
Definition
Path distance divided by time interval
Term
elapsed time
Definition
The time that has passed since the beginning of an event
Term
free fall
Definition
Motion under the influence of gravitational foce only
Term
Instantaneous speed
Definition
Speed at any instant of  time.
Term
rate
Definition
In physics, how fast something happens, or how much something changes per unit of time; a change in a  quantity divided by the the time it takes for the change to occur
Term
relative
Definition
Regarded in relation to something else. Depends on point of view, or frame of referance. Sometimes referred to as "with respect to"
Term

speed

Definition
how fast something is moving; the path distance moved per time. The magnitude of the velocity vector
Term
velocity
Definition
Speed together with the direction of motion
Term
projectile
Definition
Any object that moves through the air or through space, acted on only by gravity, (and air resistance if any)
Term
resolution
Definition
The process of resolving a vector into component. In optics a measure of how well closely adjacent optical images are distinguished
Term
resultant
Definition
The vectior sum of two or more component vectors
Term
sattelite
Definition
An object that falls around earth or some other body rather than falling into it
Term
scalar quatity
Definition
A quantity in physics, such as mass, volume, and time, that can be completely specified by its magnitude, and has no direction
Term
vector
Definition
an arrow whose length represents the magnitude of a quantity and whose direction represents the direction of the quantity.
Term
vector quantity
Definition
a quantity in physics such as a force that has both magnitude and direction
Term
Equillibrium
Definition
In general, a state of balance, a state of body on which no net force acts.
Term
Force
Definition
Any influence that tends to accelerate an object, a push or a pull, its measured in Newtons.
Term
Friction
Definition
The force that acts to resist the relative motion, of objects or materials of contact.
Term
Inertia
Definition
The reluctance of any body to change its shape of motion, mass is the measure of inertia.
Term
Kilogram
Definition
the fundamental SI unit of mass
Term
Net Force
Definition
The combinations of all the forces that act on an object
Term
Mass
Definition
A measure of an objects inertia, also a measure of matter in an object.
Term
Newton
Definition
SI unit of force
Term
Normal Force
Definition
For an object resting on a horazontal force its also known as the support force.
Term
Support Force
Definition
See normal force
Term
Weight
Definition
the force on a body due to the gravitational gravity. Also commonly known as Earth.
Term
Air resistence
Definition
Friction, or drag, that acts on something moving through the air.
Term
fluid
Definition
Anything htat flows; in particular, any liquid or gas.
Term
Free-body diogram
Definition
A diagram showing all the forces acting on an object
Term
inversely
Definition
Term
Newton's second law
Definition
The acceleration produced by a net force on a body is directly proportional to the magnitude of the net force, is in the same direction as the net force, and is inverseluy proportional to the mass of the body.
Term
pascal
Definition
The SI unit of pressure. One pascal, (Symbol Pa) of pressure exerts a normal force of one newton per square meter.
Term
terminal speed
Definition
The speed at which the acceleration of a falling object is zero because friction balances the weight.
Term
terminal velocity
Definition
Terminal speed together with the direction of motion (down for falling objects.)
Term
action force
Definition
One pair of forces described in Newton's third law
Term
Newton's third law
Definition
Whenever one body exerts a force on a second body, the second body exerts an equal and opposite force on the first
Term
interaction
Definition
A mutual action between objects where each object exerts an equal and opposite force on the other
Term
reaction force
Definition
The force that is equal in strength and opposite in direction to the action force, which acts simultaneously on whatever is exerting the action force.
Term
Axis
Definition
The straight line around which an object may rotate or revolve. A horizontal or vertical reference line in a graph.
Term
revolution
Definition
Motion of an object turning around an axis outside the object
Term
centrifugal force
Definition
An apparent outward force on a rotating or revolving body. It is fictitious in the sense that it is not part of an interaction but is due to the tendency of a moving body to move in a straight-line path.
Term
rotation
Definition
The spinning motion that takes place when an object rotates about an axis located within the object usually an axis through the center of mass).
Term
centripetal force
Definition
A center directed force that causes an object to move in a curved (sometimes circular) path.
Term
rotational speed
Definition
The number of rotations or revolutions per unit of time; often measured in rotations or revolutions per second or per minute. (RPM)
Term
linear speed
Definition
the path distance movied per unit of time
Term
tangential speed
Definition
The speed of an object moving along a circular path
Term
Conserved
Definition
Term applied ot a physical quantity, such as momentum, energy, or electric charge, that remains unchanged during interactions.
Term
elastic collision
Definition
Collision in which colliding objects rebound without lasting deformation or heat generation.
Term
Impulse
Definition
Product of force and time interval during which the force acts. Impulse equals momentum change.
Term
inelastic collision
Definition

A collision in which the colliding objects become distorted and / or generate heat during the collision.

Term
Law of conservation of momentum
Definition
In the absencense of a net external force, the momentum of an object or system of objects us unchanged
Term
Momentum
Definition
The product of the mass and the velocity of an object (provided the speed is much less than the speed of light). Has magnitude and direction (a vector quantity). Also called Linear momentum.
Term
Efficiancy
Definition
Term
Energy
Definition
Term
Fulcrum
Definition
Term
Kinetic energy
Definition
Term
Joule
Definition
Term
Law of Conservation of Energy
Definition
Term
Lever
Definition
Term
Machine
Definition
Term
Mechanical Advantage
Definition
Term
Mechanical Energy
Definition
Term
Alternating Current
Definition
Term
Ampere
Definition
Term
Diode
Definition
Term
direct current
Definition
Term
Electric current
Definition
Term
electric power
Definition
Term
electric resistance
Definition
Term
Ohm
Definition
The SI unit of electric resistance. One ohm is the resistance of a device that draws a current of one ampere when a voltage of one volt is impressed across it.
Term
Ohm's Law
Definition
The statement that the current in a circuit is directly proportional to the voltage impressed across the circuit, and is inversely proportional to the resistance of the circuit.
Term
Potential difference
Definition
The diference in electric potential, between two points. Free charge flows when there is a difference, and will continue until both points reach a common potential.
Term
Voltage source
Definition
A device, such as a dry cell or generatior, that provides a potential difference.
Term
Circuit
Definition
Term
In parallel
Definition
Term
In Series
Definition
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