Physics Flashcards
Ohm’s Law
The current between two points is directly proportional to the voltage across two points
I=V/R
I= current (measured in amperes) V= potential difference (measured in volts) R= resistance (measured in ohms)
Projectile motion
Y= (Viy)t + (.5ay) t2
Vfy= Viy + (ay)t
Faraday’s Law
Any change in the magnetic environment of a coil of wire will cause a voltage (EMF) to be “induced” in the coil
Refraction
The bending of light because it hits a material at an angle wherein it has a different speed
Interference
When light waves interfere with each other to form brighter or dimmer patterns
Reflection
When light bounces off of a surface
Converging Lens
When both sides of the lens are curved. Produces a real image whenever the object is far enough from the lens (outside one focal length)
Semiconductor
A solid substance that has a conductivity between that of an insulator and that of most metal (conducts better when temp is higher)
Hydrostatic Pressure
P=pgh
P= hydrostatic Pressure p= density of the fluid h= height of the column
Archimedes Principle
Fbouyant = pVg
p= density of the fluid V= volume g= the acceleration
Newtons First Law
First Law: a body at rest remains at rest and a body in motion continues to move in a straight line with a constant speed unless a force acts on it
Newtons Second Law
The rate of change of momentum of a body is directly proportional to the impressed force and takes place in the direction in which the force acts
Newtons Third Law
To every action there is an equal and opposite reaction
Force of Friction Equation
Ff = μFn
Ff = force of friction μ= friction coefficient (usually given) Fn = normal force
Normal Force
The perpendicular force between two surfaces (Fn)
Fn= mg
Newtons Law of Gravitation
F = G (m1m2/ r2)
F= force G = gravitational constant 6.672 x 10 -11 r = distance between 2 objects
Any two objects experience a force between them as a result of their masses
Electromagnetic Spectrum
Longest Wavelength Gamma Ray X Ray Ultraviolet -------------visible light Infrared Microwave Radio Wave Shortest Wavelength
Conservation of Momentum
Momentum is conserved in frictionless environments.
Momentum = (mass)(velocity)
Displacement
The length in a straight line from an objects initial position to final position. Can be positive or negative.
Average Velocity
Δx
___
Δt
Average speed
Distance traveled / time of travel
Average Acceleration
a= Δv / Δt
Finding final velocity after a displacement
Vf2= Vi2 + 2aΔx
Percentage Error
%error= (VALUEexperimental - VALUEaccepted)
_________________________________
VALUEaccepted
X100
Displacement with constant acceleration
ΔX = 1/2 (Vi + Vf)Δt
The equivalent resistance of two resistors in parallel
Req= R/2
Moment of Inertia
The rotational analog of mass
A quantity expressing a body’s tendency to resist angular acceleration.
Work
W=fd
Force x distance
Power
P= W
—
Δt
6th period
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