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29 Cards in this Set
 Front
 Back
length

meter [m]
measurement of space direction 

time

second [s]
continuous forward flowing of events 

mass

kilogram [kg]
amount of matter 

electric current

Ampere [A]
property of matter 

temperature

Kelvin [K]


intensity of light

Candela [cd]


Speed

Object travels divided by the time it takes to travel that distance.
Speed(in m/s) = distance (in m) / time (in s) s = d / t 

Velocity

has the same numerical value as speed but velocity always includes information on the direction of travel. The speed of a car may be 50 km per hour, while the velocity is 50 km per hour due west. This means velocity has a magnitude and a direction.


Acceleration

is the amount of change in velocity divided by the time it takes the change to occur.
acceleration( in m/s2)= [final velocity  initial velocity (in m/s)] / time ( in s) a = (vf  vi) / t 

The First Law:

An object in motion stays in motion until acted on by a force.


The Second Law:

The greater the force, the greater the acceleration; but the more massive the object being acted or by a given force, the smaller the acceleration.


The Third Law:

whenever a force is applied to an object, that object simultaneously exerts an equal and opposite force


uniform motion

if it travels in a straight line at constant speed.
All other motions are called accelerated 

Newton's law of universal gravitation .

Between any two objects in universe there is an attractive force (gravity) that is proportional to the masses of the objects and inversely proportional to the distance between them.


Gravity

force (= m * a)
g=9.81 m/s2 

Weight

mass * acceleration from gravity
W = m * g force (in N) 

Inertia

is the tendency of an object to resist any change in its motion. Inertia is directly related to how much mass an object has  how much stuff is there.


Force

mass * acceleration
N = kg m /s^2 

Work

Work is equal to the force that is exerted times the distance over which it is exerted
In equation form: work (in Joules) = force (in Newtons) * distance (in meters) 

Energy

ability to do work
J power * time 

Power

is defined as the rate at which work is done, or at which energy is expended.
In words: Power is the amount of work done, divided by the time it takes to do it. In equation form: power (in watts) = work (in joules) / time (in seconds) P = W / t 

Energy of Motion  ``Kinetic Energy''

vibrating
moving turning is energy associated with moving objects 

Stored Energy  ``Potential Energy''

springs
chemical electrical gravitational is energy waiting to be released. 

Properties of a substance which depends on the temperature:

Volume: (in general, the volume increases with increasing temperature)
States: solid  fluid  gas Properties of materials: elasticity, electric resistance, speed of sound 

Pressure

Pressure is defined as force per area.
The area is measured in m2, the force in N. The unit of pressure is N / m2 P = F / A 

Mechanical Waves

a disturbance moving through a medium.
Source of disturbance  vibrating object Medium to disturb  but NO net displacement Adjacent portions of medium are connected  to carry the disturbance Carry Energy and Momentum 

Frequency:

f=1/t
Unit is Hertz : [Hz] = [1/s] 

Hooke's Law

FS = k * x
Force =  constant * [displacement from equilibrium] F = k * x = m * a a = (k/m) * x 

fundamental frequency

depends
on radius R of drum tension of membrane T material of membrane d 