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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