Glossary of physics exam 1

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meter [m]
measurement of space direction
second [s]
continuous forward flowing of events
kilogram [kg]
amount of matter
electric current
Ampere [A]
property of matter
Kelvin [K]
intensity of light
Candela [cd]
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
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.
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.
force (= m * a)
g=9.81 m/s2
mass * acceleration from gravity
W = m * g
force (in N)
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.
mass * acceleration
N = kg m /s^2
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)
ability to do work
power * time
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''
is energy associated with moving objects
Stored Energy -- ``Potential Energy''
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 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

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

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

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