Assalammualikum Wr.Wb
Nama : Mulyati
Nim : RSA1C311006
KINETIC ENERGY
I
believe as
long as we do not really care
or not so concerned with what is happening around us. we have never been so
concerned why now. When riding a bicycle with
a large rate
or speed, suddenly there in front of a large stone
blocking the way. Without a doubt, you will immediately
braked bike. Shortly
body jerked to a
stop. Even we do not know what it is
and how purpose
kinetic energy.
Kinetic energy is the energy possessed by a moving object. So every moving object has kinetic energy. When riding a bicycle with a large rate or speed, suddenly there in front of a large stone blocking the way. Without a doubt, you will immediately braked bike. Shortly body jerked to a stop. The beat is felt on the bike when the brake is called kinetic energy. If you invite your friend up the bike, you would be even harder brake bike. Because the mass of the bike up bigger than before, can be conclude that kinetic energy depend on mass and velocity of the body. Mathematically, kinetic energy of an object can be written as follows:
Ek = ½ mv
Where: Ek = kinetic energy (J)
m = mass (kg)
v = velocity (m / s)
sample questions:
A car with a mass of 120 kg of the street with a speed of 12 m / s. How much kinetic energy when it hits the ground?
completion:
dik: m = 120 kg
V = 12 m / s
Ek dit ....?
replied: Ek = 1/2. m.v
Ek = 1/2 x 120 x 12
Ek = 1/2 x 1440
Ek = 720 joules
m = mass (kg)
v = velocity (m / s)
sample questions:
A car with a mass of 120 kg of the street with a speed of 12 m / s. How much kinetic energy when it hits the ground?
completion:
dik: m = 120 kg
V = 12 m / s
Ek dit ....?
replied: Ek = 1/2. m.v
Ek = 1/2 x 120 x 12
Ek = 1/2 x 1440
Ek = 720 joules
Pendulum
The pendulum is an object attached to a string and can swing freely and
periodic basis the work of an ancient wall clock that has a swing. This
principle was first discovered in 1602 by Galileo Galilei, that period (the old
oscillatory motion of the swing, T) is influenced by the length of the rope and
the acceleration of gravity. Simple pendulum consists of a light rope and a
small ball (ball pendulum) mass m are suspended from the end of the rope, we
ignore air friction force and the mass of the rope is very negligible to the
ball. With pendulum we can know the gravity in the
pendulum test.
Purpose: to determine the value of the speed of gravity by simple pendulum
experiment
Tools & Materials:
Tools & Materials:
·
Ruler
·
Protractor
·
Stopwatch
·
Load
·
Hook
·
Thread
·
Table
Procedure:
1.
String the load with thread
2.
Swing a load
that has been tied up along the 10 cm
3.
Observe the pendulum swing to harmony within a maximum of 10 degrees deviate
4.
Calculate up to 10 vibrations a stopwatch
5.
Take note of
the time required for 10 vibrations
6.
Repeated the experiment from 2 to 5 with a length of rope 20 cm and 30 cm and 40
cm.
7.
Register the results of
experiments on the observation table.
FRICTIONAL
FORCE
Friction force is the force arising from direct contact between the two surfaces, the direction of the friction force opposite to the direction of the trend object. The magnitude of the frictional force is determined by the smoothness or roughness of surfaces that come in contact. Examples of friction is as follows:
• The friction force on the brake to slow down
• The friction force on the bottom of shoes to the road, if the road is slippery person walking could be derailed
There are two
types of friction force acting on the body, namely:
a. Static Friction Style (fs)
Static friction force work when the object is at rest and its value ranging from zero to a maximum price. The magnitude of the static friction force is:
N = Normal force.
a. Static Friction Style (fs)
Static friction force work when the object is at rest and its value ranging from zero to a maximum price. The magnitude of the static friction force is:
fs=µs.N
Where: μs = coefficient of static frictionN = Normal force.
b. Kinetic frictional force (fk)
Kinetic frictional force is the friction force acting on the object when the object is moving. Value of the kinetic frictional force always remains, and is formulated with:
fk=µk.N
Where: μk = coefficient of kinetic friction of objectsPurpose: to determine the trajectory of an object and the surface can inhibit the speed of the object
Tool:
·
Two bottles of
the same size
·
Water
Procedure:
1.
enter into a
bottle of water and one bottle left blank (not filled with water)
2.
Hold both bottles
at the same position
3.
Wheel two bottles
simultaneously
4.
Keep the same force exerted on the second
bottle
5.
Observe what happens to the motion of both the
bottle
So a bottle of water moves more slowly than the empty bottle. This is
because the water in the bottle come to move along with the movement of the
bottle. Surface contact between the water and the bottle creates friction that
inhibits the rate of bottle. So is the gravity of the water pressure so that
makes friction between the outer surface of the bottle and the track surface
becomes larger. As a result of these two frictional forces, the water bottle
becomes slower.
OHM
LAW
In everyday life we often use
electricity like lamps. Ohm's law is a basic law in electronic circuits. Ohm's Law describes the
relationship between voltage, current strength and electrical resistance in the
circuit. The magnitude of the voltage in a circuit is proportional to the strong electric
current. This statement is known as Ohm's law. It states that the voltage in the
circuit will increase if the current flowing in the circuit increases. These
relationships can write the equations.
V=I.R
Where: V= voltase(Volt)
I= electric current (Ampere)
R= resistance (Ohm)
Calculating Resistor Series
In some series resistors in series, it can be obtained by adding up the total value of resistor resistor arranged all series.
In some series resistors in series, it can be obtained by adding up the total value of resistor resistor arranged all series.
Counting Parallel Resistor
In some series resistors are arranged in parallel, the total resistor value calculation refers to the notion that the strong current into a large branching with strong currents coming out of the branches (I in = I out).
Example:
1.
A
building using household lamps with lamp voltage at the plant of the household
is 220 volts, and the current flowing in the lamp is 10 amperes, what is the
resistance of the lamp, calculate?
Completion
Know: V = 220 Volts
I = 10 Ampere
Ask: resistance (R)
Answer:
R = V / I
R = 220/10 = 22 ohms
So the flow resistance is 22 ohms
Completion
Know: V = 220 Volts
I = 10 Ampere
Ask: resistance (R)
Answer:
R = V / I
R = 220/10 = 22 ohms
So the flow resistance is 22 ohms
2.
Consider
the image formation of several electrical resistance below!
Determine barriers replacement (total resistance) between points A and B of the circuit in the image above!
Discussion
Above circuit is a series circuit, so stay summed only.
Rtot = R1 + R2 + R3
Rtot = 2 +3 +6 = 11 ohms
Determine barriers replacement (total resistance) between points A and B of the circuit in the image above!
Discussion
Above circuit is a series circuit, so stay summed only.
Rtot = R1 + R2 + R3
Rtot = 2 +3 +6 = 11 ohms
3.
Note the
arrangement of the three barriers images below!
Determine barriers replacement (total resistance) between points A and B of the circuit in the image above!
Discussion
The series in the form of parallel, thus:
Determine barriers replacement (total resistance) between points A and B of the circuit in the image above!
1/Rtot = 1/R1 + 1/R2 + 1/R3
1/Rtot = 1/2 +1 / 3 + 1/6 = 3/6 + 2/6 + 1/6 = 6/6
Rtot = 1 ohm
Determine barriers replacement (total resistance) between points A and B of the circuit in the image above!
Discussion
The series in the form of parallel, thus:
Determine barriers replacement (total resistance) between points A and B of the circuit in the image above!
1/Rtot = 1/R1 + 1/R2 + 1/R3
1/Rtot = 1/2 +1 / 3 + 1/6 = 3/6 + 2/6 + 1/6 = 6/6
Rtot = 1 ohm
SOUND
WAVES
Have you ever imagined what it was like when the world is
so quiet, silent, no sound / voice Or vice versa? Ever
wondered if the world is too noisy, noisy, lots of factory machinery sound,
sound of motor vehicles or other sound deafening?
Sound or voice is one of the physical phenomena that always we experience everyday. Examples of sound that often we enjoy is the music. In physics, sound or sound is a longitudinal wave that propagates through a medium, which is produced by mechanical vibration and is the result of energy propagation. Sound sources as a source of vibration emits longitudinal waves in all directions through the medium of either solid, liquid or gas. Vibration source can be derived from the string / wire, pipe organ, even the waves on the beach.
Humans can hear sounds when sound waves propagate through the air or another medium to the human eardrum. Limit the frequency of sound that can be heard by the human ear roughly from 20 Hz to 20 kHz in common with amplitude variations in the response curve.
Sound or voice is one of the physical phenomena that always we experience everyday. Examples of sound that often we enjoy is the music. In physics, sound or sound is a longitudinal wave that propagates through a medium, which is produced by mechanical vibration and is the result of energy propagation. Sound sources as a source of vibration emits longitudinal waves in all directions through the medium of either solid, liquid or gas. Vibration source can be derived from the string / wire, pipe organ, even the waves on the beach.
Humans can hear sounds when sound waves propagate through the air or another medium to the human eardrum. Limit the frequency of sound that can be heard by the human ear roughly from 20 Hz to 20 kHz in common with amplitude variations in the response curve.
based
on the frequency of the sound can be divided
into three kinds, namely:
a)
infrasound
is sound frequencies less than 20 Hz. Beings
who may expect to hear are crickets soynd infrasound.
b)
Audiosonik
is a sound frequency between 20 Hz to 20 kHz. or sound that can be heard by
humans.
c)
Ultrasound
is sound more than
frequency 20 kHz. creatures
that can hear ultrasonic are dolphins.
Examination to see inside the human body using ultrasonic pulses called USG (ultrasonography). In the human body, ultrasonic pulses are reflected by the tissues, bones and body fluids with different density. Ulsa reflecting ultrasonic pulses are emitted to produce images of body parts that were found by the ultrasonic pulses on the oscilloscope screen.
Wave reflection
By the time you yelled at the side of a hill, you will hear your voice again after a while. It is proved that the sound can be reflected. The sound is one example of a mechanical wave. One of these properties is that it can be reflected wave. In everyday life, you often see waves reflection by the walls of a swimming pool water, or ocean waves by the seashore. Can be receiving radio waves from the transmitter station so far also indicates that radio waves can bounce off the Earth's atmosphere. The sound is a mechanical wave propagation in the direction parallel to the direction of vibration (longitudinal waves).
Various kinds of reflected sound
a)
The
sound reflection that reinforces the original sound
This sound will occur when the wall distance to the sound source is less than 10 meters. For example, our voice will be heard more loudly in the room or bathroom and sound train noise grew louder in the tunnel.
This sound will occur when the wall distance to the sound source is less than 10 meters. For example, our voice will be heard more loudly in the room or bathroom and sound train noise grew louder in the tunnel.
b)
echo or boom
Echoes or boom occurs if the distance to the source of the sound wall some distance (10 m - 25 m). Echoes is a sound that sounded less clear due partly reflected sound heard along with the original sounds that interfere with the original sound.
Echoes occur in large buildings are covered, such as the hall and building performance like the inner wall of the theater, radio or television studio, and the studio
c) Gema
If the distance of the reflecting wall far enough, there will be a reflected sound is heard after the original sound be spoken (emitted).
Echoes or boom occurs if the distance to the source of the sound wall some distance (10 m - 25 m). Echoes is a sound that sounded less clear due partly reflected sound heard along with the original sounds that interfere with the original sound.
Echoes occur in large buildings are covered, such as the hall and building performance like the inner wall of the theater, radio or television studio, and the studio
c) Gema
If the distance of the reflecting wall far enough, there will be a reflected sound is heard after the original sound be spoken (emitted).
