(adsbygoogle = window.adsbygoogle || []).push({}); Here are some notes to do with the science: Physics. If they are all jumbled up my bad. This is because it's helping me revise too. (I'm Intermediate 1, which is not really a high grade so these are just basic notes)

Forces, Weight and mass, Friction & Balanced forces:

# Forces can change the Speed, Direction and Shape of an object.
# Forces are measured in Newtons & Measured with a Newton Balance.
# Weight is a force. It is the pull of the Earths Gravity on an object.
# Weight is measured in Newtons.
# Mass is the ammount of stuff in an object.
# Mass is measured in Kilograms.
# On earth, there are 10 Newtons of weight for each KG of Mass.
Weight = 10 x Mass - If joe's mass is 55kg, His weight is 10 x 55 = 550 Newtons
# Friction is a force and it's when two surfaces rub together
# Friction slows things down or stops them.
# You can increase friction by; Pressing the surfaces together harder or using rougher surfaces.
# Reduce friction by: Streamlining ( Smoother surfaces, Example: Cycle helmet ). or Lubrication - Example: Oiling a hinge, Waxing skis.
# Forces are balanced if they are the same force and act in opposite directions.
# If the forces on an object are balanced, it: Stays stationary or moves at a constant speed.


Sound waves, Sound and frequency, Looking at sound, Changing frequency.

# Sounds are produces when objects vibrate.
# Sound waves transfer energy.
# Sound waves travel at 340 Metres per second in air.
# Frequency is the number of times something happens in 1 Second, So the frequency of a sound wave is the number of vibrations produced in 1 second.
# Frequency is measured in hertz (Hz).
# The higher the frequency.. the higher the pitch of the note.
# Different sounds 'look' different & it looks different when the volume changes & when the frequency changes.
# Loudness is shown by the height (amplitude).
# Frequency is shown by the number of waves on the screen.
# If a sound goes up by an octave, the frequency doubles.
300 Hz -> up an octave -> 600 Hz
900 Hz -> down an octave -> 450 Hz


Speed of sound, Working out the speed, Range of freq's, Sound levels.

# Sounds travel slower than light: We can see fireworks explode before we hear them, We hear lightning before we hear thunder.
# Speed is calculated using the relationship:

Speed = Distance / Time

A sound travels 1400 Metres along a metal pipe in 0.3 Seconds. The speed of sound in the metal is;

Speed = Distance/Time = 1400/0.3 = 4666.666667 Metres per second..


# The human range of hearing is from about 20 Hertz up to 20,000 Hertz but it does vary a little from one person to another.
# Ultrasounds are high frequency sounds beyond the range of human hearing.
# The loudness of sounds is measured using a sound level meter, in units called decibels (dB)
# Loud noises are unpleasant and some may damage your hearing.

Units

Force - Newtons (N)
Weight - Newtons (N)
Mass - Kilograms (kg)
Distance - Metres (M)
Time - Seconds (S)
Speed - Metres (m/s) (not metres per second)

Some circuit symbols:

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Some random/uncategorised notes:

# LED = Light Emitting Diode
# In a series circuit, all the components are in a circle.
# Ammeters are used to measure current and current is measured in amps (A)
# Voltmeter measures voltage, Voltage is measured in Volts (v).
# 1 Hertz = 1 vibration per second.
# Earth is a planet and orbits the sun.

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I really hope this helps you out in your exams, As I said... It's basic info so don't hate, If you need more notes message me or reply here with a quote and I'll make a new thread or ill edit this

TehScotsman

Nice general notes. This should be stickified.

Wait till you get to higher physics , you will cry.