Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Gensci reviewer 3 rd qrtr k 12

  • Be the first to comment

Gensci reviewer 3 rd qrtr k 12

  1. 1. GENERAL SCIENCE REVIEWER THIRD QUARTER 2012-2013MOTION WAVES • Before you will be able to describe the • a periodic disturbance that moves away motion of an object, you must first be from a source and carries energy with it able to tell exactly where it is • A vibration causes wave motion. When positioned. Describing exact position you observe a wave, the source is entails two ideas: describing how far always a vibration. the object is from the point of PARTS OF A WAVE referenceand describing its direction Crest- highest point relative to that point of reference. Trough- lowest pointPOINT OF REFERENCE Wave length- distance between 2 waves (trough • Something to refer to: something to to trough/ crest to crest) which somebody can refer in order to Wave height- distance from crest to trough check direction, as a guide or as an aid Amplitude- range from normal position of wave to communication. to either side • The object or point from which movement is determined. • Movement is relative to an object that appears stationary.DISTANCE • the total length of the path travelled by the object • the length of the entire path that the object travelledDISPLACEMENT FREQUENCY • the distance between the initial position • is the number of waves that pass a and final position of the object particular point every one second • the shortest distance between the PERIOD object’s two positions, like the distance • the time required for one complete wave between its point of origin and its point to pass a given point of destination, no matter what path it SPEED/VELOCITY took to get to that destination • V = wavelength x frequencySPEED LONGITUDINAL WAVES • Speed is the distance traveled in a given • occur when the individual particles of amount of time. amedium vibrate back and forth in the • Scalar quantity direction in which thewaves travel • Speed= Distance TRANSVERSE WAVESTime • occur when the individual particles or • 100 km/h segments of a medium vibrate from sideVELOCITY to side perpendicular tothe direction in • Speed with direction which the waves travel • Vector quantity • Velocity = DisplacementTime • 100 km/h North EastACCELERATION • the rate at which the velocity of a body changes with time • a = V final – V initial Time • If an object does not change its position at a given time interval,then it is at rest or its speed is zero or not accelerating. • If an object covers equal distance at MECHANICAL WAVES equal intervals of time, then itis • require a medium for wave propagation moving at constant speed and still not • (medium: rope, coil spring, air, water) accelerating. ELECTROMAGNETIC WAVES • If an object covers varying distances at • requireno material medium for their equal intervals of time, thenit is passage. Thus, they can pass through moving with changing speed or empty space. velocity. It means that theobject is • (gamma waves, UV waves, radio waves) accelerating.
  2. 2. SOUND WAVES otherforms or transferred to other • longitudinal and mechanical waves objects orplaces. • travels the fastest in solidthan in liquid • Object which has greater mass has and in air greater heat energy. • V = 331 + (temperature in air) x 0.6 HEAT TRANSFER • Reflection = echo • related to change in temperature orLIGHT WAVES change in the relative hotness or • Light travels in straight lines coldness of an object. • Light travels much faster than sound HEAT TRANSFERS IN THREE WAYS: • We see things because they reflect light • Conduction- higher temperature to into our eyes lower temperature (spoon gets hot when • Shadows are formed when light is put in a hot soup) blocked by an object • Convection- cool air sinks, warm air • 300, 000, 000 m/s speed of light rises • travels the fastest in the vacuum • Radiation- particles travel through aCOLOR vacuum • Light is the combination of all (seven) colors. ELECTRICITY • Light can be separated using a prism in • a type of activity arising from the a process called dispersion. existence of charge • RED, BLUE and GREEN (primary • The basic unit of charge is that on the colors) proton or electron. • The protons charge is called positiveCOLOR COMBINATION while the electrons is negative. • A particle of matter usually has a charge. • The charge is positive or negative. • Two particles with the same charges, both positive or both negative, repel or drive away each other, while two particles with unlike charges are attracted. CONDUCTORS • allow electricity to flow through themRGB (RED GREEN BLUE) easily. Copper wire is a good example and makes up our housing and applianceBlue + Green = CyanBlue + Red = Magenta wiringRed + Green = Yellow INSULATORS • materials that dont allow electricity toBlue + Green + Red = White pass through them easily. Materials suchCMYK (CYAN, MAGENTA, YELLOW, KEY/BLACK) as rubber are good insulators and areCyan + Magenta= Blue used around appliance and house wires to keep the electricity from creating aCyan + Yellow = GreenYellow + Magenta = Red short circuit THE LAW OF CONSERVATION OF CHARGECyan + Magenta+ Yellow = Black • Charges cannot be created nor destroyed, but can betransferred fromHEAT WAVES one material to another.The total charge • a form of energy that refers to the in a system must remain constant. thermal energy that is ‘in transit’ or in ELECTROSTATIC LAW the process of being transferred. • Like charges repel and unlike charges • It stops to become heat when the attract. transfer stops. • After the energy is transferred, say to -mct another object, it may again become thermal energy or may be transformed to other forms. • Any object issaid to possess thermal energy due to the movement of its STUDY HARD!!! particles. How isheat related to thermal energy? GOOD LUCK!!! • Like any other forms of energy, thermalenergy can be transformed into

×