Physics General Terms volume The volume of this test tube is quite large. mass A liter of gas has less mass than a liter of water. density Zx The density of molecules increases with pressure. formula Ԛڨ There is a formula to calculate distance. velocity x The velocity of light is faster than that of sound. acceleration x This car has good acceleration. force The force of gravity makes things fall to earth. gravity d Gravity caused the object to fall. friction C Friction caused the object to slow down. pressure The air in tires is under pressure. equilibrium s The forces reached a state of equilibrium. energy GlѰM[ Heat is often released when energy is used. temperature x The water's temperature is over 90o solid ԁ When liquids are cooled they often become solid. liquid t When solids are heated they often become liquid. gas C Oxygen and nitrogen are gases. Particles q charge d The battery was fully charged. atom ԫq Atoms combine with other substances to form molecules. proton zq A proton has a positive charge. electron dq Electrons have a negative charge. neutron q A neutron has no electrical charge. nucleus ԫqj A nucleus consists of protons and neutrons. Elements f bond ٽ Bonds hold chemical elements together isotope Isotopes are often unstable. ion CI Ions have an electrical charge. molecule q Molecules are groups of atoms. fusion ԫqjٽ Fusion is the action that joins atoms together. fission j Fission is the action that splits atoms apart. Electronics G԰NgٰjNX conductor Wood is a poor conductor of heat. insulator ƉŶ Rubber is a good insulator of electricity. battery dr The battery is flat so the car won't start. current d Current flows when the switch is turned on. voltage d Don't touch this wire; the voltage is high.. resistance R Copper has less resistance than lead. circuit ŖH A break in the circuit caused the light to go out. electricity dC People depend on electricity very much. magnet ڴC Magnets attract other metals. generator dC Generators are used to generate electricity. transformer ɒ A transformer is used to change electrical force. Light and Waves dCg ray ԛƟ A ray is a narrow beam of light. reflect ᭎ The sun was reflected in the mirror refract џƆ᭎ The light was refracted by the water. laser Ԫ[U Lasers now have many applications. mirror Ѳ Most large telescopes use mirrors. concave The shape of the mirror was concave. convex The glass was a convex shape. spectrum XyNg Red and violet are at opposite ends of the spectrum. frequency U The radio signal has a very high frequency. wavelength g The radio signal had a very short wavelength. x-ray XƟ X-rays can pass through various substances. gamma ray K}Ɵ Gamma rays have short wavelengths. radiation Radiation escaped from the nuclear plant. vibration U Vibration caused the machine to break. echo We could hear the echo several seconds later. Verbs bend 魡 Light bends when it passes through water. store Эϭ Energy was stored in the battery. lose The battery slowly lost energy as it was used. melt nݭ᭎ Ice melts above 0C. freeze ѭ᭎ Water freezes below 0 C. boil ǭ᭎ Water boils at 100 C. burn R᭎ Dry wood burners quicker than wet wood. heat g The solution was heated to 90 C cool p᭎ The liquid was cooled to just above freezing. measure v Measure the volume before you heat it. increase ᭎ Don't increase the temperature too quickly. decrease Э᭎ The pressure decreased rapidly. expand c⣭᭎ The ice expanded as it froze. contract [k'ntrak] ڞk᭎ The metal contracted in the cold temperature. corrode H᭎ Iron corrodes easily. release ᭎ Heat was released along with the energy. store ~᭎ Energy was stored inside. Adjectives `e positive ҭ All numbers greater than zero are positive. negative ŭ All numbers less than zero are negative. magnetic ڴǭʭ The metal had a magnetic force. permanent iv The reaction caused a permanent change. temporary ÐI The change was only temporary. gradual X The decay was very gradual. abrupt } The compound abruptly became unstable. kinetic ^ǭ Kinetic energy was released. elastic eʭ The material used was quite elastic. ultraviolet ڽO Humans cannot see ultraviolet rays. infrared O Infrared rays have long wavelengths.