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Physics Topics

Physics Topics. TAKS10-11. DENSITY. Density equals mass divided by volume First find the mass of the object with a scale (usually in grams when calculating density) Second find the volume ….either by using fluid displacement or measuring and multiplying

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Physics Topics

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  1. Physics Topics TAKS10-11

  2. DENSITY • Density equals mass divided by volume • First find the mass of the object with a scale (usually in grams when calculating density) • Second find the volume….either by using fluid displacement or measuring and multiplying • The density of water is 1 gram per cubic centimeter

  3. HOW DOES HEAT FLOW? • Through a solid by conduction • Through a fluid –either a liquid or a gas – by convection currents • Through a vacuum –by radiation-or electromagnetic waves

  4. Find examples of heat flow

  5. Aluminum 900 Copper 387 Lead 128 Mercury 139 Water 4,186 All in joules per kilogram degree celsius Tells you how much heat you have to add to 1 gram of a substance to change its temperature by 1 degree Celsius Specific Heat Capacity

  6. What do these numbers mean? • It is very easy to change the temperature of a kilogram of lead and it takes a LOT more HEAT to change the temperature of 1 kilogram of water • In general Water takes a lot of heat added to heat up and must also lose a lot of heat to cool off

  7. How do I calculate velocity? • Velocity = Distance /Time • Or the TAKS TEST could expect you to use • GPE lost equals KEgained • So mgh(lost)=0.5mv2 (gained) • The m cancels so therefore • Velocity= √2gh

  8. If you have a…. • An object traveling at constant speed • A constant slope • A bowling ball rolling down the hall • One object traveling faster than another object • An object with a positive velocity • Then you have… Distance Time

  9. If you have a…. Velocity VS Time • An object that is accelerating.. • An object whose velocity is directly proportional to the time… • A V vs T graph whose slope is steeper and so has a higher rate of acceleration… • Then you will have….. Velocity Time

  10. FIRST LAW OF MOTION • INERTIA LAW • SEAT BELT LAW

  11. FIRST LAW OF MOTION • INERTIA LAW • SEAT BELT LAW

  12. First Law of Motion • An object at rest will tend to stay at rest • An object in motion will tend to stay in motion at constant speed in a straight line until acted on by an outside UNBALANCED force

  13. SECOND LAW • F(net)= M*A

  14. THIRD LAW • EVERY ACTION FORCE IS ACCOMPANIED BY AN EQUAL AND OPPOSITEREACTION FORCE

  15. MOMENTUM • IN ANY COLLISIONALWAYS • CONSERVED

  16. WEIGHT • Weight = MASS times 9.8m/s2 • Weight is a measure of the force of gravity acting on an object • Weight is measured in Newtons • 1N=1kg*m/s2

  17. Work = force x distance When you do work on an object You increase its energy-----& When an object has energy it Can do work This is called the WORK –ENERGY THEOREM

  18. Energy is defined as…. • Anything that has the ability to do work • That means anything that has the ability to apply a force and move something a distance. Name some

  19. 1 kilowatt=1,000 watts power 1 Watt= 1joule/1second • Power is the rate at which work is done • Power equals the work per unit time • Or…. • The energy per unit time • Power is measured in Joules per second or…. • Whats….Watts

  20. WAVES • Carry Energy • Do Work • Therefore exert a force and move objects a distance • Transverse • Longitudinal

  21. Velocity of all waves in the Electromagnetic Spectrum • RRMIVUXG Electromagnetic waves Can travel through a Medium or a vacuum. All Electromagnetic Waves in a vacuum Travel at the same speed and that is 3 x 108 meters per second

  22. Longitudinal WAVES Compression-area of high pressure-( like crest) Rarefaction area low pressure (like trough) Particles vibrate PARALLEL to the energy.

  23. What is physics???? • THE MAJOR THEME IN PHYSICS IS ENERGY • YOU NEVER GET MORE ENERGY OUT OF A SYSTEM THAN YOU PUT IN • YOU CAN TRADE ONE QUANTITY FOR ANOTHER MANY TIMES BUT YOU WILL NEVER GET MORE OUT THAN YOU PUT IN ULTIMATELY

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