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Physics TAKS Review

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Let’s get started with… Differences between convection, conduction, and radiation

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Convection, Conduction and Radiation 1. Convection -the transfer of heat by warmed matter. -occurs between liquids and gases. -heat moves in fluid motion Examples: steam from a coffee cup, warmth from a fire, and warm air rising

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Convection, Conduction and Radiation 2. Conduction - the transfer of energy from particle to particle - occurs between solids Examples: spoon in hot cup of soup becoming warmer, touching the stove and metal feeling cold

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Convection, Conduction, and Radiation 3. Radiation -Electromagnetic waves transporting energy through space. -Sunlight transfers waves Examples: feeling warmth from the sun and light from a light bulb

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Let’s practice… Try questions 1-9 on your review packet

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Now let’s talk about energy…

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Energy Renewable Energy can be replenished in short amount of time Hydropower- Energy produced by moving water Wind energy- produced by moving air Solar Power- solar radiation that reaches earth Biomass- stored energy in organic matter

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Energy Renewable Energy Advantages - produce few pollutants Disadvantages - variable amounts of energy - need continuous input (sunlight, wind, running water)

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Energy Nonrenewable Energy Can not be replenished in short amount of time Coal- found in mines, basic source of energy for US Natural Gas- under pressure a gas produced Oil- formed from remains of plants and animal underground Nuclear- splitting atoms produces heat

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Energy Nonrenewable Energy Advantages - energy can be used around the clock Disadvantages - produces pollutants - take millions of years to reproduce

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Let’s practice… Try questions 10-20 on your review packet

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Now let’s talk about waves…

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Waves Waves are the means by which energy is transferred from one point to another There are two types of waves: transverse and longitudinal Ex. Rope Ex. Slinky

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Waves Parts of a Wave the height of the wave Distance between two points Frequency- the number wave that pass a point in a second

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Waves The Wave Equations

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Waves Reflection: bounce off a surface Refraction: bend through an object Diffraction: waves wrapping around an edge Wave Movement

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Waves Resonance: vibrations caused by waves Polarization: filters block out certain wavelengths and allow only certain waves through Wave Movement

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Let’s practice… Try questions 21-31 on your review packet

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Now let’s talk about the formula chart…

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Formula Chart Every Equation You Need Can Be Found Here…

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Example Step 1: Find the important words…what are you looking for? Step 2: Find the equation on the formula chart

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Example %E = WoWo WiWi x 100 80 320 %E = 25 %

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Example Step 1: Find the important words…what are you looking for? Step 2: Find the equation on the formula chart

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Example V=V= d t 5 20 d= 100 m

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Example Step 1: Find the important words…what are you looking for? Step 2: Find the equation on the formula chart.

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mv 2 2 KE = Example 50 1 V=10 m/s

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Example Step 1: Find the important words…what are you looking for? Step 2: Find the equation on the formula chart

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Example P= W t 4.75 TIME OUT!!! We don’t have Work! W= F x d 12054 x 1.89 22782 P= 4796

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Let’s practice… Try questions 32-41 in your review packet

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Circuits Circuits have different components : Power Source Wire Switch Bulb

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Circuits When the power is turned on the current flows from the positive to negative end of the battery.

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Circuits Series Circuits are the simplest form of circuits. If the path is broken, no current will flow. –example: Christmas tree lights Series Circuit

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Circuits Parallel circuits have more than one way for current to flow. If the path is broken, current will still flow. Parallel Circuit

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Circuits I = Current V= VoltageR= Resistance (amps)(volts)(ohms) Ohm’s Law I= VRVR

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Circuits I= VRVR 3 1.5

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Let’s practice… Try questions 42-49 in your review packet

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THE END

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