Physics Physics TopicsTopics 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

•The density of water is 1 gram per cubic centimeter

• 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

HOW DOES HEAT FLOW?

Find examples of heat flow

Specific Heat Capacity

• 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

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

How do I calculate velocity?

• Velocity = Distance /Time• Or the TAKS TEST could expect you to use

•GPE lost equals KE gained

• So mgh(lost)=0.5mv2 (gained)

• The m cancels so therefore

• Velocity= √2gh

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…

Time

Dis

tan

ce

If you have a….

☼ 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 VS TimeVelo

city

Time

FIRST LAW OF MOTION

•INERTIA LAW

•SEAT BELT LAW

FIRST LAW OF MOTION

•INERTIA LAW

•SEAT BELT LAW

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

SECOND LAW

•F(net)= M*A

THIRD LAW

• EVERY ACTION FORCE IS ACCOMPANIED BY AN EQUAL AND OPPOSITE

REACTION FORCE

MOMENTUM

• IN ANY

COLLISIONALWAYS

• CONSERVED

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

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 THEOREMThis is called the WORK –ENERGY THEOREM

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

power

• 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

1joule/1second

1 Watt=1 kilowatt=1,000 watts

WAVES

• Carry Energy

• Do Work

• Therefore exert a force and move objects a distance

• Transverse

• Longitudinal

Velocity of all waves in the Electromagnetic Spectrum

• RRMIVUXG

All Electromagnetic Waves in a vacuum Travel at the same speed and that is

3 x 108 meters per second

Electromagnetic wavesCan travel through aMedium or a vacuum.

Particles vibrate PARALLEL to the

energy.

Compression-area of high pressure-( like crest)

Rarefaction area low pressure (like trough)

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