Tuesday, March 23Tuesday, March 23rdrd

AgendaAgendaFinish lab calculationsFinish lab calculations

Chapter 8 Jeopardy ReviewChapter 8 Jeopardy Review

Homework: Homework:

Finish Chapter 8 Study GuideFinish Chapter 8 Study Guide

Chapter 8 crossword PuzzleChapter 8 crossword Puzzle

Chapter 8 Test/Study Guide DueChapter 8 Test/Study Guide Due

Thursday, March 24Thursday, March 24thth!!

Lab CalculationsLab Calculations

1.1. To convert grams to kilograms:To convert grams to kilograms:

a.a. Divide your number of grams by 1,000Divide your number of grams by 1,000

2.2. To convert centimeters to meters:To convert centimeters to meters:

a. Divide your number of centimeters by a. Divide your number of centimeters by 100100

Lab CalculationsLab Calculations

3. To find the average time ball traveled (s):3. To find the average time ball traveled (s):

a.a. Time ball traveled for trial #1Time ball traveled for trial #1

Time ball traveled for trial #2Time ball traveled for trial #2

++ Time ball traveled for trial #3Time ball traveled for trial #3

AnswerAnswer

b. Divide Answer by 3 to get average time (s)b. Divide Answer by 3 to get average time (s)

Lab CalculationsLab Calculations

Lab CalculationsLab Calculations5.5. To calculate final kinetic energy (J):To calculate final kinetic energy (J):

a. Use the equation for kinetic energya. Use the equation for kinetic energy

KE = ½ KE = ½ XX (mass of ball) (mass of ball) XX (final speed) (final speed)22

6.6. To calculate initial potential energy (J):To calculate initial potential energy (J):

a. Use the equation for potential energya. Use the equation for potential energy

PE = (mass of ball) PE = (mass of ball) XX (9.8 m/s (9.8 m/s22) ) XX (ht of ramp) (ht of ramp)

Defending Your ConclusionsDefending Your Conclusions

Use COMPLETE SENTENCES to answer Use COMPLETE SENTENCES to answer the “Defending Your Conclusions” section the “Defending Your Conclusions” section of the lab.of the lab.

Be sure to answer ALL PARTS of the Be sure to answer ALL PARTS of the questions, not just a Yes or No…questions, not just a Yes or No…

Jeopardy Teams1B

Team #1:Team #1:

Team #2:Team #2:

Team #3:Team #3:

Team #4:Team #4:

Team #5:Team #5:

Chapter 8Chapter 8Work & EnergyWork & Energy

THE RULES:

There will be 5 teams

The host’s decisions are final

Each member of the winning team will receive $1 mole money

And now…here is the host of Jeopardy…

Mrs. Elfline

Let’s Get Ready to play…

Today’s Categories are:

DefinitionsDefinitions

Simple MachinesSimple Machines

Critical ThinkingCritical Thinking

CalculationsCalculations

Word PuzzlesWord Puzzles

$100

$200

$300

$400

$500

DefinitionsDefinitions

$100

$200

$300

$400

$500

SimpleSimpleMachinesMachines

$100

$200

$300

$400

$500

CriticalCriticalThinkingThinking

$100

$200

$300

$400

$500

CalculationsCalculations

$100

$200

$300

$400

$500

Word Word PuzzlesPuzzles

FJFJ

A quantity defined as force X A quantity defined as force X distance distance

Answer…Answer…

WorkWork

100100

Power is calculated by dividing Power is calculated by dividing work by work by

Answer…Answer…

TimeTime

200200

The ability to do work definesThe ability to do work defines

Answer…Answer…

EnergyEnergy

300300

The sum of the kinetic and The sum of the kinetic and potential energy of large-scale potential energy of large-scale objects in a system is calledobjects in a system is called

Answer…Answer…

Mechanical EnergyMechanical Energy

400400

The ratio of useful work output to The ratio of useful work output to work input is a measure of work input is a measure of

Answer…Answer…

EfficiencyEfficiency

500500

Answer…Answer…

What are the 2 families of What are the 2 families of simple machines?simple machines?

100100

Lever and Inclined PlaneLever and Inclined Plane

Answer…Answer…

Levers are divided into how many Levers are divided into how many classes based on the location of classes based on the location of

the fulcrum?the fulcrum?

33

200200

Where is the fulcrum in a 1Where is the fulcrum in a 1stst class class lever?lever?

Answer…Answer…

In the middle of the rigid arm.In the middle of the rigid arm.

300300

What is the mechanical advantage What is the mechanical advantage of a single, fixed pulley?of a single, fixed pulley?

Answer…Answer…

11

400400

What class of lever is a bicep What class of lever is a bicep muscle?muscle?

Answer…Answer…

33rdrd class class

500500

A boy pushes on a parked car with A boy pushes on a parked car with a force of 200 N but the car does a force of 200 N but the car does not move. How much work does not move. How much work does

the boy do on the car?the boy do on the car?

Answer…Answer…

00(No work is done unless the object (No work is done unless the object

moves)moves)

100100

A quantity that measures how much a A quantity that measures how much a machine multiplies force or distance is machine multiplies force or distance is

calledcalled

Answer…Answer…

Mechanical AdvantageMechanical Advantage

200200

What is the ability to do work What is the ability to do work called?called?

Answer…Answer…

EnergyEnergy

300300

Gravitational potential energy Gravitational potential energy depends on the:depends on the:

a. Mass of the objecta. Mass of the objectb. Height of the objectb. Height of the object

c. Acceleration due to gravityc. Acceleration due to gravityd. All of the aboved. All of the above

Answer…Answer…

d. All of the aboved. All of the above

400400

What is the primary source of What is the primary source of the sun’s energy?the sun’s energy?

Answer…Answer…

Nuclear FusionNuclear Fusion

500500

A boy uses a force of 65 N when A boy uses a force of 65 N when he lifts a box 1.2 meters. How he lifts a box 1.2 meters. How

much work does he do?much work does he do?

Answer…Answer…

78 J78 J

100100

How much power is needed to do How much power is needed to do 180 J of work in 2.4 seconds?180 J of work in 2.4 seconds?

Answer…Answer…

75 watts75 watts

200200

What is the gravitational potential What is the gravitational potential energy of a 55 kg box that is 8.0 energy of a 55 kg box that is 8.0

meters above the ground?meters above the ground?

Answer…Answer…

4,312 J4,312 J

300300

A ball has a mass of 5 kg and is A ball has a mass of 5 kg and is thrown with a speed of 2 m/s. thrown with a speed of 2 m/s.

What is the kinetic energy?What is the kinetic energy?

Answer…Answer…

10 J10 J

400400

What is the efficiency of a ramp What is the efficiency of a ramp with a work input of 240 J and a with a work input of 240 J and a

useful work output of 180 J?useful work output of 180 J?

Answer…Answer…

75 %75 %

500500

Answer…Answer…

I’ll Get Over ItI’ll Get Over It

100100

Answer…Answer…

Square DanceSquare Dance

200200

““

Answer…Answer…

Scrambled EggsScrambled Eggs

300300

““

Answer…Answer…

What’s Up With That?What’s Up With That?

400400

““

Answer…Answer…

Some Are Over Worked and Some Are Over Worked and Under PaidUnder Paid

500500

Daily DoubleDaily DoubleHow much do you want

to wager?

Daily DoubleDaily Double

FINALFINALJEOPARDYJEOPARDY

CATEGORY:CATEGORY:

Word PuzzlesWord Puzzles

How much do you want to wager?

Proceed…Proceed…

Proceed…Proceed…

A Step A Step BackwardsBackwards

Proceed…Proceed…

Thanks for Thanks for PLAYING!PLAYING!