Post on 23-Dec-2015
transcript
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!