Guess Method

1
Guess Method
2

• Pick up sheets on back Table
• Get out conversion Homework
• Check
• Correct
• GUESS Method Notes
• GUESS Sample Problems
• GUESS Homework Due Friday
• Astronomy Binder Due AYE Monday

3
What is it?

• A systematic way to approach and solve physics
  word problems

Why do we use it?

• to see what we have what we need to find, to
  identify people who are stuck so help can be
  given- partial credit is your friend

4
What do the letters stand for?

• Given
• the given information in the problem
• The stated necessary facts (learn to ignore
  unnecessary facts)
• Unknown
• Unknownwhat is being asked for, look for key
  words
• Equation
• Plan/method of attackthe relationship between
  the given and the unknowns
• A mathematical formula, NO numbers
• Written in words or symbols

5
What do the letters stand for?

• Solve
• This is where you plug the numbers into the
  equation and do t he work
• NO naked numbers
• Show all work and calculations
• Solution
• Check your solution ( put it back into the
  problem)
• The final answer must have units, rounded to
  nearest 100th and be circled.

6
How will physics problems be done in order to
receive credit?

• In pencil
• By GUESS method
• Partial credit can be your friend
• 7pts per problem
• NO WORK NO CREDIT

7
Sample Problems

• Paul Safetee is in the lab mixing the chemicals
  for his latest experiment. After careful
  calculation he concludes that he needs 25 grams
  of sodium and 25 grams of chlorine. What would be
  the total mass of chemicals?
• G Na 25g, Cl 25g
• U Total Mass ?
• E Na Cl Total Mass
• S 25g 25g 50g
• S Total Mass 50g

8

• Lisa Lovescake is having a party and she hates
  leftovers. She baked her famous RED cake in a
  square pan. The size of the pan allows for 12
  pieces of cake. If Lisa has 7 guests how many
  pieces of cake will each get? (no
  fractionsdecimals rounded to the nearest
  hundredths place)
• G Lisas pan makes 12 pieces of cake, Lisa has 7
  guests. (Did not specify that Lisa ate cake)
• U how many pieces of cake each guest gets?
• E pieces of cake pieces of cake per guest
• of Guests
• S 12 pieces of cake 1.7142857
• 7 guests
• S each guest will get 1.71 pieces of cake

9
Homework 1

• G
• check 25.00
• Polly Pocket 8.72
• ½ of check to Bank
• U
• how muck of birthday check goes into piggy bank
  ?
• E check pp leftover for piggy bank
• 2
• S 25 12.50 - 8.72 3.87
• 2
• S 3.78 left for piggy bank

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Homework 2

• G
• Practice at 630am
• Time up 550am
• 18 min to get ready
• 9 min to get to school
• U
• What time will he get to school?
• How many minutes will he have to spare?

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Homework 2

• E
• Time up time to get ready Time to get to
  school arrival time
• Practice time arrival time minutes to spare
• S
• 550 am 18 min 608 am
• 608 am 9 min 617 am arrival time at
  school
• 630 am 617 am 13 minutes to spare
• S 617 am arrival time at school
• 13 minutes to spare

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Homework 3

• G
• L 27.50
• S 13.89
• D 11.73
• C 24.95
• U
• Total cost of luncheon?
• E
• L S D C total cost

13
Homework 3

• S
• 27.50 13.89 11.73 24.95 78.07
• S
• Total cost of Luncheon 78.07

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Homework 4

• G
• m 34.5g, v 12.8ml
• 1ml 1cc , v 12.8cc
• U
• Density in g/cc ?
• E
• d m/v
• S
• d 34.5g/12.8cc 2.6953125 g/cc
• S density 2.70 g/cc