AP Physics
Tuesday 13.09.03
Standards: Motion
Objective: SWBAT use significant
figures when problem solving.
Agenda
1. Warm Up
2. Review HW
3. Significant Figures Rules
4. Significant Figures Practice
Warm Up
A person runs a 15km race in
4 hours. How fast is the
person going in m/s? Don’t
forget to convert km->m and
hr->s.
Homework
Significant Figures
worksheet
AP Physics
Wednesday 13.09.04
Standards: 1a Motion in 1
dimension
Objective: SWBAT discover the
essential components of motion
by designing their own inquiry.
Agenda
1. Warm Up
2. Correct Homework
3. Distance,Displacement,Speed&Veloc
ity
4. Constant Velocity Car Lab
Warm Up
A car moving at a speed of
22.5 m/s travels for 25s,
how far did it travel? Use
sig figs.
Homework
• Study for Quiz Friday
• Lab Write up Due Monday
AP Physics
Friday 13.09.06
Standards: 1a: Motion in one
dimension
Objective: SWBAT solve
average speed, displacement &
velocity problems.
Agenda
1. Warm Up
2. Quiz 2
3. Distance&Displacement,
Speed&Velocity
4. Practice Problems
Warm Up
What is the slope of your
Tumblebuggy Lab graph
equivalent to? (This
question is not asking for
numbers.)
Homework
Page: #3 Average
Velocity &
Displacement
Quiz 2
Significant Figures
Rules:
1. Digits from 1-9 are always significant
1.
Example: 129 has 3 sig. figs.
2. Zeros between two other significant digits are always
significant.
1.
Example: 5,007 has 4 sig. figs.
3. Trailing zeros are significant only if the number has a
decimal point.
1.
Example: 100.0 has 4 sig. figs., but 100 has 1 sig fig.
4. Leading zeros are never significant.
1.
0.0025 has 2 significant figures.
Practice: a.0.04, b.221.0, c.107 d. 127,000
Multiplying & Dividing Significant Figures
Rules: When multiplying or dividing, your answer may only
show as many significant digits as the multiplied or divided
measurement showing the least number of significant digits.
Ex. 22.37cm x 3.10cm x 85.75 cm = 5946.50525cm3
But where should we round? We can have only 3 sig. figs.
because that is our constraint. 3.10 cm has the least # of sig.
figs. and it has 3.
Practice: a.1.00/3, b. 12.0/4.000, c. 101*1.000000, d. 12/1.2
Adding & Subtracting Significant Figures
Rules: When adding or subtracting, your answer can only show
as many decimal places as the measurement having the fewest
number of decimal places.
Example: 3.76g+14.83g+2.1g=20.69g
When you add the numbers vertically you automatically line up
the decimal places. The one with the least number of decimal
places is your constraint. That is 2.1g. So your answer will have
1 decimal place. 20.7g
practice: 1.11+2.2+3.33, 4.00+2.0-5,
Practice with Sig Figs
Find the number of sig figs Find the correct
answer in sig figs
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
13)
14)
15)
0.02
0.020
501
501.0
5,000
5000.
6,051.00
0.0005
0.1020
10,001
1.0x103
2.06x106
0.0006x104
1.206x10-3
150x10-9
Find the correct
answer in sig figs
1. 12.11+18.0+1.013
2. 0.6875-0.1
3. 5.19+1.9+0.842
4. 1081-7.25
5. 25.36-4.15
6. 55.46-28.9
7. 12.01+35.2+6
8. 0.15+1.15+2.051
9. 505-450.25
10. 0.021+3.2+100.1
1. 1.11x3.0
2. 125x10
3. 121x0.10
4. 121x0.1
5. 25.0/5.0
6. 1.74561x1
7. 127,500x2
8. 2.222/2.00
9. 9x8
Round to the correct # of sig figs.
10. 66/33
11. 5.413/0.10
1. 23+46=69
12. 4.75x103x1.0x10-2
2. 23.0+46.0=69
4
13. 2.0x10 x0.00005
3. 253+345.8=598.8
14. 20,000x107x0.0000000015 4. 56-35
15. 4.0761x103x2.000000
5. 56.00-35.0
6. 46x12=552
7. 3.24x5.63=18.2412
8. 0.024x0.063
Motion of the Tumblebuggy.
This lab requires you to answer the following question using
the scientific method. A lab report will be required of each
individual: Due Monday Sept. 10th. You may work in pairs.
1. What is motion?
2. Design your lab and collect data. You need at least 10 data
points.
3. Don’t just wing it if you don’t know something.
4.
5.
1.
2.
Ask questions.
Research using your textbook or the internet.
3.
Email or tweet me over the weekend if necessary.
If everyone gets the lab in on time, I will allow rewrites, but just
for this lab. This is a 1 time offer. If one person is late, nobody
gets a rewrite.
Today is your only day to do the lab. If you don’t finish, you will
not have time on Friday during class. You’ll need to come before
school, after school, or during lunch.
Distance,Displacement,Speed,V
elocity
distance vs. displacement -- walking
speed vs. velocity -- running
average velocity vs. instantaneous velocity – changing speeds vs
constant speed.