AP Physics Tuesday 13.09.03 Standards: Motion Objective: SWBAT use significant figures when problem solving. Warm Up A person runs a 15km race in 4 hours.

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AP Physics Tuesday 13.09.03 Standards: Motion Objective: SWBAT use significant figures when problem solving. 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. Agenda Warm Up Review HW Significant Figures Rules Significant Figures Practice 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. 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 Agenda Warm Up Correct Homework Distance,Displacement,Speed&Velocity Constant Velocity Car Lab

AP Physics Friday 13.09.06 Standards: 1a: Motion in one dimension Objective: SWBAT solve average speed, displacement & velocity problems. Warm Up What is the slope of your Tumblebuggy Lab graph equivalent to? (This question is not asking for numbers.) Agenda Warm Up Quiz 2 Distance&Displacement, Speed&Velocity Practice Problems Homework Page: #3 Average Velocity & Displacement Quiz 2

Significant Figures Rules: Digits from 1-9 are always significant Example: 129 has 3 sig. figs. Zeros between two other significant digits are always significant. Example: 5,007 has 4 sig. figs. Trailing zeros are significant only if the number has a decimal point. Example: 100.0 has 4 sig. figs., but 100 has 1 sig fig. Leading zeros are never significant. 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 correct answer in sig figs Find the number of sig figs Find the correct answer in sig figs 12.11+18.0+1.013 0.6875-0.1 5.19+1.9+0.842 1081-7.25 25.36-4.15 55.46-28.9 12.01+35.2+6 0.15+1.15+2.051 505-450.25 0.021+3.2+100.1 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 1.11x3.0 125x10 121x0.10 121x0.1 25.0/5.0 1.74561x1 127,500x2 2.222/2.00 9x8 66/33 5.413/0.10 4.75x103x1.0x10-2 2.0x104x0.00005 20,000x107x0.0000000015 4.0761x103x2.000000 Round to the correct # of sig figs. 1. 23+46=69 2. 23.0+46.0=69 3. 253+345.8=598.8 56-35 56.00-35.0 46x12=552 3.24x5.63=18.2412 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. What is motion? Design your lab and collect data. You need at least 10 data points. Don’t just wing it if you don’t know something. Ask questions. Research using your textbook or the internet. 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,Velocity distance vs. displacement -- walking speed vs. velocity -- running average velocity vs. instantaneous velocity – changing speeds vs constant speed.