Askey Physics

All things Physicsy

12/3-12/7 (Free Fall, Inertia)

Posted on December 8, 2018 by daskey

I will add captions as I have time this weekend . . .

: PhyFl18–SS3.2.1 Packet 3 Tree stamps with class!

: PhyFl18–SS3.2.2 the perfect gift

: PhyFl18–SS3.2.3 Monday 12/3/18

: PhyFl18–SS3.4 Prob 3.5.1c

: PhyFl18–SS3.2.5 Problem 3.5.1e

: PhyFl18–SS3.2.6 We were SO close to the actual number. The best in 30 years! 30 years I tell you! Are these the glory days of NHS Physics?

: PhyFl18–SS3.2.7 Orange to Blue.

: PhyFl18–SS3.2.8 Prob 3.5.2

: PhyFl18–SS3.2.9 the triop graph of 3.5.2

: PhyFl18–SS3.10 Tuesday 12/4/18

: PhyFl18–SS3.2.11 Basketball (550g) vs. tennis ball (55 grams) Despite 10X the mass, the basketball falls at the same acceleration as the tennis ball.

: PhyFl18–SS3.2.12 So why do they fall at the same rate?

: PhyFl18–SS3.2.13 THe answer is: Inertia vs. force. Inertia is NOT force. It is a property of matter as Bill Nye says, but it is so much more. I’ve always thought that was a stupid thing to repeat over and over. Yes it is a property of matter, big deal. It is a measure of the RESISTANCE to change in velocity that na object has. The more the resistance the more the mass.

: PhyFl18–SS3.2.14 Mass is the measure of the resistance

: PhyFl18–SS3.2.15 So then why does the Big ball fall at the same increasing speed as the small ball so that they hit the ground at the exact same time with the exact same speed? The answer is that the Big ball has 10X the resistance to fall than the small ball. Gravity puts 10X the force on it to get it to fall. The tennis ball has 10X LESS force pulling on it, but it only offers 1/10 of the resistance. It’s a perfect balance between force of the Earth’s gravitational pull and the relative resistance each object offers.

: PhyFl18–SS3.2.16 10X the force, 10X the resistance

: PhyFl18–SS3.2.17 . . .

: PhyFl18–SS3.2.18 One of the hours discussed the effect of air drag. We will look at this more second semester. This is me trying to give a quick and dirty explanation of air drag. Will not be on the next test.

: PhyFl18–SS3.2.19 The offical Newton’s 1st Law of Inertia. We are trying to get this down to 4 words so we can put it on a t-shirt.

: PhyFl18–SS3.2.20 Wednesday 12/5/18

: PhyFl18–SS3.2.21 Prob 3.5.3

: PhyFl18–SS3.2.22Prob 3.5.6

: PhyFl18–SS3.2.23 Prob 3.5.6

: PhyFl18–SS3.2.24 Prob 3.5.6b

: PhyFl18–SS3.2.25 Prob 3.5.6 birth of the first green

: PhyFl18–SS3.2.26 Prob 3.5.6 The easy version of the 2nd Green Launch Equation

: PhyFl18–SS3.2.27. How the velocity vector changes as an object falls.

: PhyFl18–SS3.2.28 Thursday 12/6/18

: PhyFl18–SS3.2.30 1st Green Launch Equation

: PhyFl18–SS3.2.31 2nd Green Launch Equation

: PhyFl18–SS3.2.32 Negative Free Fall Trios

: PhyFl18–SS3.2..33 We talked about the St. Louis Arch because I thought at one time that it was a negative parabola. Turns out it is much more complicated.

: PhyFl18–SS3.2.34 Friday 12/7/18

: PhyFl18–SS3.2.35 Determining our slow reaction time.

: PhyFl18–SS3.2.36 . . .

: PhyFl18–SS3.2.37 . . .

: PhyFl18–SS3.2.38 . . .

: PhyFl18–SS3.2.39 Equations we used to determine our reaction time to 3 siggies.

: PhyFl18–SS3.2.40 . . . .

: PhyFl18–SS3.2.41 2nd hour rxn times.

: PhyFl18–SS3.2.42 3rd hour rxn times

: PhyFl18–SS3.2.43 6th hour rxn times

: PhyFl18–SS3.2.44 7th hour rxn times

: PhyFl18–SS3.2.45 Being honest with your measurements

: PPhyFl18–SS3.2.46 Rocket launch for next week

: PhyFl18–SS3.2.47 Astronomy night next week

: PhyFl18–SS3.2.48 Biggest Stamp payoff of the year next week.

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