Momentum and Impulse in Honors Physics Day
Dive into the realm of momentum and impulse in physics through examples, homework discussions, graph analysis, and a hands-on mini-lab activity. Explore concepts like isolated systems, impulse calculation, and interpreting physical scenarios to enhance your understanding of physics principles.
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Presentation Transcript
HONORS PHYSICS DAY Here we go! Today: 1) I remind you about momentum and impulse, I do one example, you do one example. 2) I ask about HW, and make it sound sincere 3) We try a graph and 2 AP problems together, and see that we can do it. 4) You do a mini lab activity (due next time) with momentum and impulse.
The CHANGE of MOMENTUM for a single thing is called the IMPULSE. IMPULSE: J It can be found through two ways: J
How can you tell this is an isolated system? Lets turn it into a non-isolated one
REMINDER OF IMPULSE AND MOMENTUM A 2kg softball is pitched to me and hits my bat at +20m/s, and I hit the ball so that it leaves my bat going 20m/s the opposite way.
REMINDER OF IMPULSE AND MOMENTUM A 2kg softball is pitched to me and hits my bat at +20m/s, and I hit the ball so that it leaves my bat going 20m/s the opposite way. Is the impulse of the ball zero or a numerical value? Table time Impulse is -80N*s!
REMINDER OF IMPULSE AND MOMENTUM A 2kg softball is pitched to me and hits my bat at +20m/s, and I hit the ball so that it leaves my bat going 20m/s the opposite way. If the bat hit the ball for .1 second, how much force was there? Math time 800N!
NOW YOUAT YOUR SEAT, WITH TABLES You (a 50kg physics student) run at 4m/s to jump on your friends back (who is 40kg, and decided to take AP Environmental Science like a loser) who is still. As you collide, you move off together at what speed? 2.2m/s
So Viis -2m/s Vfis 6m/s, and t is .4 sec Find impulse from P =Pf-Pi, so mvf mviwhich is also m(vf vi). Get (2)(6 (-2)) = 16N*S Impulse also =F*t. 16 = F(.4), so F = 40N B) Already answered, 16N*s
NOW TRY BOTH AP QUESTIONS, ON THE BOARDS. DO BOTH AND THEN WE CAN CHECK Try both, get an answer, not on paper yet. Check it after.
C Since identical, if one is moving at 2m/s and then they stick together, the total momentum is moving now 2 cars, so each car is going the original velocity.
D So the starting velocity could be 2.8 up to 3.2 m/s. Since like last time the velocities of the equal masses will be the result, we should see 1.4 to 1.6m/s.
NOW THE ACTIVITY Lets start. Lets read the goals Get the graphs, then lets talk (10 minutes?)
