Homework Due Read , Do # 7-10 pg. 100 & Finish POGIL Tonight’s HW Tonight’s HW Read & STUDY , Do # pg. 100 & Finish POGIL from today’s class (up to p.4) QUEST Jan 17 th & 21 st, or 22 nd & 23 rd (date TBD) **Since it is an OPEN NOTES QUEST, no study guide or formulas provided. However, study as if it were CLOSED NOTE!!! Do Now 1.Put BOTH of your HW assignments TOGETHER in the In Box (stack them together – don’t need to staple) 2.Take one from my desk and complete! You have 5 minutes; you may collaborate with your peers.

Rank these cars based on momentum before they hit the brakes: Remember…. m v = p 20,000 kg m s 10,000 kg m s s s 20,000 kg m s 5,000 kg m s F B = C = D A = E Most NEGATIVE Most POSITIVE Look at Car A… m = 1000 kg v = 20 m/s Solve for “p” using mv = p mv = (1000kg)(20 m/s) mv = 20,000 kg m s

Rank these cars based on THE IMPULSE needed to stop them Remember…. Ft = m Δv - 20,000 N. s-10,000 N. s -20,000 N. s-5,000 N. s A = E B = C = D F Most NEGATIVE Most POSITIVE Look at Car A… m = 1000 kg Δv = v 2 – v 1 Δv = 0 – 20 m/s Δv = - 20 m/s mΔv = (1000kg)(-20 m/s) mΔv = -20,000 kg m s In other words… -20,000 N. s

Rank these cars based on THE FORCE needed to stop them Remember…. Ft = m Δv Not enough info to solve! Most NEGATIVE Most POSITIVE Look at Car A… mΔv = Ft -20,000 kg m = Ft s Slight problem…. We don’t know the stopping time! Without ‘t’ we can’t solve for F!

TAKE OUT YOUR HW THAT WAS DUE TODAY POGIL : LAST PAGE

WHAT?HOW?LIST SOME EXAMPLES? CASE 1 Increase Momentum (usually means velocity increases) Apply the greatest force for the longest time CASE 2 Decrease Momentum (usually means velocity decreases) Minimize forces by increasing stopping time Maximize forces while decreasing stopping time FOLLOW THROUGH in sports Bending knees when jumping Bungee jumping with elastic Running on asphalt Airbags! Head 1 st into brick wall Bungee jumping with rope Run on concrete Pulling slingshot back all the way Moving hand back when catching Moving INTO a punch Karate chop Locked knees when jumping

POGIL Do not use your book… READ the boxes on the POGIL. Recall prior info, use your HW, and USE THE BOXES!!! Check in at stop signs. You may ONLY USE the computer or a personal device (iPod, phone, etc.) when the instructions call for it; you may only use the listed site – NOTHING ELSE! Otherwise, computer and group privileges will be revoked for today, and personal devices confiscated. Goal is to FINISH THIS TODAY! Whatever is not finished becomes HW Stopping w/10 minutes left for an exit During this time, individual groups will be conferencing w/ a teacher to review your Newton's Laws Tests.

EXIT Take out your textbook HW form the past 2 nights: #1-6 And #7-10 We are popcorning – listen, ask questions, make corrections! HW HW Read & STUDY , Do # pg. 100 & Finish POGIL from today’s class (up to p.4) QUEST Jan 17 th & 21 st, or 22 nd & 23 rd (date TBD) **Since it is an OPEN NOTES QUEST, no study guide or formulas provided. However, study as if it were CLOSED NOTE!!!