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Rank these cars based on momentum before they hit the brakes: Remember…. m v = p

Rank these cars based on momentum before they hit the brakes: Remember…. m v = p. Look at Car A… m = 1000 kg v = 20 m/s Solve for “p” u sing m v = p m v = ( 1000kg )( 20 m/s ) m v = 20,000 kg m s. 20,000 kg m s. 10,000 kg m

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Rank these cars based on momentum before they hit the brakes: Remember…. m v = p

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

  2. Rank these cars based on THE IMPULSE needed to stop them • Remember…. Ft = m Δv Look at Car A… m = 1000 kg Δv = v2 – v1 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 - 20,000 N.s -10,000 N.s -10,000 N.s -10,000 N.s -20,000 N.s -5,000 N.s A = E B = C = D F Most NEGATIVE Most POSITIVE

  3. Rank these cars based on THE FORCE needed to stop them • Remember…. Ft = m Δv 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! Not enough info to solve! Most NEGATIVE Most POSITIVE

  4. Take out your HW THAT WAS DUE TODAYPOGIL : Last page

  5. FOLLOW THROUGH in sports Pulling slingshot back all the way Bending knees when jumping Bungee jumping with elastic Running on asphalt Airbags! Moving hand back when catching Head 1st into brick wall Bungee jumping with rope Run on concrete Moving INTO a punch Karate chop Locked knees when jumping

  6. 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.

  7. Exit • Take out your textbook HW form the past 2 nights: • #1-6 • And #7-10 • We are popcorning – listen, ask questions, make corrections!

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