» Discuss with a partner: What does it mean to conserve something? ˃To save ˃To only use a portion of ˃To make it last ˃To store » Discuss with a partner:

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Presentation transcript:

» Discuss with a partner: What does it mean to conserve something? ˃To save ˃To only use a portion of ˃To make it last ˃To store » Discuss with a partner: what is conservation of momentum? ˃The momentum of a system remains the same if there are no external forces ˃We can illustrate this concept using collisions between objects +The momentum of the objects before the collision is equal to the momentum of the objects after the collision MV total = Mv total MV + MV = MV + MV

» Elastic collisions occur when two or more objects collide without any being deformed or creating heat ˃The objects bounce off of each other and transfer their momentum BeforeCollisionafter 2 m/s 0 m/s 2 m/s 1 m/s 2 m/s

» Inelastic collisions occur when colliding objects become tangled, coupled or combined » Ex: 4 m/s 0 m/s 1000 kg V = ?? MV + MV = MV 1000 kg (4m/s) kg (0 m/s) = 2000 kg (V) 4000 kg m/s + 0 = 2000 kg (V) 4000 kg m/s = 2000 kg (V) 2000 kg 2 m/s = V

» (Mythbusters) ˃Think how you could use the conservation of momentum formula to prove why and how the cars look they way they do after the crash.

75 kg 2 m/s 15 kg 2 m/s V = ?? MV + MV = MV 75 kg (2m/s) + 15 kg (2 m/s) = 90 kg (V) 150 kg m/s + 30 kg m/s = 90 kg (V) 180 kg m/s = 90 kg (V) 90kg 2 m/s = V

» A 2 kg goldfish is swimming towards the right at 5 m/s when a 15 kg puffer fish swims up and eats it. The pufferfish was swimming towards the left at 7 m/s. What is the final velocity of the two fish after the puffer fish eats the goldfish? MV + MV = MV 2 kg (5m/s) + 15 kg (7 m/s) = 17 kg (V) 10 kg m/s kg m/s = 17 kg (V) 115 kg m/s = 17 kg (V) 17 kg 6.76 m/s = V

» A.3 kg marble rolls to the right at 20 m/s and hits has a head-on collision with a.6 kg marble moving 15 m/s to the left. After the collision, the first marble moves to the left at 15 m/s. What is the second marbles final velocity? MV + MV = MV + MV.3 kg (20m/s) +.6 kg (15 m/s) =.3 kg (15 m/s) +.6 kg (v) 6 kg m/s + 9 kg m/s = 4.5 kg m/s +.6 kg (v) ) 15 kg m/s = 4.5 kg m/s +.6 kg (v).6 kg 17.5 m/s = V 15 kg m/s = 4.5 kg m/s +.6 kg (v) kg m/s kg m/s 10.5 kg m/s =.6 kg (v)

» A quick review video on conversation of momentumconversation of momentum