DAY I ON ISN TITLE momentum and impulse

DAY I • ON ISN • TITLE: momentum and impulse

Momentum momentum - property of all moving objects; a vector quantity defined as an object's mass times its velocity from: F = ma F = m. Dv Dt using algebra: FDt = m. Dv impulse momentum p =m. Dv units: kg*m/s =m(Vf - Vi)

• This equation states that a net external force, F, applied to an object for a • certain time interval, Δt, will cause a change in the object’s momentum equal • to the product of the force and the time interval.

Example problem

Summary momentum… – is a quantity that describes an object's resistance to stopping (a kind of "moving inertia"). – is represented by the symbol p (boldface). – is the product of an object's mass and velocity. p = m v • impulse… – is a quantity that describes the effect of a net force acting on an object (a kind of "moving force"). – is represented by the symbol J (boldface). – is the product of the average net force acting on an object and its duration. J = F Δt

Practice in your ISN: use Guess for full credit

Bell ringer day 2; separate sheet of paper • Summarize momentum and impulse by answering the following • Define it: • What do the letters in the formulas represent: • Formula: • Compare and contrast both :

DAY 2 • On ISN • Title : conservation of momentum

Conservation of Momentum Law of conservation of momentum - total momentum of all objects interacting with one another remains constant. Initial momentum is equal to final momentum. m 1 v 1, i + m 2 v 2, i = m 1 v 1, f + m 2 v 2, f total initial momentum = total final momentum Kinetic energy remains the same. No energy is lost. http: //www. walter-fendt. de/ph 11 e/collision. htm

Conservation of Momentum elastic collisions - a collision between two objects where the objects "bounce off" or remain separate from each other after the collision. m 1 v 1, i + m 2 v 2, i = m 1 v 1, f + m 2 v 2, f http: //www. walter-fendt. de/ph 11 e/collision. htm

Conservation of Momentum inelastic collisions - a collision between two objects where the objects remain "stuck" or connected together after the collision. Kinetic energy is lost to other forms of energy. m 1 v 1, i + m 2 v 2, i = (m 1+ m 2)vf http: //www. walter-fendt. de/ph 11 e/collision. htm

Inelastic collision • http: //www. physicsclassroom. com/class/m omentum/u 4 l 2 b. cfm

Elastic or inelastic?

Elastic or inelastic?

Elastic or inelastic? • • Find velocity of Second car M 1=140 kg M 2= 180 kg V 1 i= 20 m/s V 2 i=30 m/s Find vf

m 1 v 1, i + m 2 v 2, i = m 1 v 1, f + m 2 v 2, f • • find out if energy is conserved when m 1=5 kg m 2= 5 kg V 1 i=10 m/s V 2 i=20 m/s V 1 f=15 m/s V 2 f= 15 m/s If so why if not why ?

Separate sheet of paper 12 videos • Write two scenarios ; one for elastic and one for inelastic collisions in complete sentences for each video

• https: //www. youtube. com/watch? v=JAUoeqved. Mo • https: //www. youtube. com/watch? v=VDfs. UO_KPk. E • https: //www. youtube. com/watch? v=eis. Kxhj. Bn. Z 0 • https: //www. youtube. com/watch? v=se. Mwp. P 0 yeu 4 • https: //www. youtube. com/watch? v=Skpu 5 Ha. Vk. Oc

• https: //www. youtube. com/watch? v=vn 9 m Me. Wcgo. M • https: //www. youtube. com/watch? v=2 QKg 5 SZ_35 I • https: //www. youtube. com/watch? v=MFWF 9 d. U 5 Zc 0 • https: //www. youtube. com/watch? v=7 Pa_ Weidt 08

• https: //www. youtube. com/watch? v=ZQIQC Bvy. Qu. M • https: //www. youtube. com/watch? v=6 Zfu. N Tqb. HE 8 • https: //www. youtube. com/watch? v=d 5 ex. S S 74 Lh 0

DAY 3

example • While walking on the beach the sand got stuck to my foot. Find the conservation of momentum if the mass of the sand is. 30 g, mass of foot is 70 g. v 1= 3 m/s v 2= 4 m/s. find the momentum after collision if my velocity with the sand is 6 m/s. Fn Fg » » then solve using GUESS method ; define which problem is inelastic and which is elastic here the sand stuck to the foot so it is inelastic so I will use this formula m 1 v 1, i + m 2 v 2, i = (m 1+ m 2)vf »

Now you give me two problems for inelastic and two for elastic. • Include a word problem and diagram as well as the solutions. Individual work. Be creative! EXTRA POINTS FOR EXTRA IMAGINATION!