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 = mDv Dt using algebra: FDt = mDv impulse momentum momentum p =mDv 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… impulse… 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 = F̅ 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. m1v1,i + m2v2,i = m1v1,f + m2v2,f total initial momentum = total final momentum Kinetic energy remains the same. No energy is lost. http://www.walter-fendt.de/ph11e/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. m1v1,i + m2v2,i = m1v1,f + m2v2,f http://www.walter-fendt.de/ph11e/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. m1v1,i + m2v2,i = (m1+ m2)vf http://www.walter-fendt.de/ph11e/collision.htm

Inelastic collision http://www.physicsclassroom.com/class/momentum/u4l2b.cfm

Elastic or inelastic?

Elastic or inelastic?

Elastic or inelastic? Find velocity of Second car M1=140kg M2= 180 kg V1i= 20m/s V2i=30m/s Find vf

m1v1,i + m2v2,i = m1v1,f + m2v2,f find out if energy is conserved when m1=5 kg m2= 5kg V1i=10m/s V2i=20m/s V1f=15m/s V2f= 15m/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=JAUoeqvedMo https://www.youtube.com/watch?v=VDfsUO_KPkE https://www.youtube.com/watch?v=eisKxhjBnZ0 https://www.youtube.com/watch?v=seMwpP0yeu4 https://www.youtube.com/watch?v=Skpu5HaVkOc

https://www.youtube.com/watch?v=vn9mMeWcgoM https://www.youtube.com/watch?v=2QKg5SZ_35I https://www.youtube.com/watch?v=MFWF9dU5Zc0 https://www.youtube.com/watch?v=7Pa_Weidt08

https://www.youtube.com/watch?v=ZQIQCBvyQuM https://www.youtube.com/watch?v=6ZfuNTqbHE8 https://www.youtube.com/watch?v=d5exSS74Lh0

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. v1= 3 m/s v2= 4 m/s. find the momentum after collision if my velocity with the sand is 6 m/s. 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 m1v1,i + m2v2,i = (m1+ m2)vf Fn Fg

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!