IPS Objective Understand collisions and momentum Calculate momentum

IPS Objective: • Understand collisions and momentum. • Calculate momentum and explain the relationship between momentum, mass, and velocity. Warm Up: Joe applies a horizontal force of 5 N to a 20 kg block to move at a constant speed to the right. Draw a Free body diagram to represent the object. Determine the normal force acting on the block. Then calculate µ. Thursday, October 23,

Momentum = Mass in motion Any object that is moving has momentum

IPS Objective: • Understand collisions and momentum. • Calculate momentum and explain the relationship between momentum, mass, and velocity. P=MV Warm Up: Erin has a mass of 65 kg, she is running with a velocity of 4 m/s. What is her momentum? Michaella is running at a speed of 5 m/s and has mass of 52 kg. What is her momentum? Who has a greater momentum? Friday, October 24, 2014

Demo- PASCO Car collision Each group will create 3 collisions, observe and record your observations. Then write a real life scenario for each collision. If your car goes off the track, pick it up, pick it up. Redo the collision. 1. Red car + 250 g into Blue car + 250 g 2. Red car + 250 g into Blue car no added mass 3. Red car no added mass into Blue car + 250 g Create a real life scenario for each of the collisions and be creative. Individually, write a paragraph for each collision. (Paragraphs are a minimum of 7 sentences)

What are the units for momentum? p = m x v Momentum = mass x velocity kg∙m/s = kg x m/s

What are the units for momentum? Units = kg∙m/s Measurement Unit Distance Meters (m) Time Seconds (s) Velocity m/s Acceleration m/s 2 Force Newton (N) Momentum kg∙m/s

Teacher Demo- PASCO Cars Two head-on collisions, same speed moving at each other. Record your observations, create a real life collision for each PASCO collision. 1. Red car + 250 g into Blue car + 250 g 2. Red car + 250 g into Blue car no added mass Two explosion collisions, record your observations 1. Red car + 500 g into Blue car + 500 g 2. Red car into Blue + 500 g

Demo vs fast Which is harder to stop? slow

What is the equation for momentum? Momentum depends on the mass of the object and the velocity at which its traveling Momentum is DIRECTLY proportional to mass and velocity. (if mass , momentum , if velocity , momentum ) Momentum = mass x velocity p = m x v

Think, Pair, Share WHICH HAS MORE MOMENTUM? OR

What if I tell you…. Mass of the bullet = 0. 045 kg Velocity of bullet = 3000 m/s Mass of elephant= 1250 kg Velocity of elephant= 0. 108 m/s

And the winner is…. p = mv pbullet = (. 045 kg)(3000 m/s) = 135 kg∙m/s pelephant = (1250 kg)(. 108 m/s) = 135 kg∙m/s EQUAL!!

What it might look like on a test:

Work it Out Determine the momentum of … 60 -kg halfback moving at 9 m/s 1000 -kg car moving at 20 m/s. 40 -kg freshman moving at 2 m/s. A bicycle has a momentum of 24 kg • m/s. What momentum would the bicycle have if it had … twice the mass and was moving at the same speed? the same mass and was moving with twice the speed? one-half the mass and was moving with twice the speed? three times the mass and was moving with one-half the speed? three times the mass and was moving with twice the speed?

Exit Ticket What two things does momentum depend on? What letter represents momentum? If mass and velocity double, what will happen to an object’s momentum?