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Momentum Image:

Vocabulary Sheets Due Sept. 24

Monday Sept. 8

Momentum p = mv p = momentum (kg·m/s) m = mass (kilograms, kg) v = velocity (meters/second, m/s) Momentum = “amount of motion” Example: A superhero of mass 75 kg is moving at 65 m/s. Find the momentum of our man in tights. Find the velocity at which a freight train of mass 200,000 kg has the same momentum.

Impulse I = FΔt I = impulse F = force (Newtons, N) Δt = change in time (seconds, s) Thanks Mr. Newton Impulse is change in momentum

As Seen in Action Comics #13 Superman stops a locomotive. A 200,000kg train is moving at 15 m/s. After Superman flies into it, the train is moving at 0 m/s. a)What impulse did Superman deliver to the train? b)If Superman and the train were in contact for 2 seconds, what average force did he exert? c)What was the average acceleration of the train during its contact with Superman?

Classwork Page 193 Problems 2-6

Tuesday Sept. 9

Energy Super Heroes Projects due September 24 You must work at home on these. There’s not enough class time. This week: 1. Super power 2. Name & origin story 3. List of concepts your hero can demonstrate.

Energy Super Heroes Presentations start on Sept. 24 Format: Slide show & speech Video Poster presentation Others? Image:

Rubric: Super Hero Project Week 2 ObjectiveValue Hero is original25 Super power relevant to our topic25 Hero has a name and identity25 List of concepts your hero can demonstrate (ie, what physics will you be showing?) 25

Superhero Energy Project Due Monday, September 15 by or hard copy in class. From kinetic energy, potential energy, and conservation of energy, write 1 problem at minimum. From thermal energy, thermodynamics, and specific heat, write 1 problem at minimum. From momentum, impulse, and conservation of momentum, write 1 problem at minimum. Looking forward and due on Friday, Sept. 19: From any of the above topics, write 2 additional problems.

Friday Sept. 12

How Fast v 2 = 2gh Velocity squared equals two times acceleration due to gravity times height Note: How fast doesn’t care how heavy.

Impulse I = FΔt I = impulse F = force (Newtons, N) Δt = change in time (seconds, s) Thanks Mr. Newton Impulse is change in momentum

Terminal Velocity The upper limit of how fast. How fast? Skydiver with a semi-closed parachute: 195 km/h (120 mph) World record human freefall speed is 988 km/h (614 mph) Source: It happens when your weight is exactly balanced by an upward force called drag. How long? About 15 seconds