March 04, Teacher. Demonstrations
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- Kristopher King
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1 Teacher Brainstorm momentum, collisions Demonstrations bowling ball and skate board (roller blades work best) or scooter Impulse change in momentum on the track with the elastic band (mini-lab) bungee jumping (stretchy string - from metal bar - change in momentum of a hanging mass thephilling.blogspot.com flicker.com video's see digital media downloads folder bungee jump - macau tower impulse / momentum baseball bat - timewarp video ffden-2.phys.uaf.edu hsphysicsteacher.com volleyball-store.com Before v i = 7.0 m/s to the right What will this ball do, if there is no friction or air resistance? After v f = 4m/s to the right What does the ball "have", because it is moving? Does this change? (from before to after) Explain What must have happened? explain directions (signs)
2 Reading/ Notes - Practice - Momentum and Impulse start here, or draw graph first What is the momentum of a 12 kg ball (initially ) rolling to the right at 7.0 m/s? Before a force acts on the ball v i = 7.0 m/s to the right If the ball has an impulse exerted on it and it is now moving at 4.0 m/s to the right, what is it's new momentum? What would a picture of this situation look like? (see pictures) After a force acts on the ball v f = 4m/s to the right What is the change in momentum of the ball? does sign matter? explain? What must have been the Impulse on the ball? What does the ball "have", because it is moving? What must have happened? explain directions (signs) Does this change? (from before to after) Explain If the object had a force act on it for 0.36 s, what magnitude and direction was the force? Momentum is- Momentum Impulse - Change in Momentum Equation impulse / momentum baseball bat - timewarp video Equation Units Deriving The Impulse Change in Momentum equation (note difference compared to book) Examples of objects with a lot of momentum (explain why?) (show units match as well) Examples of objects with a little momentum (explain why?) Zero momentum? Final equation Vector diagram of an object with momentum (car, tennis ball and racket) Simple momentum practice problems - as needed - practice A Force vs time graphs - concept Practice B
3 Practice B #3 mass = 82 kg Practice B #2 Hint: Use conservation of Energy First **get the velocity of the person the instant before they hit the water first: this becomes the initial velocity of the person upon impact with the water. h = 3 m horizontal bungee water bungee jumping- turn sound off mass = 82 kg Practice B #2 Hint: Use conservation of Energy First **get the velocity of the person the instant before they hit the water first: this becomes the initial velocity of the person upon impact with the water. Braking Distance (practice C "like") A 100 kg car is driving along at 35 m/s and skids to a stop. Find the following. v i + + v f Then use the impulse - change in momentum concept V i = m = 100 kg h = 3 m V f =? ( come to a stop in the water) v i = 35.0 m/s to the right braking distance F f = 500 N backwards (to the left) What is the the time to stop? Δt =? horizontal bungee What is the braking distance? Δx =? water bungee jumping- turn sound off
4 Force Vs Time Graph Find the impulse according to the graph between 10 and 20 seconds? Find the impulse between 25 and 30 seconds?
5 Find the impulse between 25 and 30 seconds? -400 N * 5 s = Ns Scenario ** the negative sign matters ; it is related to the direction of the impulse Comes from the graph, but be careful - it is connected to your time interval.
6 March 04, 2013 Actual impulse graphs are usually not perfect squares. Our lab will look more like this. What can you say about the force exerted? Find vf at 20 and 30 seconds? Two Cases to apply the Impulse Change in Momentum equation: What is the point of an airbag? Explain using momentum, impulse, force, time and conservation concepts. I. Maximum change in momentum: explain and show math II. Constant change in momentum, two different kinds of force: explain and show math egg throw
7 What can you say about the force applied on each of the objects in a collision? How is an astronaut able to move around in space? Human Rocket pforce/circus/ Practice Impulse Quiz #1 Use the following graph to find the Impulse and change in momentum of a ball that initially (t= 0s) is moving at 6m/s moving in the positive direction, with a mass of 4kg. Assume positive direction is to the right. What is the impulse on the ball for the first 2 seconds? What is the change in momentum? (between 0-2s) instantaneous speed at t=2s? (v at 2s) What is the impulse on the ball between 2 and 4 seconds? What is the change in momentum? (between 2s 4s) instantaneous speed at t=4s? What is the impulse on the ball between 4 s and 10 seconds? What is the change in momentum? (between 4 and 10) instantaneous speed at t=10s? What direction is it going?
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Clearly communicate your understanding of the physics principles that you are going to solve a question and how those principles apply to the problem at hand. You may communicate this understanding through