1. Week

2.  Student will: Impulse and Momentum  Study Impulse and Momentum in one dimension

3. Momentum: Momentum: “inertia in motion” -A vector Questions 1)How would you describe momentum?

4. Impulse: Impulse: A force exerted over a time interval that causes a change in an object’s momentum. -Is a vector J = FΔt = mΔv Kg ∙ m/sNs Impulse (Kg ∙ m/s) = Force (N) x Time(s) kgm/s = mass (kg) x change in velocity (m/s) Questions 1)How does an airbag work?

5. Example: Impulse Assume a bullet travels with a mass of 15 grams at 400 m/s and hits the Hulk. The bullet’s velocity drops to 0 m/s. Calculate the force’s magnitude required to stop the bullet in.5 seconds.

6. Given: m = 15 g = 0.015 kg v i = 400 m/s v f = 0 m/s t = 0.5 s Unknown: F = ? Steps 1)Define Assume a bullet travels to the right with a mass of 15 grams at 400 m/s and hits the Hulk. Calculate the force’s magnitude required to stop the bullet in.5 seconds. Magnitude only

7. Choose an equation or situation: Rearrange the equation to isolate the unknown: 2)Plan What is the unit of the left hand side?

8. Substitute the values into the equation and solve 3)Calculate Negative number tells you the direction

9. The Hulk would exert a force of 12 N on the bullet to stop it in.5 seconds. Question: If the Hulk stops the bullet in 0.01 seconds instead, what is the Force then? 4)Evaluate Extension