130 likes | 231 Views
Learn about momentum, collisions, and impulse, exploring the concepts and equations that govern interactions between objects in motion. Understand the conservation of momentum and how impulse affects momentum changes in dynamic scenarios.
E N D
Momentum Recap • Momentum: The product of the mass and velocity of an object • “How hard it is to stop something” • Equation: p = mv • Units: p = kgm/s m = kg v = m/s • Vector: When describing the momentum of an object, the direction matters.
Would you rather Would you rather? 1 m/s 100 m/s http://www.youtube.com/watch?v=JK81Ej5hm8s http://www.youtube.com/watch?v=iMq0Wyl-3ho
Would you rather? 10 m/s 10 m/s
Would you rather? 100 m/s 5 m/s
Momentum Recap • Collision: When 2 objects interact and “exchange” momentum • 2 Moving (Bounce off) • 1 Moving (bounce off) • 1 moving (stick together) • “Explosion
Momentum Recap • Conservation of Momentum: The sum of the total momentum BEFORE a collision, is the same as the sum of the total momentum AFTER a collision Momentum Before = Momentum After pi = pf p1i +p2i + p3i = p1f+p2f + p3f
Momentum Recap • Conservation of Momentum: The sum of the total momentum BEFORE a collision, is the same as the sum of the total momentum AFTER a collision
Real Deal • Step 1: Separate BEFORE and AFTER • Step 2: Make a table (p,m,v) for each object • Step 3: Eqtn to sum up total momentum BEFORE • Step 4: Eqtn to sum up total momentum AFTER • Step 5: Set the equations equal to each other.
Impulse • IMPULSE: A change in momentum Fnett = p = mv Units = Ns
Impulse Super Challenge: I = Ft