Chapter study guide

Why do cars have crumple zones and airbags? How does rocket propulsion work? How can you predict where two pool balls will go after they collide? These are problems that involve momentum, impulse, and the conservation of momentum. Momentum is a physical description of mass in motion; the higher the mass or velocity of an object, the more momentum it has. The conservation of momentum is a fundamental law of physics—akin to energy conservation—that is essential for understanding collisions, whether between two cars or between two subatomic particles.



By the end of this chapter you should be able to
describe momentum and impulse and solve problems using them;
apply impulse to real-world problems, including situations involving cushioning and impacts;
define momentum conservation and describe applications of it;
use momentum conservation to solve noncollision problems;
distinguish among elastic, inelastic, and perfectly inelastic collisions;
apply momentum conservation to solve collision problems; and
determine whether a collision is elastic using energy arguments.



Design project: Egg drop
11A: Conservation of momentum
11B: Collisions


308Momentum and impulse
309Momentum and inertia
310Impulse and Newton’s second law
311Impulse and momentum
312Design a crash barrier
313Impact forces and cushioning
314Section 1 review
315Conservation of momentum
31611A: Conservation of momentum
317Solving momentum conservation problems
318Rocket propulsion
319Section 2 review
320Collisions
321Inelastic collisions
32211B: Inelastic collisions
323Elastic collisions
32411C: Elastic collisions
325Collisions in two dimensions
326Section 3 review
327Chapter review
p =m v
J=Δp=FΔt
m 1 v i1 + m 2 v i2 = m 1 v f1 + m 2 v f2
1 2 m 1 v i1 2 + 1 2 m 2 v i2 2 = 1 2 m 1 v f1 2 + 1 2 m 2 v f2 2
 
momentumimpulselaw of conservation of momentum
collisioninelastic collisionelastic collision

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