Top View

1
Top View
A puck slides on a frictionless table and
collides with a block, initially at rest. In
(1) the puck bounces off with the same speed
,
In which situation does the block end up with
the largest momentum?
(2),
2
Physics 2211 Lecture 24
Momentum in Two Dimensions Angular Momentum
3
Fireworks Explosions
Fragments tend to fly of in all directions.
4
Momentum Conservation is a vector relation
Conservation applies to each component separately
we will limit ourselves to 2D
5
(No Transcript)
6
ONE particle moving to the right explodes. Which
of the following diagrams could represent the
initial VELOCITY vectors of the three fragments?
(a)
(b)
(c)
(d)
1. all 2. none 3. all but (a) 4. (c) (d)
5. all but (c) 6. (c) (d)
7
Inelastic Collision in 2D
this vector is conserved!
8
Inelastic Collision in 2D (Example 9.9)
9
Top View
A puck slides on a frictionless table and
collides with a block, initially at rest. In
(1) and (2), the puck bounces off with the same
speed
In which situation does the block end up with
the largest speed?
10
Collision Between and X-ray and an atomic
Electron
Analyzed using 2D Conservation of Momentum by
Arthur Compton in 1923. This proved that light
(x-ray) sometimes behaves like a particle
(photon).
11
Momentum of a System is Conserved (constant) when
External Forces are Zero
F is internal. It is cancelled by equal
and opposite force of boy on man. Momentum of boy
man is conserved.
F is external. Momentum of boy is not Conserved
12
For circular (more generally, rotational) motion
13
Angular Momentum
14
(No Transcript)
15
1. stays the same
3. decreases
2. increases
4. cant tell
16
Beginning at rest, what is the direction and
magnitude of the velocity vector for the heavy
(H) man just after the light (L) man jumps?
17
Cats Experts on Angular Momentum
18
Recap
Momentum in Two Dimensions Angular Momentum
Next Lecture
Knight Sections 10.1 10.2 Kinetic Energy
--
Potential Energy