Transcript PHY 2053C – College Physics A Spring 2004

L21—Ch11Ch12
PHY 2053C – College Physics A
Spring 2004

Motion, Forces, Energy, Heat, Waves
Dr. David M. Lind
Dr. Kun Yang Dr. David Van Winkle
Today:
 SPOT evaluations: 10:10-10:20
 Recap Mini-exam#7
 Review for Final



Kinematics
Force & acceleration
Work & Energy –
-- conservation laws
 Rotational motion
 Momentum, Impulse
-- conservation laws (again)
 Fluids: bouyancy, lift
 Heat & Thermodynamics
The final exam will be held: Wednesday, December 8 at 10:00-12:00, in
275 Fisher Lecture Hall; and will be comprehensive.
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Topics covered
on the final
 Circular motion
– speed and acceleration
 Work, Energy, and Forces
 Moment of Inertia
 Inelastic and elastic collisions
 Momentum, Impulse
 Circular Motion*
– angular speed and linear speed,
– centripetal forces
 Momentum*
– inelastic collision & momentum transfer
– (force & momentum)
 Potential and Kinetic energy*
– conservation of energy and frictional forces
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Topics covered
on the final2

Force of Gravity

Equilibrium: conditions for…
 Ideal gas law
 Friction and Normal Forces*
– angular speed and linear speed,
– centripetal forces
 Momentum* – static & kinetic friction – acceleration
 Torques & Equilibrium*
– net torques, tension, pivot points
 Bouyancy – displacement of volume of liquid
 Waves and wave motion -- definitions
 Projectile motion*
– kinematical equations in 2-d
 Fluids* – statics (hydraulics)
 Heat and Thermodynamics*
– conservation of energy, calorimetry, specific heats
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Stay tuned...
Announcements (repeat)
 The final exam will be held: Wednesday, December
8 at 10:00-12:00, and is scheduled for 275 Fisher
Lecture Hall, not in our current classroom!!
 The final exam will be comprehensive,
Enjoy yourChristmas holiday!!
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Important Points from
last Lecture

Simple Harmonic Oscillator is a
consequence of
F
2
m
, f
k
1
T
1
2
k
m
T 2
l
, f
g
1
T
1
2
g
l

The Period T is T

Pendulum:

kx
Damped Oscillations:
Shock absorbers:
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Standing Waves:
Resonances on Strings
A wave on a string is always being reflected back
and forth on both ends with a negative sign, which
leads to standing waves -- “superposition of two waves moving in
opposite directions.”
0
,f
f0
,f
2f0
,f
3 1f 0
Nodes (“stationary points”) and
Antinodes (“maximum displacement points”)

Possible wavelengths, frequencies:
2l
n
0
n
f
v
n
2l
n f0
0
2
0
3
Resonances in a Tube



Most wind instruments use
resonances in a tube.
Closed end: displacement
node
Open end: displacement
antinode
1
L
4
3
L
4
5
L
4
1
3
5
=>
=>
=>
f1
f3
f5
v
L
4
v
3 L
4
v
5 L
4
even harmonics can
not have an antinode
at the open end
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