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- CAPA Assignment #12 due this Friday at 10 pm
- Section: Lab #5, Springs and Things (note no prelab)
- Nagle’s office hours 2-3 pm cancelled
- Exam #3 on Tuesday, November 8th at 7:30 pm
- Today is a review of some exam topics….

- Tomorrow evening at 7:30 PM:
- Bring a #2 pencil, an eraser, and a calculator.
- No outside materials
- No cell phones or smart phones as calculator
- Same room assignments as previous exams

Reminder of Materials Available

- Textbook and example problems in the text
- Professor Dubson’s Chapter Notes (see link on web page)
- Clicker questions as posted in lecture notes
- CAPA problems, solutions on CULearn
- Practice exam and solutions on CULearn
- Lab manuals and problems

Room Frequency BA

A projectile is fired straight up and then comes back down to the ground. There is a force of air resistance.

During the entire flight, the total work done by the force of gravity is:

Zero

Positive

Negative

During the entire flight, the total work done by the force of air resistance is:

Zero

Positive

Negative

Room Frequency BA

A pendulum is launched in two different ways. During both launches, the bob is given an initial speed 3 m/s and the same initial angle from vertical.

Which launch will cause the pendulum to swing the largest angle from the equilibrium position to the left side?

Launch 1

Launch 2

Both are the same.

Room Frequency BA

A block of mass m with initial speed v slides up a frictionless ramp of height h inclined at angle q as shown. Assume no friction.

Whether the block makes it to the top depend on the angle q. What do you think about this statement?

A) True B) False

Room Frequency BA

A block of mass m slides down a rough ramp of height h. Its initial speed is zero. Its final speed at the bottom of the ramp is v.

m

h

Which is the amount of thermal energy, Ethermal, released from the block’s motion down the ramp?

Room Frequency BA

A pendulum consists of a mass m at the end of a string of length L. When the string is vertical, the mass has speed v0.

What is the maximum height h to which the mass swings?

Room Frequency BA

Ball 1 of mass m moving right with speed v bounces off ball 2 with mass M (M > m) and then moves left with speed 2v.

What is the magnitude of the impulse of Ball #1

A) mv B) 2mv C) 3mv D) ½ mv E) 0

Room Frequency BA

A bullet of mass m traveling with initial speed v hits a block of mass M on a frictionless table. The bullet buries itself in the block, and the two together have a final velocity vf.

The total kinetic energy of the bullet+block after the collisions is _______ the total KE before the collision.

Greater than

Less than

Equal to

Room Frequency BA

What is the torque about the origin?

r F sinq

r F cosq

zero

origin

Room Frequency BA

Two light (massless) rods, labeled A and B, each are connected to the ceiling by a frictionless pivot as shown. Both rods are released from a horizontal position.

Which one experiences the larger torque?

A) A B) B C) Same

θ

θ

Fg = mg

Room Frequency BA

Two light (massless) rods, labeled A and B, each are connected to the ceiling by a frictionless pivot as shown. Both rods are released from a horizontal position.

Which one has the larger moment of inertia?

A) A B) B C) Same

Room Frequency BA

A small wheel and a large wheel are connected by a belt. The small wheel turns at a constant angular velocity ωS.

There is a bug S on the rim of the small wheel and a bug L on the rim of the big wheel? How do their speeds compare?

vS = vL

vS > vL

vS < vL

Clicker Question

A rock of mass m is twirled on a

string in a horizontal plane.

The work done by the tension in the string on the rock is

Positive

B) Negative

C) Zero

T

The work done by the tension force is zero, because the force of the tension in the string is perpendicular to the direction of the displacement: W = F cos 90°= 0

Room Frequency BA

Roller Coaster Problem

N

Fnet,y = N-mg = may = mv2/r

v

mg

Approximately circular arc

If the car moving rightward at the top of this hill:

The net force on the car is upward.

The net force on the car is downward

The net force on the car is zero

Room Frequency BA

Two paths lead to the top of a big hill.

Path #1 is steep and direct and Path #2 is twice as long but less steep.

Both are rough paths and you push a box up each.

How much more potential energy is gained if you take the longer path?

A) none B) twice as much

C) four times as much D) half as much

2d

d

h

h

#1

#2

φ

θ

Room Frequency BA

A big ball of mass M = 10m and speed v strikes a small ball of mass m at rest.

After the collision, could the big ball come to a complete stop and the small ball take off with speed 10 v?

A) Yes this can occur

B) No, because it violates conservation of momentum

C) No, because it violates conservation of energy

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