Physics 2A Midterm Examination
Solutions - Section 001
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Note that Section 020 had the same questions, just in a different order.
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Course evaluation
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between now and Friday, Jun 3
Final exams:
Section 1: 6/8 3 - 6 PM
Section 20: 6/6 7 - 10 PM
Lecture 26
Collisions
Energy and Work
May 27, 2016
Goals for Today
2
Equilibrium
Consider a particle with t
Lecture14
Circular Motion
April 27, 2016
Goals for Today
2
Something must supply the force necessary to keep the object
moving in a circle!
n
Side view
T
Top view
w
!
The tension in the string supplies the force
toward the center that keeps the ball
movin
Lecture 11
rd
3
Newtons
Law
Equilibrium
Dynamics
April 20, 2016
Goals for Today
2
normal force and weight are NOT pairs!
Interacting Objects - Newtons
rd
3
Law
Force of hammer on nail
accelerates nail into the wall
Force of nail on hammer
accelerates the
Lecture 20
Stability
Springs and Hookes Law
Elasticity
May 13, 2016
Goals for Today
2
Balance
For an object to balance, its center of gravity must be over the
base of support. That way gravity does not exert a torque.
Line of action
Gravity acts at the c
Lecture 17
Torque
May 6, 2016
Goals for Today
2
Opening a Door
The four forces shown have the same magnitude. Which
would be the most effective in opening the door?
A. Force F1
B. Force F2
C. Force F3
D. Force F4
E. Either F1 or F3
perpendicular and furth
Physics 2A
Spring 2016
MWF 12:10-1:00 (Sec 001)
MWF 3:10-4:00 (Sec 020)
Prof. Robert Clare
Lecture 1
March 28, 2016
What is Physics?
Physics is a way of looking at the physical aspects of
nature.
Physics is more about relationships than about facts.
Fa
Physics 2A Final Examination
Name _
Signature _
Student ID Number_
By signing this exam, you affirm that you are the person named on this exam with this
student ID. You also agree to abide with the Academic Integrity Policy, as outlined in
the course intr
Lecture 10
nd
2
Newtons
Law
Free Body Diagrams
rd
Newtons 3 Law
April 18, 2016
Goals for today
X
2
Force, acceleration and mass
inverse to mass!
Same force here!
3
Newtons Second Law
4
Force Unit
!
!
F = ma
2
[M][L/T ]
2
kgm/s
In SI units:
N for Newton
2
Lecture 9
Forces
April 15, 2016
Goals for today
also spring
2
Dynamics
Up to now we have dealt with kinematics
- The how an object moves
Now we start looking at dynamics
- The why an object moves
We have to explore a new concept: force
3
Seat Belts - A
Lecture 22
Conservation of Momentum
May 18, 2016
Goals for Today
2
A 150g baseball is thrown with a speed of 20m/s. It is hit straight back to the pitcher with
a speed of 40m/s. The interaction between the bat and the ball has the shape shown.
What is the
Lecture 12
Some more Dynamics
Friction
Drag
April 22, 2016
1
Goals for Today
2
Discussion Question
A Martian lander is approaching the surface. It is slowing its descent by
firing its rocket motor. Which is the correct free-body diagram for the
lander?
A
Lecture 8
Finish Projectile Motion
Circular Motion
Apr 13, 2016
Finish
Goals for today
2
Solving Projectile Motion Problems
3
4
A ball is hit and then caught at the same height that it was hit.
If it is hit at a 30 angle, with what speed must it leave the
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Lecture 25
Conservation of Energy
Potential Energy:
Gravitational and Elastic
May 25, 2016
Goals for Today
less
2
Potential Energy
Rank in order, from largest to smallest
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Lecture 28
Conservation of Energy
June 3, 2016
Final exams:
Section 1: 6/8 3 - 6 PM
Section 20: 6/6 7 - 10 PM
Goals for Today
2
Finding force from potential energy
W(ss+s) = Fs s
U = W(
Lecture 5
Constant Acceleration
Free Fall
April 6, 2016
Goals for Today
2
Acceleration - 3
These 4 motion diagrams show the motion of a particle along
the x axis. Which motion diagrams correspond to positive
acceleration?
positive is always to the RIGHT
1
Lecture 23
Angular Momentum
May 20, 2016
Goals for Today
2
Sliding Boxes
The 1 kg box is sliding across a frictionless surface. It collides
with and sticks to the 2 kg box. Afterward, the speed of the
p=0
two boxes is
A. 0 m/s.
p=3
B. 1 m/s.
C. 2 m/s.
D.
Physics 2A Final Examination
You have 3 hours to answer 39 multiple-choice questions on the exam. There are 26
conceptual questions worth 1 point each and 13 quantitative questions worth 2 points each.
This is a closed-book exam, no books or notes are all
Physics 2A Final Examination
Name _
Signature _
Student ID number _
Section 1, MWF 9:10AM10:00AM.
Section 20, MWF 11:10AM12:00PM.
You have 3 hours to work 4 problems and answer 25 multiple-choice questions on the exam.
Make sure you have a complete test w
Physics 2A Midterm Examination
You have 80 minutes to answer 21 multiple-choice questions on the exam. There are 14
conceptual questions worth 1 point each and 7 quantitative questions worth 2 points each.
This is a closed-book exam, no books or notes are
Lecture 6
Vectors & Scalars
Apr 8, 2016
Goals for today
2
Scalars and Vectors
The temperature of a room at any point
has just a value.
Temperature is a scalar.
To describe the motion of people in the
rooms, we need both a magnitude (speed)
as well as a di
Lecture 18
Rotational Dynamics
May 9, 2016
Goals for Today
2
Newtons Second Law for Rotation
I = moment of inertia. Objects
with larger moments of inertia
are harder to get rotating.
I = mi ri
2
a = tnet /I
(Compare to a = Fnet/m)
3
Two Dumbbells
Which du
Lecture 13
Interacting Objects
April 25, 2016
MIDTERM EXAM: Monday, May 2, here
Bring a redF289-PAR-L scantron
Bring a #2 pencil and your student ID
Calculators OK; but no programs on programmable ones!
All equations that you will need will be supplied on
Lecture 3
Constant Velocity
(Constant Acceleration)
April 1, 2016
Goals for Today
2
Hockey Puck
The graph of velocity versus time for a
hockey puck shot into a goal appears like this:
Which of the following position graphs matches the velocity
graph?
A.
B
Lecture 15
Gravity
April 29, 2016
Goals for Today
2
static
Here it is friction that supplies the force!
Static because the car is not moving sideways! (r is constant)
Loop-the-loop!
A roller coaster car does a loop-the-loop.
Which of the free-body diagram
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between now and Friday, Jun 3
Lecture 27
Work by Variable Forces
Work and Potential Energy
Final exams:
Section 1 (12-1PM): 6/8 3 - 6 PM
Section 20 ( 3-4PM): 6/6 7 - 10 PM
June 1, 2016
Goal for Today
2