Fall 2010 PHYS116A-02
Midterm 3
Practice test 1
1. Two disks are mounted on low-friction bearings on a common shaft. The first disc has rotational inertia I and is spinning with angular velocity . The second disc has rotational inertia 2I and is spinning
Work and Kinetic Energy
Chapter 6 and 7
1
Energy and Work
Energy is a scalar quantity associated with the
state (or condition) of one or more objects.
It is a number, which if defined appropriately
is always conserved in physical processes.
Work is ene
Vector Properties
Components
Unit Vectors
Scalars and Vectors
2 types of quantities:
Scalar a magnitude or single number
Ex: time, temperature, mass, density,
numbers without units
Vector a magnitude and direction
Ex: velocity, acceleration, displacem
Kinematics
Displacement, Velocity, and
Acceleration
Mechanics
Mechanics the study of relationships among force
matter and motion
2 Parts to Mechanics
Kinematics - description of motion of objects w/o consideration
of the causes of the motion
Dynamics
Measurement
Chapter 1
1
Measurement in physics
Physics attempts to
describe and understand
nature in an objective way
through measurement.
Measurement is the only
way we can verify a
hypothesis or a model.
2
Units and Measurements
We measure physical q
Chapter 13: Gravity
Universal Gravity and the Principle of Equivalence
Mass (m) (kg) = A scalar property of every piece of matter that determines the
strength of its gravitational interaction with other pieces of matter. Except at very
high speeds, the ma
Center of Mass and Momentum
PHYS116A02,9/30/10, Lecture11 MomchilVelkovsky
Center of mass
y m4 m3 m2 m1 x
r r r m1r1 + m2 r2 + L mn rn r rcom = , in components: M m x + m2 x2 + L mn xn m y + m2 y2 + L mn yn m z + m2 z2 + L mn zn xcom = 1 1 , ycom = 1 1 ,
Work and Kinetic Energy
PHYS116A02,9/23/10,Lecture9 MomchilVelkovsky
Consider the vectors shown. What is the dot product C.D ?
0% 0% 0% 0% 0%
A.(120m2)cos78.0 B.(120m2)sin78.0 C.(120m2)cos62.0 D.(120m2)sin62.0 E.noneofthese
Consider the two vectors What
Torque, Rolling and Angular momentum
PHYS116A02,10/12/10, Lecture14 MomchilVelkovsky
The vector product
Torque
A force applied at a right angle to a lever will generate a torque. The distance from the pivot to the point of force application will be linear
Projectile Motion, Circular Motion, Relative Motion
PHYS116A02,9/7/10,Lecture4 MomchilVelkovsky
Acceleration
What is the direction of the rovers average acceleration vector for the time interval from t = 0.0 s to t = 2.0 s?
0% 0% 0% 0% 0%
A.upandtothele
w1 1=Mg wx w1 =Mg1 =Mg N y1 N N 45 45 T11 2 Tx T1 #1 y a1 ff#2 2 Answers ks #3 o a11 a 30 w2 =mg =0 #4 PHYS116A.01 Midterm Exam 1 Version P w1 w =mg (Version T2 w22 =mg 1 answers are a permutation of Version 2 answers) R w T22 y T a2=0 Q w a22 =o0 ax Towa