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
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
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 magnitu
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
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
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 oth
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
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.(12
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
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
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