The University of Texas at Austin
McCombs School of Business
Foundations of Accounting (ACC 310F)
Assignment 2
Once you have completed the assignment below, you must submit your answers using the answer sheet provided in
Canvas (in the Assignments area);
21-Ch 10 Torque
If the torque on an object adds up to zero, the object could be both turning and accelerating linearly
Torque = R*F
*study this shit you dont get it*
I = integral R^2 dm
22-Ch 10 Rotational Dynamics
Rotational kinetic energy + 1/2Iw^2
Rota
10-Ch 5 and Ch 6 Complicated Motion
Nonuniform circular motion, the obejct still in a circle but the speed varies
Caused by the acceleration perpendicular to the radial direction
(called tangential acceleration)
Since both tangential and centripetal at ri
31-Ch 13 Fluids
Liquids and gases both flow, are called fluids
Density or p=m/v
Pressure = P = F/A
Pressure is the same in every direction at a given depth
Pressure = pgh
Pressure increases with depth
Absolute pressure is the sum of the atmospheric pressu
08-Ch 5 Friction
Static friction: the type that keeps stationary objects from moving even when there is a force applied
Points opposite the applied force
Kinetic friction: the type that makes heat when a moving object rubs against a surface
What is fricti
17-Ch 8 Conservation of Energy
Energy can be transformed from one form to another, but it is never added or destroyed
1/2mv1^2 + mgy1 = 1/2mv2^2 + mgy2 + F(friction)*length
W = GmM(earth)(1/r2)-(1/r1)0
Gravitational Potential Energy= U(rr) = =-GmM(earth)/
02-Ch 2 2D Motion
Displacement is how far it is from starting point (delta(x) = x2-x1)
Distance traveled is measured along actual path of object
Always zero or positive, never negative
Average speed= distance travelled/time elapsed
Average velocity = disp
06-Ch 4 Newtons Laws
Newton 1: Law of Inertia- every object continues in its state of rest, or of uniform velocity in a straight
line, as long as no net force acts on it.
Newton 2: The acceleration of an object is directly proportional to the net force ac
29-Ch 14 Harmonic Motion
F = -kx duh
Dispacement is measured from eqiuilibrium point
Amplitude is max displacement
Cycle is a full there and bacj motion
Period is the time taken to complete the cycle
Frequency Is the number of cycles completed per second
19-Ch 9 Collisions
Inelastic collosion:
momentum of the system is conserved, but the kinetic energy of the system is not conserved
Some of the initial KE is lost due to thermal or potential energy
Kinetic energy can be gained during explosions.
Completely
E. Craig Dukes
Physics 1425
General Physics 1
Linear Momentum
Definition of Linear Momentum
r
r
p mv
Note:
vector quantity
units: kg m/s
linear momentum
no special name!
We can rewrite Newtons Second Law in terms of momentum:
r
r
r
r mvr mvr
r
p
p
r
v
E. Craig Dukes
Physics 1425
General Physics 1
Dynamics: Newtons
Laws of Motion
Classical Mechanics
Today we start our discussion of dynamics, or
the causes of motion.
The first complete exposition of the causes of
motion was given in 1687 by Isaac Newton,
E. Craig Dukes
Physics 1425
General Physics 1
Conservation of Energy
Throwing an Object up in the Air
If I take a piece of chalk and throw it up in the air
what happens to its kinetic energy?
vf
mgh f
W K
Fd cos K K f K i
mg (h f hi ) 12 mv 2f 12 mvi2
cos
E. Craig Dukes
Physics 1425
General Physics 1
Gravitation and
Newtons Synthesis
Newtons Law of Universal Gravitation
It is Newton who discovered
the first fundamental force, gravity,
r
r
F1
F2
m1
r
m2
Lets say we have two objects m1 and m2 separated by a
E. Craig Dukes
Physics 1425
General Physics 1
Using Newtons Laws:
Friction, Circular Motion,
Drag Forces
Friction
In our discussion of motion and its causes we have ignored frictional
forces. In many cases, however, friction forces are vitally important.
E. Craig Dukes
Physics 1425
General Physics 1
Describing Motion:
Kinematics in One Dimension
Kinematics
Kinematics: How to describe motion.
Dynamics: The study of causes of motion.
: Greek word for motion.
Two types of kinematics:
1. Galilean (what we wil
E. Craig Dukes
Physics 1425
General Physics 1
Kinematics in Two or Three
Dimensions; Vectors
Scalars and Vectors
There are two types of physical quantities that physicists use to
specify things:
Scalars: A physical quantity that is completely specified by
E. Craig Dukes
Physics 1425
General Physics 1
Work and Energy
So What is Energy?
We see it comes in many different forms.
It is conserved. That is, it can be converted from one form to
another, with the total always remaining the same. This is very
impo
Energy is a conserved quantity
Question 4: why is it harder to lift a wagon up than lower a wagon down?
Answer: You do work on the wagon when you lift it. The wagon does work on you when you
lower it.
Energy:
A conserved quantity
It cant be created or
HOW THINGS WORK MIDTERM 1 STUDY GUIDE
WHAT THE HECK IS PHYSICS? (great thought)
Definition: the study of the basic physical world
SKATING
Question #1: A rotary lawn mower spins its blades and cuts the grass
tops. Would the blade still cut the grasses if
Question #6: Why does a skater need wheels to skate?
Answer #6: Real-world complications usually mask inertia.
Solution: minimize or overwhelm complications
To observe inertia, therefore:
Work on level ground (minimize gravity)
Use wheels, ice, or ai
Ramps
1/30
Question 4
Q: why is it harder to lift a wagon up than to lower a wagon down?
A: you do work on the wagon on the wagon when you lift it. The wagon does work on you when
you lower it.
Energy- a conserved quantity
It cant be created or destroye
Vector quantity
The amount and direction of the push or pull
Net force: the vector sum of all forces on an object (take into
account direction)
Pulling left and right with equal force, cancels out and = 0
Question #4: How does a skater start or stop
Question #9: How differently do different balls fall?
Answer #9: They all fall together!
A balls weight is proportionate to its mass
Weight of ball/mass of ball = 9.8 N/kg
Near earths surface, every kilogram of mass weighs 9.8 N
ACCELERATION DUE TO GRAVI
Question #3: How can we describe the motion of a coasting skater?
Answer #3: The skater moves at a constant speed in a constant
direction (constant velocity)
1. Position:
a. an objects location
b. distance and direction from a reference
2. Velocity:
a.