Physics 101
Homework 3
Due January 21
1. A stone is dropped from the top of a cliff. It hits the ground below after 3.25 s. How high is
the cliff?
Solution:
Choose upward to be the positive direction, and take y = 0 at the bottom of the cliff. The initial
Physics 101
Homework 2
Due January 19
1. Can an object have a varying speed if its velocity is constant? If yes, give examples.
Solution:
By definition, if an object has a constant velocity, then both the object's speed and its
direction of motion are con
Electromagnetism
(electric and magnetic phenomena)
This is about: electric charges, electromagnetic forces,
electromagnetic fields
and
I. Electrostatics
This is about: non-moving electric charges, electrostatic forces,
electrostatic fields.
and
(With very
Physics 101
Homework 4
Due January 26
1. The force of gravity on a 2-kg rock is twice as great as that on a 1-kg rock. Why then doesnt
the heavier rock fall faster?
Solution: The acceleration of both rocks is found by dividing their weight (the force of g
Physics 101
Homework 10
Due March 29
Name
#_
(You must show your work or explain your answers to get full credit, simply
writing a numerical answer is not sufficient. You can type your solutions on this file,
or write them on a separate page, or you can s
Physics 101
Homework 6
Due February 23
Name
#_
(You must show your work or explain your answers to get full credit, simply
writing a numerical answer is not sufficient. You can type your solutions on this file,
or write them on a separate page, or you can
Physics 101
Homework 9
Due March 22
Name
#_
(You must show your work or explain your answers to get full credit, simply
writing a numerical answer is not sufficient. You can type your solutions on this file,
or write them on a separate page, or you can sp
Physics 101
Homework 12
Due April 19
Name
#_
(You must show your work or explain your answers to get full credit, simply
writing a numerical answer is not sufficient. You can type your solutions on this file,
or write them on a separate page, or you can s
4. Electric potential
4.1 Electric (electrostatic) potential energy
Compare electric force and gravitational force
F k
q1 q 2
r2
m1m2
r2
F G
Conservative forces
We can introduce potential energy:
Example:
+
+
+
+
+
+
+
E x -
a
b
E 10 4 N / C
x 1cm
q 1C
U
III. Heat
1. Heat and energy
A little bit of history:
Old theories
Robert von Mayer (1814-1878)
James Joule (1818-1889)
Hermann von Helmholtz (18211894)
Calorie: the amount of heat required to raise the temperature
of 1 gram of water from 14.5C to 15.
Center of mass
1. Definitions
M mi
i
1
rcm
M
mi ri
i
rcm
vcm
; P pi
vcm
; acm
t
t
i
From these definitions follows:
P Mvcm
Fext Fi P t a cm
M
If total external force is zero than
center of mass experience zero
acceleration
1
2. Some
basic properties
Linear Momentum and Second Newtons Law
2nd Newtons Law:
Definition of acceleration:
F ma
We can write 2nd Newtons Law as:
v
F m
t
Definition of momentum:
v
a
t
Change in momentum:
p mv
p mv
1. Second Newtons Law in terms of momentum:
p
F
t
1
We can get
6. Centripetal force
2
F = ma
F
2
mv
2
m 2 r m
r
r
T
1
Example: A stone of mass m sits at the bottom of a bucket. A string is
attached to the bucket and the whole thing is made to move in circles.
What is the minimum speed that the bucket needs to ha
PHYSICS 101
(Physics for the Nonscientist)
Dr. Anatoli Frishman
[email protected]
Web Page: http:/course.physastro.iastate.edu/phys101/
1
Introduction
What is physics?
A science
A basic science
The most basic science
Discovered by several generations o
4. Friction
a) Kinetic friction:
f k k N
fk friction force
N normal force
k coefficient of kinetic friction
b) Static friction:
f s f s max s N
s - coefficient of static friction
k s
1
Example: When you push a book against a wall, the static friction be
10. Free fall
Free fall acceleration: g=9.8m/s2
Using general equations:
at 2
x x0 v0 t
2
v v0 at
2a x x0 v 2 v 02
v
x v0 v
t
2
Substitute:
a g
x y
To derive the following equations:
gt 2
y y 0 v0 t
2
v v 0 gt
2 g y y 0 v 2 v02
v
y v0 v
t
2
1
Example:
DYNAMICS
1. Newtons Three Laws
Newtons First Law
Existence of inertial systems of reference
In inertial system of reference, any object acted by no net force remains
at rest or continues its motion along straight line with constant velocity
Newtons Second
Oscillations
1. Different types of motion:
Uniform motion
1D motion with constant acceleration
Projectile motion
Circular motion
Oscillations
2. Different types of oscillations:
Periodic oscillations
A motion is called periodic when the system comes back
Thermodynamics
I. Temperature
1. Thermal equilibrium. Zeroth law of thermodynamics
a) We need a thermometer
b) Thermal equilibrium
c) Zeroth law:
If C is in thermal equilibrium with both A and B,
then A and B are also in thermal equilibrium with each othe
4. Distance and displacement
(displacement as an example of a vector)
Example 1: The distance between points A and B
is equal to the distance between A and C.
B
A
In contrast, the displacement from point A to point B
is not equal to the displacement from
Physics 101
Homework 8
September 20
A spring has a spring stiffness constant, k, of 400 N m . How much must this spring be stretched
to store 2.0 J of potential energy?
Solution:
2
The elastic potential energy is given by U 12 kx where x is the distance o
Physics 101
Homework 7
Due September 15
1. A stone is dropped from a height 20 m above the ground. If the initial speed is zero, find
speed of the stone just before it will reach the ground. (Neglect air resistance.)
Solution:
From the conservation of mec
Physics 101
Homework 6
Due September 13
1. Suppose a car moves at constant speed along a hilly road. Where does the car exert the
greatest and least forces on the road: (a) at the top of a hill, (b) at a dip between two hills, (c)
on a horizontal road?
So
Physics 101
Homework 5
Due September 8
1. What is the maximum acceleration a car can undergo if the coefficient of static friction
between the tires and the ground is 0.80?
Solution:
A free-body diagram for the accelerating car is shown. The car does not
Physics 101
Homework 2
Due August 30
1. Can an object have a varying speed if its velocity is constant? If yes, give examples.
Solution:
By definition, if an object has a constant velocity, then both the object's speed and its
direction of motion are cons
Physics 101 Syllabus
Fall 2016
Lecturer
Dr. Anatoli Frishman
[email protected]
210 Physics Bldg
294-9361
Lecture hours:
Office hours:
T&R 12:40-2:00 pm in room 5
Immediately after lecture, and by appointment
Course Secretary
Deb Schmidt
[email protected]
PHY 101: Lab 10 Magnetism and Induction
Directions: Run or download and open Faradays Electromagnetic Lab. Use the computer simulation to
answer the following questions. Submit this completed document for your assignment. This lab does not
require a forma
Uniform Circular Motion
Name:
Lab # 5
Class:
Date:
Purpose:
To analyze the relationship between the centripetal force acting on an object and the rotational speed
of that object
Procedures:
Apparatus:
N/A
Required
Materials:
1.
2.
3.
4.
5.
6.
Data:
Evalua
A wave is a disturbance that repeats itself regularly throughout time and space. We
experience waves in our daily lives in the forms of wind and water, light and sound. We utilize
them to listen to music on the radio and cook our food in the microwave. Fo
Linear Motion and Graphical Analysis
Name:
Lab # 2
Class:
Date:
Purpose:
To analyze the position, average velocity, and average acceleration of two objects for any given moment
in time.
Procedures:
Apparatus:
Spark Timer
Required
Materials:
Spark Timer Ta
Lab 8 Worksheet: Mechanical Waves and Sound
Go to the PhET Web site and run the Waves on a String application. You may need to download
the application first.
Part 1: Simulation Observations
1. Move the Damping slider to 0. Make sure the Fixed End button