PHY2020-001
Lecture 10 (02/12)
Instructor : Gauri R. Pradhan
Recall
Summary so far
Matter is made of atoms
Atoms are made of positively charged
protons, electrically neutral neutrons and
negatively charged electrons
Ions are negatively or positively charg

PHY2020-001
Lecture 11 (02/17)
Instructor : Gauri R. Pradhan
Recall
Density
Amount of mass per unit volume of a
material.
Density = Mass/Volume
Unit of density is kg/m3
Example:
Density of water is 1000 kg/m3
It does not matter if it is a spoonful of w

PHY2020-001
Lecture 17 (03/19)
Instructor : Gauri R. Pradhan
Electricity: what is it about?
It is a name given to a wide range of
phenomena:
Lightning in the sky, a spark when we strike
a match or when we talk about say a
brightly lit city like NY that n

PHY2020-001
Lecture 16 (03/17)
Instructor : Gauri R. Pradhan
Recall
Summary of equations
wave speed = frequency x wavelength
frequency = 1/period
period = 1/frequency
wave speed = wavelength/period
Question:
If some animal in water emits a sound of 57Hz.

PHY2020-001
Lecture 7 (01/29)
More about Gravitation and Review I
Understanding motion
Instructor : Gauri R. Pradhan
Recall
Keplers laws
Keplers First Law
All
planets move in elliptical orbits with the Sun at one focus
Keplers Second Law
The radius vecto

PHY2020-001
Lecture 4 (01/20)
Instructor : Gauri R. Pradhan
Recall
Summary of equations
distance
speed =
time
total distance covered
average speed =
time interval
change in velocity
acceleration =
time interval
velocity acquired in free fall from rest: v=

PHY2020-001
Lecture 9 (02/10)
Instructor : Gauri R. Pradhan
Recall
2
Characteristics of atoms
Incredibly tiny
Numerous
Perpetually in motion
Ageless
Fundamental facts about atoms
1. Every atom is composed of a positively charged
nucleus surrounded by nega

PHY2020-001
Lecture 5 (01/22)
Instructor : Gauri R. Pradhan
Last time.
net force
acceleration =
mass
Weight=mg
F=ma
Impulse = Ft = (mv)
Law of conservation of momentum
(net mv)before = (net mv)after
Continued
We
got introduced to work,kinetic energy, and

PHY2020-001
Lecture 6 (01/27)
Instructor : Gauri R. Pradhan
Recall
Last couple of classes
We
learnt work, kinetic energy, and potential energy
W = Force x displacement
Gravitational potential energy = mgh
K = mv2
Work-energy theorem: work = K E
More abou

PHY2020-001
Lecture 3 (01/15)
Instructor : Gauri R. Pradhan
Recall
Newtons first law of motion (the law
of inertia)
A restatement of Galileos concept of
inertia : states that every object
continues in a state of rest or of
uniform speed in a straight line

PHY2020-001
Lecture 2 (01/13)
Instructor : Gauri R. Pradhan
Recall
Paul G. Hewitt
Conceptual Physics, 12th edition
This is your required course
material
You will need this material
and lecture notes for:
- in-semester tests
- homework assignments (not
co

PHY2020-001
Instructor : Gauri R. Pradhan
Paul G. Hewitt
Conceptual Physics, 12th edition
This is your required course
material
You will need this material
and lecture notes for:
- in-semester tests
- homework assignments (not
collected/not graded)
Canva