Radi 121 Fall 2017


Unit 1  Math review, units, and 1 dimensional motion

 Unit conversions

Unit Conversions 2


Introduction to velocity

How to find displacement from a velocity graph

Another example of using velocity graph

 motion ex 1

 motion ex 2

Trapper’s cow

Max height of a rocket


Help with 7-10

help with 12 AND 13







Unit  2  Newtons Laws of Motion

 Introduction to Newtons First Law

Introduction to Newtons Second Law

Newton Second Law example. Bill pushing a car

Net force on an accelerating car

Timmy in an elevator

Help with 11

problems 1 though 5



 Week 3  Principles of Work and Energy

Introduction to work

Introduction to energy

how is gravitational PE calculated

Introduction to the work energy theorem

Energy example -2

Energy example -1

Energy example 0

Energy  example 1

energy example 2





Week 4  Power

Introduction to Power

How to calculate average power


Week 5  Charge, the Coulomb Force, and the Electric Field



Protons, neutrons, and electrons

Introduction to Coulomb Force

Example of calculating Coulomb Force

Intro to Electric field

Introduction to the Electric Field

How to draw electric field vectors

How to calculate an electric field from 2 point charges

Introduction to Electric Potential


Week 6   DC circuits


electrical power

Another power video

How to draw a circuit

dc circuit example

Hi folks, in the video set below, please watch from what is charge? through intro to current and ohms law. Please take notes ( 1 page per video) to present Monday to get your 5 pts. See you then. Rod  10-20-17



What is charge?

How to calculate the coulomb force

Concepts of batteries


Intro to current and ohms law


simple circuit example

simple circuit example 2

an example of a proton accelerated by a potential difference

Help with HW numbers 1-5

Help with HW 6-9

Help with HW 14,15,21











Week 7  The Magnetic Field and Magnetic Flux

 intro to magnetic (B) fields

magnetic versus electric fields

Right Hand Rule

RHR examples

magnetic field around wires

magnetic flux

Week 8 AC Voltage 

intro to AC voltage

Intro to Faradays Law of Induction


overview of vector fields

help with magnetism hw

help with AC circuits and transformers


1 and 6




Videos below are Hot off the press (11-8-17)

help with 11-16

help with 18,19,20


Some answers for you

5 b       2.46 *10^14 m/s^2

12a    1.6 *10^-12N   b  9.6*10^14 m/s^2


13   v= 3*10^7 m/s so Fmax= 8.7*10^-12 N

14  .0032Tm^2


15a.    .0000002Tm^2

16 a  B=.17T

18a      577 ohms

20      lamp 3   current =  .83 amps     R=145ohms


21   Voltage out of transformer = 9.8 volts

Power =1.5 watts






Week 9 Atomic Structure 

Protons  Neutrons Electrons

Structure of the atom


Week 10 Waves and EM Radiation

Intro to waves

Electromagnetic radiation

Electromagnetic spectrum

Structure of the atom


Inverse square law

inverse square law example


Atomic Spectra and Bohr theory

Intro to Bohr Theory of the Atom

Intro to Bohr Theory II

How to find a photon frequency for a Hydrogen Atom

Example 2 for finding photon frequencies


overview of waves and hydrogen atom

Help with 13,14, and 15 under Electromagnetic Waves and atoms

Some answers to  your hw over Electromagnetic Waves and atoms

3.a  10.2ev

6   3.6keV

9 b   3.2*10^14 hz

13 b  619 km/s