Lesson Plan

Period #2 Unit One Exam / Velocity and Graphing

Materials : Textbook : Physics - Principles and Problems

Unit One Exam

Ticker Tape Lab #1 / Ticker Tape Lab #2 Sheet

Review : Hand in Lab Report #1, discuss questions

Once Exam is Complete, read pages 41 - 44 of Text

Objectives : students should be able to :

    1. define distance, displacement, speed, and velocity
      1. average speed, average velocity
      2. instantaneous speed, instantaneous velocity

2.6 construct displacement (and distance)-versus-time graphs
      1. uniform motion
      2. rest stops and return trips (negative velocities)
    1. use displacement-versus-time graphs to determine the displacement, average velocity, or instantaneous velocity of objects
    1. solve problems involving : displacement, time, average velocity

 

Part I - Speed and Velocity - Introduction and Notes :

See attached notes, starting "SPEED AND VELOCITY", page 2-9, define speed and velocity, and do example page 2-10

Solve velocity equation for d and t

See attached notes, starting "INSTANTANEOUS SPEED", page 2-9, differentiate between average speed and instantaneous speed.

 

Guided Study :

Calculate average speed and average velocity, use examples page 2-11, 2-12

Exercise :

Questions 1-4 page 45, 46 Practice Problems in Textbook

Questions 5-8 page 47 Practice Problems in Textbook

 

Evaluation :

Velocity Quiz

Unit Two Test

 

Part II - Displacement VS Time Graphs - Introduction and Notes :

Review velocity and discuss the use of a d vs t graph to find slope and calculate velocity. Use attached notes page 2-13, starting "UNIFORM VELOCITY"

Introduce Lab #2 - Investigation - Uniform Motion

Discuss Rest Stops and Negative velocities - see attached notes starting with "REST STOPS AND RETURN TRIPS", page 2-15, explain using overhead graph on page 2-16.

Guided Study :

Show overhead page 2-14, calculate the slope (point out that this is CONSTANT or UNIFORM velocity)

Exercise :

Lab #2 - Investigation - Uniform Motion

Evaluation :

Lab #2 - Investigation - Uniform Motion

Velocity Quiz

Unit Two Test

Displacement VS Time Graphs p. 2-17

can be used to determine average velocity and instantaneous velocity.

1. If the velocity is constant, or uniform, the line is STRAIGHT

    • the slope of the line is the average velocity (which is always the same)
    • the slope of a tangent to the line is the instantaneous velocity (since a tangent line on a straight line is the line itself, the instantaneous velocity equals the slope of the line, or the average velocity)

2. If the graph is a number of segments of straight lines :

    • the slope of a line connecting any two points is the average velocity between those two points.
    • the instantaneous velocity is a the slope of the line along which ever point you are interested (again since a tangent to a straight line is the line itself)

3. If the graph is curved, this indicates changing velocity (or acceleration)
    • the slope of a line connecting any two dots is the average velocity between those two dots.
    • the instantaneous velocity is a tangent line to the curve, drawn at the point of interest.