Lesson Plan

Period #3 More Graphing

Materials : Textbook : Physics - Principles and Problems

Marked Unit One Exams

Velocity Fun Sheet

Review : Hand in Lab Report #2, discuss questions

Go Over Unit One Exam

Go over Questions 1-8 on pages 45-47 of textbook

Objectives : students should be able to :

2.6 construct displacement (and distance)-versus-time graphs

1. uniform motion
2. rest stops and return trips (negative velocities)

6. construct velocity (and speed)-versus-time graphs
7. use displacement-versus-time graphs to determine the displacement, average velocity, or instantaneous velocity of objects
8. use velocity-versus-time graphs to determine the displacement or velocity of objects

2.9 solve problems involving : displacement, time, average velocity

 

Part I - Displacement vs Time Graphs - Introduction and Notes :

Give Notes starting at "Displacement VS Time Graphs" p. 2-17, and discuss ways of calculating average and instantaneous velocities

Use overhead of graph on page 2-16 to calculate average velocity between two points.

 

Guided Study :

Plot graph on page 2-18 using overhead and answer questions 1-5 on overhead, as an example of non-uniform velocity.

Have students calculate average velocity between two points on overhead of graph 2-20 as practice.

Exercise :

Questions 10-12 page 53 Practice Problems in Textbook

 

Part II - Velocityt vs Time Graphs - Introduction and Notes :

Give Notes starting at "Velocity VS Time Graphs" p. 2-23, and discuss ways of calculating distance using such a graph

Use overhead of graphs on page 2-24 and 2-25 to calculate displacement between two points on the graph by finding the area under the curve

 

Guided Study :

Plot graph on page 2-18 using overhead and answer questions 1-5 on overhead, as an example of non-uniform velocity.

Have students calculate average velocity between two points on overhead of graph 2-20 as practice.

Exercise :

Questions 13-18 page 55 Practice Problems in Textbook

Start Velocity Fun Sheet

Evaluation :

Velocity Fun Sheet

Velocity Quiz

Unit Two Test

Velocity Vs Time Graphs 2-23

• can be used to describe motion with constant or changing velocity
• the area under the line on a velocity time graph is equal to the displacement of the object from its original position

d = v t area = l w (the units work!)

• when velocity is constant, the graph is simply a straight horizontal line
• finding the area underneath is like finding the area under a rectangle A = lw (see graph on page 2 -24)
• when velocity is changing constantly, the line is straight and at an angle
• finding the area underneath is like finding the area of a triangle A = ½ bh (see graph on page 2 - 25)