Lesson 6: Relative Motion
Overview:
In this lesson, you will learn about frames of reference and relative motion. You will begin applying the “working with vectors” skills you developed previously as you learn how to solve relative motion problems. A computer simulation of Tarzan and Jane will help consolidate your knowledge and understanding. This will help us in the last unit, when we learn Einstein's Special Theory of Relativity!
Curriculum Expectations:
Specific Expectations:
B2.1 Use appropriate terminology related to dynamics, including, but not limited to: inertial and noninertial frames of reference, components, centripetal, period, frequency, static friction, and kinetic friction.
B2.2 Solve problems related to motion, including projectile and relative motion, by adding and subtracting twodimensional vector quantities, using vector diagrams, vector components, and algebraic methods.
B2.1 Use appropriate terminology related to dynamics, including, but not limited to: inertial and noninertial frames of reference, components, centripetal, period, frequency, static friction, and kinetic friction.
B2.2 Solve problems related to motion, including projectile and relative motion, by adding and subtracting twodimensional vector quantities, using vector diagrams, vector components, and algebraic methods.
Success Criteria:
 What is a frame of reference?
 What is relative velocity?
Time Allocation: 2 hours
Learning A
ctivities:Read pages 44  48 from Nelson 1.6
In the playlist below, video:
 Will explain the basic concept of relative velocity of an observer and a ball thrown out of a moving car.
 Will show you how to find the relative velocity of a person walking forward and backward of a moving train.
 Will show you how to find the driftdistance (by water) when a person swims upstream.
 Will show you how to find the angle and time needed for a person to swim straight across in an upstream river.
Practice questions 3, 5, 6 and 7 on page 48.
Task:
Solve questions 1, 2, 3 and 4 from Nelson 1.6 Review on page 49.
Quiz Chapter 1 on Moodle.
Optional Extension:
Quiz Chapter 1 on Moodle.
Optional Extension:
 Practice questions 8 and 9 from Nelson 1.6 on page 48.
 Solve questions 8 and 9 from Nelson 1.6 Review on page 49.
Reflect:
What new perspective on the motion of objects did your studies of relative motion and projectile motion give you? Consider why relative motion is important when launching rockets and probes for space exploration. Why does the fact that planets and other bodies in the solar system move with respect to each other make it necessary to apply concepts of relative motion?
Additional Resources:

The video will show you how to find the velocity of the boat, given time it takes a person to row up and downstream.


The video will show you how to find the time & velocity needed for a person to catch another person.
