Lesson Plan on Rotational Motion
( A Lesson Intended for Fourth Year High School)
I. Objectives
At the end of the period, the students are expected to:
a. define rotational motion;
b. solve problems regarding rotational motion; and
c. differentiate translation and rotation.
II. Subject matter
Rotational Motion
Reference: Physics Textbook
a. Concepts:
ü Rotational motion is the motion of a rigid body which takes place in such a way that all of its particles move in circles about an axis with a common angular velocity of, it is the motion of a body turning about an axis.
ü The centers of all circular paths in a spinning object define a line, called the axis of rotation.
ü Angular displacement is the angle through which a rigid object rotates about a fixed axis. It is positive if it is counterclockwise and negative if it is clockwise. The SI Unit of angular displacement is radian (rad).
θ = angular displacement in rad. s = arc length
r = radius
ü Translational motion is a motion in which all points on the body travel on a parallel path (not necessarily straight lines).
ü In pure translation, there is no rotation of any line in the body. Because translation can occur along a curved line, it is often called curvilinear or linear motion.
b. Strategy: Lecture
c. Materials: computer, projector, and chalk board
III. Procedure
A. Preliminaries
1. Opening prayer
1. Opening prayer
Teacher 1: Please stand-up, prayer leader kindly lead the prayer.
Leader: Our father who art in heaven… Amen
Teacher 1: Please take your seat.
2. Checking of attendance
Teacher 1: Please be on your proper seat.
(The teacher will check the attendance through the seat plan.)
B. Initiatory activities
1. Review of previous lesson (Topic: Centripetal motion)
Teacher 1: This morning we will discuss another lesson which is still in line with force and motion. But before that, let us first recall your previous lesson. Anybody who could share to us what have we discussed last meeting?
Jessie: Ma’am, last meeting we have discussed the concept of centripetal motion.
Teacher 1: That’s right. What then is centripetal motion?
KC: Centripetal motion is the motion of as object in a circular path.
Teacher 1: Very good. What else have you learned last meeting?
Abigail: We have learned how to solve problems involving centripetal motion using the formula: Fc = mv2/r
Teacher 1: Ok. Thank you Abigail. We have here the objectives for our lesson this morning. Any volunteer to read it?
Mark: At the end of the period, the students are expected to:
a. define rotational motion;
b. solve problems regarding rotational motion; and
c. differentiate translation and rotation.
Teacher 1: Thank you Mark.
2. Motivation
Teacher 1: Class I have prepared here a short video presentation. I want you to focus your observation on the movements of the skater in the video. Afterwards I will ask you some questions. Are we all set?
Students: Yes Ma’am.
Activity: Film viewing
Teacher 1: So, did you enjoy the video?
Students: Yes Ma’am
Teacher 1: What have you observe on the movements of the skater in the video?
Michelle: Mostly of the movements of the skater is in circular path. There are movements which are stationary and there are movements also that do not stay in the same position.
Teacher 1: Very nice observation Michelle! Most of the skater’s movements are in a circular path. The skater does it in either stationary or locomotive manner. The skater projects an example of rotational motion which will be the subject of our discussion today.
C. Lesson Proper
A slideshow is presented to the whole class.
Teacher 2: We have already an idea of what rotational motion is. Now, I have here a definition of rotational motion. Any volunteer to read it?
Grace: Rotational motion is the motion of a rigid body which takes place in such a way that all of its particles move in circles about an axis with a common angular velocity of, it is the motion of a body turning about an axis.
Teacher 2: Ok, thank you. It is the motion in which the body moves with respect to its axis of rotation which is in the center of a moving body.
The teacher will continue to discuss as the slide show continues.
Application: Group activity – solving
Teacher 2: Now, I will group you into 5 members each. You will solve these problems for 5 minutes. You can write in any sheet. After that I will choose one representative from each group to present and explain the answer.
The teacher will now group the class.
After 5 minutes…
Teacher 2:. Exchange your paper with the row opposite to your row. Let’s see whether you already know how to solve problems regarding rotational motion. I want the group of Ivy, Hasnia and Pearl to show their solutions on the board.
The students will go to the board and present their solutions.
Teacher 2: Very good students. It seems that you already know the concept and apply it to word problems. Let’s do the angel clap for ourselves.
IV. Formative Assessment
Short Quiz (15 points)
Teacher 2:I believe everybody is ready for a quiz. Please get one-half sheet of intermediate paper. This time, it would be individual so work on your own if you don’t want your scores to be deducted. I will give you 10 minutes to do your work.
1. Define rotational motion in not more than three sentences. (5 points)
2. Differentiate rotational from translational motion. (5 points)
3. Problem Solving: A record has a diameter of 30.48 m. it rotates at the rate of 33.33 deg. Determine the distance measured along the arc that a point on the rim of the record has moved.
V. Assignment
In a one-half sheet of intermediate paper, differentiate angular velocity from angular acceleration to be submitted on our next meeting.
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