Rotary/Rotational Motion

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Subject: Physics

Semester: 1

Period: 1

Week: 5

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School Name:

Teacher’s Name:

Subject: Physics

Grade Level: Grade 11

Week & Period: Week 5, Period I

Date:

Sub-topic: Rotary/Rotational Motion

Learning Objectives

By the end of this lesson, learners should be able to:

1. Define rotary/rotational motion and differentiate it from linear motion.
2. Explain angular displacement, angular velocity, and angular acceleration.
3. Calculate quantities related to rotational motion.
4. Identify examples and applications of rotary motion.

 

Previous Knowledge

Learners should understand linear motion, velocity, acceleration, and circular motion concepts.

 

Instructional Materials

• Rotating discs or turntables
• Stopwatch
• Meter rule
• Whiteboard and markers

 

Anticipation (Warm-Up) – 5 minutes

Ask:

• “What kind of motion does a spinning wheel exhibit?”
• “How is rotary motion different from straight-line motion?”
  Introduce rotary motion as motion about a fixed axis.

 

Building Knowledge (Main Lesson) – 25 minutes

1. Definition:

• Rotary or rotational motion is the motion of a body about a fixed axis or point.

    

 

 

Learners’ Activities

• Spin a disc and time the rotations to calculate angular velocity.
• Calculate angular displacement for different time intervals.
• Discuss real-life examples: wheels, fans, clocks.

 

Consolidation (Review and Assessment) – 10 minutes

Oral Questions:

• Define angular velocity and angular acceleration.
• Calculate the angular velocity of a wheel that completes 30 revolutions in 10 seconds.
• How does angular velocity relate to tangential velocity?

 

Homework / Assignment

• A wheel accelerates from rest at 3 rad/s² for 4 seconds. Calculate the angular displacement.
• List 5 examples of rotary motion in machines.

 

Notes – Detailed and Explained

• Rotary motion differs from linear motion by revolving about a fixed axis.
• Angular quantities describe rotational motion and are closely related to linear quantities.
• Understanding rotary motion helps in analyzing rotating machinery and wheels.

 

Expanded Notes / Instructions

• Emphasize units of angular measurement (radians).
• Demonstrate the relationship between linear and angular quantities with practical examples.

 

Inclusive / Differentiation

• Use rotating discs for hands-on learning.
• Visual aids for conceptual understanding.
• Step-by-step guidance in calculations.

 

Teacher’s Reflection (Post-Lesson Questions)

• Did learners understand the difference between linear and rotational motion?
• Were learners able to calculate angular quantities accurately?
• Did practical activities enhance understanding?