Linear Momentum and Types of Collision J s 3 3rd Term
CLASS: JSS 3
SUBJECT: Basic Science
LESSON TITLE: Momentum
SUBTITLE: Linear Momentum and Types of Collision
PERIOD: 1
DURATION: 80 minutes
LEARNING OBJECTIVES
By the end of the lesson, students should be able to:
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Explain the term “momentum”
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Identify the formula for momentum
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Solve basic problems involving momentum
Linear Momentum and Types of Collision J s 3 3rd Term
KEY VOCABULARY WORDS:
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Mass
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Velocity
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Linear
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Quantity
RESOURCES AND MATERIALS:
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Chalkboard or whiteboard
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Marker/chalk
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A small ball or object for demonstration
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Chart showing formula and law of momentum
BUILDING BACKGROUND/ CONNECTION TO KNOWLEDGE:
Students have previously learned about force and motion. Momentum builds on these concepts by introducing the idea of how mass and velocity combine to describe motion in a more complete way.
CONTENT:
1. Definition of Momentum
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Momentum is the quantity of motion a moving body has.
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It is a product of mass and velocity.
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Formula: Momentum (p) = Mass (m) × Velocity (v)
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SI Unit: kg·m/s
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2. Explanation and Demonstration
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A ball of 2kg moving at 3 m/s has a momentum of:
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p = 2 × 3 = 6 kg·m/s
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The more massive or faster an object, the more momentum it has.
3. Real-life Examples
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A truck and a bicycle moving at the same speed do not have the same momentum. The truck has more because it has more mass.
WRAP UP & ASSESSMENT:
Recap Questions:
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What is momentum?
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What is the formula for momentum?
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What is the unit of momentum?
Classwork:
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A car of mass 1000kg is moving at 20 m/s. What is its momentum?
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A boy throws a 0.5kg stone at 10 m/s. Find the momentum.
ASSIGNMENT:
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Define momentum.
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A bike of mass 25 kg moves at 2 m/s. Find its momentum.
Linear Momentum and Types of Collision J s 3 3rd Term
PERIOD: 2
DURATION: 80 minutes
LEARNING OBJECTIVES
By the end of the lesson, students should be able to:
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State the law of conservation of linear momentum
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Distinguish between elastic and inelastic collisions
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Identify the importance and application of momentum in daily life
KEY VOCABULARY WORDS:
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Elastic collision
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Inelastic collision
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Conservation
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Impact
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Newton’s laws
RESOURCES AND MATERIALS:
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Diagrams of collisions
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Simple simulation or video showing collisions
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Soft balls or objects for class demo
BUILDING BACKGROUND/ CONNECTION TO KNOWLEDGE:
Students now understand what momentum is. This lesson expands on how momentum behaves during interactions like collisions.
CONTENT:
1. Law of Conservation of Linear Momentum
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In a closed system (no external forces), the total momentum before a collision is equal to the total momentum after the collision.
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Formula:
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m₁v₁ + m₂v₂ = m₁v₁’ + m₂v₂’
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2. Types of Collisions
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Elastic Collision:
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Total kinetic energy and momentum are conserved.
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Example: Bouncing of two rubber balls.
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Inelastic Collision:
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Momentum is conserved, but kinetic energy is not.
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Example: Car crash where vehicles stick together.
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3. Real-Life Applications of Momentum
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Airbags in cars help reduce momentum gradually to prevent injury.
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Helmets reduce the force of impact in sports.
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Athletes use momentum (e.g., high jump, boxing) to enhance performance.
WRAP UP & ASSESSMENT:
Discussion Questions:
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What happens to momentum in a collision?
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What is the difference between elastic and inelastic collision?
Classwork:
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Explain with examples the difference between elastic and inelastic collision.
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Two trolleys collide. One has a mass of 2kg at 4 m/s, the other 1kg at rest. After collision, both move at 2 m/s. Show that momentum is conserved.
ASSIGNMENT:
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Write short notes on the two types of collisions.
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State and explain the law of conservation of momentum with a diagram.
HOD/VP’S COMMENT & ENDORSEMENT:
