Lesson Notes By Weeks and Term v3 - Primary 6
Force
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Force
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Subject: Basic Science
Class: Primary 6
Term: 2nd Term
Week: 3
Theme: Learning About Our Environment
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explain for ces as a push or pull give examples of for ces – gravity, friction, magnetic etc demonstrate the effect of for ce on objects explain Frictional For ce as the resistance between two surfaces in contact mention in stances of the application of Frictional For ce in daily activities state the advantages and disadvantages of friction
Nature of surfaces: Rougher surfaces produce more friction than smoother ones. (e.g., a car tyre on a tarred road vs. on ice). Weight/Force pressing the surfaces together: The heavier an object, the more it presses down, increasing the interlocking of surfaces and thus increasing friction. (e.g., it's harder to push a full wheelbarrow than an empty one). 2.
5. Instances of the Application of Frictional Force in Daily Activities (Nigerian Context) Friction is crucial in many everyday tasks:
1. Walking and Running: Friction between our shoes and the ground allows us to push off and move forward without slipping. Without it, we would constantly slip, especially on wet or icy surfaces.
2. Braking Systems: The brakes in bicycles, cars, and okada (motorcycles) work by creating friction between brake pads/linings and the wheels, slowing them down and eventually stopping them.
3. Writing and Drawing: Friction between the pen/pencil tip and the paper surface allows ink/graphite to be deposited, making writing possible.
4. Grinding and Pounding: Friction is essential when using a grinding stone to grind pepper/tomatoes or using a mortar and pestle to pound yam/fufu. The rubbing action breaks down the food.
5. Holding Objects: We can hold objects (e.g., a cup, a book) because of the friction between our fingers and the object's surface. Nails and screws hold wood or walls together due to friction.
6. Striking a Match: The head of a matchstick ignites due to the friction generated when rubbed against the rough surface of the matchbox.
7. Climbing Trees/Ropes: Friction between hands/feet and the tree bark or rope is essential for climbing. 2.
6. Advantages and Disadvantages of Friction Advantages of Friction:
1. Enables Movement: Allows walking, running, cycling, and driving without slipping.
2. Allows Braking: Essential for stopping vehicles and machines, ensuring safety.
3. Holds Things Together: Nails, screws, and knots rely on friction to stay in place.
4. Facilitates Writing and Drawing: Allows pen/pencil to leave marks on paper.
5. Allows Gripping: Enables us to hold objects firmly.
6. Produces Heat (in some cases useful): Used in striking matches to produce fire.
Disadvantages of Friction:
1. Causes Wear and Tear: Leads to the wearing out of shoe soles, tyre treads, machine parts (e.g., engine components), and clothing. This requires frequent replacement, leading to costs.
2. Produces Unwanted Heat: In machines, friction generates heat that can damage components and reduce efficiency.
3. Wastes Energy: Engines and machines have to work harder to overcome friction, leading to a loss of useful energy and higher fuel consumption (e.g., in vehicles).
4. Opposes Motion: Makes it harder to move heavy objects, requiring more effort or force. This is why pushing a heavy load on a rough road is difficult.
5. Causes Noise: Moving parts rubbing against each other due to friction can generate undesirable noise. --- This section provides the essential content for the teacher to deliver the lesson comprehensively. 2.
1. Definition of Force Force is an external agent capable of changing the state of rest or motion of an object. More simply, force is defined as a push or a pull. Whenever an object moves, stops, changes direction, or changes shape, a force is at play.
Push: An action that moves an object away from one's body (e.g., pushing a car, pushing a door open, kicking a football).
Pull: An action that moves an object towards one's body (e.g., pulling a rope, pulling a door shut, pulling a bucket of water from a well). 2.
2. Effects of Force on Objects Force can produce several observable effects on objects: Starts a stationary object moving: A stationary football starts moving when kicked (a push). A sleeping mat starts moving when someone pulls it.
Stops a moving object: A goalkeeper applies force to stop a moving football. Applying brakes stops a moving bicycle or car.
Changes the direction of a moving object: A football player heads a ball to change its direction. A driver steers a vehicle, applying force to change its direction.
Changes the speed of a moving object: Pushing a swing harder makes it go faster. Applying brakes on a bicycle slows it down. Changes the shape and/or size of an object: Squeezing a sponge or clay changes its shape. Hammering a metal sheet flattens it. Stretching a rubber band changes its size. 2.
3. Examples of Forces Several types of forces are common in our environment: Gravity (Gravitational Force): This is the force of attraction exerted by the Earth on all objects towards its centre. It is what makes objects fall downwards. Nigerian Context
Examples: A mango falling from a tree; water flowing down a hill or a waterfall; why a house stands firmly on the ground; why a ball thrown upwards always comes back down.
Friction (Frictional Force): This is the force that opposes motion when two surfaces are in contact and rub against each other. It always acts in the opposite direction to the motion. (Detailed explanation below).
Magnetic Force: This is the force of attraction or repulsion exerted by a magnet on certain metallic materials (like iron, nickel, cobalt). Nigerian Context
Examples: A child using a magnet to pick up pins or paper clips from the floor; the force that holds a magnet to a refrigerator door; magnetic clasps on bags.
Muscular Force: The force exerted by the muscles of living beings (humans and animals) to perform various activities. Nigerian Context
Examples: Pushing a wheelbarrow of farm produce; pulling a stubborn goat; lifting a heavy bag of rice; paddling a canoe; sweeping the floor.
Elastic Force: The force exerted by an elastic material (like a rubber band or spring) when it is stretched or compressed, trying to return to its original shape. Nigerian Context
Examples: A rubber band used to tie hair or documents; the spring in a pen or a toy car. 2.
4. Frictional Force Frictional force is the resistance encountered when two surfaces are in contact and attempt to move or slide past each other. It always acts to oppose the relative motion or tendency of motion between the surfaces.
How it works: Even seemingly smooth surfaces have tiny bumps and dips (microscopic irregularities). When two surfaces are pressed together, these irregularities interlock, creating resistance. The rougher the surfaces, the greater the interlocking and thus, the greater the friction.
Factors affecting friction: Nature of surfaces: Rougher surfaces produce more friction than smoother ones. (e.g., a car tyre on a tarred road vs. on ice). Weight/Force pressing the surfaces together: The heavier an object, the more it presses down, increasing the interlocking of surfaces and thus increasing friction. (e.g., it's harder to push a full wheelbarrow than an empty one). 2.
5. Instances of the Application of Frictional Force in Daily Activities (Nigerian Context) Friction is crucial in many everyday tasks:
1. Walking and Running: Friction between our shoes and the ground allows us to This section outlines the step-by-step approach to delivering the lesson. 3.
1. Introduction (10 minutes)
Teacher Activity: Begin by asking students to perform simple actions: "Push your pencil case across the table," "Pull your chair closer." Ask: "What did you do to make these objects move?" Teacher Activity: Introduce the term "Force" as the common factor in all these actions (push or pull). Elicit examples of pushes and pulls from their daily lives (e.g., pushing a wheelbarrow, pulling water from a well, kicking a football).
Student Activity: Students actively participate by performing the actions and contributing examples of pushes and pulls. 3.
2. Exploring Force and Its Effects (15 minutes)
Teacher Activity: Define force as a push or a pull. Guide students to understand the effects of force through demonstrations using readily available classroom materials.
Demonstration 1 (Starts/Stops movement): Place a book on the table. Push it to make it move. Apply force to stop its movement.
Demonstration 2 (Changes direction): Roll a ball gently across the floor. Use a ruler or hand to push it from the side, changing its direction.
Demonstration 3 (Changes shape): Show a piece of clay, sponge, or paper. Apply force to change its shape (squashing, crumpling).
Teacher Activity: Introduce other types of forces: Gravity: Drop a pen or duster.
Ask: "Why did it fall downwards?" Explain gravity as Earth's pull.
Magnetic Force: Use a small magnet and some pins or paper clips. Demonstrate the magnet's ability to attract the pins without touching.
Muscular Force: Ask students to show how they use their muscles to lift a bag or push a table.
Student Activity: Students observe the demonstrations, describe the effects of the force, and identify the types of forces at play. They can also try simple pushes/pulls on their own materials (e.g., squeezing a pencil eraser). 3.
3. Understanding Frictional Force (20 minutes)
Teacher Activity: Introduce friction.
Ask: "When you pushed the book earlier, did it stop immediately or slide a bit? What made it stop?" Teacher Activity: Define frictional force as the resistance when two surfaces rub against each other. Explain how it opposes motion.
Demonstration 4 (Friction): Have students push a book across a smooth table. Then, place a piece of rough fabric (e.g., jute sack, rough cloth) on the table and ask them to push the book across it.
Ask: "Which surface was harder to push the book on? Why?" Explain that the rougher surface had more friction.
Teacher Activity: Lead a discussion on where friction is useful and where it's a problem, specifically relating to Nigerian daily activities.
Examples for discussion:* Why tires have treads (to increase friction), why we use oil in engines (to reduce friction), why our shoes wear out.
Student Activity: Students participate in the friction demonstration, compare the effort needed, and contribute examples of friction from their daily lives (e.g., walking on a slippery floor, grinding pepper). 3.
4. Advantages and Disadvantages of Friction (15 minutes)
Teacher Activity: Divide the class into small groups (e.g., 3-4 students per group).
Teacher Activity: Instruct each group to brainstorm and list: At least three advantages of friction. At least three disadvantages of friction. Encourage them to think about examples from their homes, schools, and communities.
Teacher Activity: After a few minutes, have each group share their findings. Facilitate a class discussion, clarifying and adding to their points using the comprehensive explanations in Section 2.
6. Student Activity: Students work in groups, brainstorm, list, and present their findings. They actively listen and contribute to the class discussion. 3.
5. Conclusion & Review (5 minutes)
Teacher Activity: Briefly summarise the key points covered: definition of force, its effects, examples of forces (gravity, friction, magnetic), definition of friction, and its advantages/disadvantages.
Teacher Activity: Address any lingering questions from students. --- This section provides scaffolded questions to check understanding during the lesson, with detailed solutions for the teacher.
Question 1: What is force? Give two examples of actions you perform daily that involve force.
Solution 1: Force is a push or a pull.
Example 1: Kicking a football (a push).
Example 2: Pulling a bucket of water from a well (a pull). (Other valid examples: Pushing a door, pulling a chair, lifting a bag, sweeping the floor).* Question 2: A Keke Napep (tricycle) driver applies the brakes suddenly. What effect does the force applied to the brakes have on the Keke Napep? Also, name the specific type of force involved in stopping the Keke Napep by braking.
Solution 2: The force applied to the brakes causes the Keke Napep to stop moving (or slow down significantly). The specific type of force involved in stopping the Keke Napep by braking is frictional force (between the brake pads and the wheel drum/disc).
Question 3: You are trying to move a very heavy bag of yam across a rough concrete floor. What type of force makes it difficult to move the bag, and how can you reduce this difficulty?
Solution 3: The type of force that makes it difficult to move the bag is frictional force. To reduce this difficulty, one could: Place the bag on a smooth surface, like a piece of cardboard or wood, before pushing. Place the bag on a trolley or use wheels to reduce the contact area and replace sliding friction with rolling friction (which is generally less). Lift the bag slightly while pushing to reduce the weight pressing down on the floor, thus reducing friction.
Question 4: Mention two advantages and two disadvantages of friction that relate to driving a car or riding an okada in Nigeria.
Solution 4: Advantages of friction (in driving/riding): Allows movement: Friction between the tyres and the road provides grip, enabling the vehicle to move forward without skidding.
Enables braking: Friction in the brake system allows the vehicle to slow down and stop safely. Disadvantages of friction (in driving/riding): Causes wear and tear: Friction wears out the vehicle's tyres and brake pads, requiring frequent replacement, which costs money.
Wastes fuel/energy: The engine has to work harder to overcome friction in moving parts (like the engine and transmission), leading to higher fuel consumption. ---
Connecting the topic of force to real-life situations helps students appreciate its relevance and apply their knowledge practically.
Community Safety and Transportation: Application: Understanding friction is vital for road safety in Nigeria. The friction between vehicle tyres and the road prevents skidding, especially during rain. Brake systems in okada, Keke Napep, and cars rely entirely on friction to stop.
Integration: Discuss why worn-out tyres are dangerous and how important it is for drivers to maintain their brakes. Students can observe different tyre treads on vehicles around their school or community and discuss their purpose.
Agriculture and Local Crafts: Application: Muscular force is extensively used in Nigerian agriculture (e.g., pulling water from wells for irrigation, tilling soil with hoes, carrying farm produce). Frictional force is crucial in traditional food processing methods like grinding melon seeds or pepper on a grinding stone, or pounding yam in a mortar with a pestle.
Integration: Ask students to describe how their parents or neighbours use force in farming or preparing local dishes. They can discuss how friction aids the process of breaking down ingredients.
Sports and Play: Application: Many traditional Nigerian games and modern sports involve various forces. Kicking a football, throwing a stone, wrestling, or pulling a rope in a tug-of-war are all direct applications of force. Gravity brings the ball down, muscular force moves it, and friction helps players maintain grip.
Integration: Encourage students to identify the different forces at play during their break time games or when watching football. For instance, when a player headers a ball, they apply force to change its direction and speed. ---