Objects that sink in Water Basic Science Primary 2 Third Term Lesson Notes Week 9
Learn about objects that sink in water, their characteristics, and why heavy objects sink. Simple explanations for Primary 2 pupils to understand water’s effects on different objects.
Subject: Basic Science
Class: Primary 2
Term: Third Term
Week: 9
Topic: Water – Objects that Sink in Water
Sub-topic: Identify objects that sink in water; describe the characteristics of objects that flow in water; examine how heavy objects sink in water.
Duration: 1 hour
Behavioral Objectives:
- Identify objects that sink in water.
- Describe the characteristics of objects that flow in water.
- Examine how heavy objects sink in water.
Key Words:
- Float
- Sink
- Water
- Heavy
- Light
Entry Behavior: Pupils should already understand the concept of floating and sinking in water.
Learning Resources and Materials:
- Bowl of water
- Various objects (plastic, metal, wood, sponge, etc.)
- Chart paper
- Markers
Building Background/Connection to Prior Knowledge: Review what pupils learned in the previous class about objects that float in water.
Embedded Core Skills: Critical thinking, observation, communication
Learning Materials:
- Water
- Various objects for demonstration
- Worksheet for assessment
Reference Books: Lagos State Scheme of Work for Basic Science.
Instructional Materials: Bowl of water, various objects.
Content:
- Understanding objects that sink in water and their characteristics.
- Exploring how heavy objects sink in water.
- Meaning:
- When an object sinks in water, it goes down to the bottom of the water.
- Objects that sink in water:
- Metal objects like a coin or a spoon sink because they are heavy.
- Stones or rocks sink in water because they are very dense.
- Glass objects such as marbles or glass beads sink because they are heavier than water.
- Characteristics of objects that sink in water:
- Heavier: Objects that are heavier than water will sink.
- Denser: Objects that are very dense, like stones, sink because they don’t have much air inside them.
- Solid: Most solid objects will sink in water.
- How heavy objects sink in water:
- Gravity: Heavy objects are pulled down by gravity, causing them to sink.
- Density: If an object is denser than water, it will sink.
- Examples:
- Metal objects such as keys or a nail will sink because they are heavy.
- Stone or pebbles will sink because they are very dense.
- Glass objects such as a glass marble will sink because they are heavier than water.
- Activities:
- Experiment: Pupils can drop different objects in a bowl of water and observe if they sink or float.
- Observation: Pupils can watch how quickly objects sink in water.
Remember, when discussing this topic, always guide the pupils with safety measures and ensure no dangerous objects are being used for the activities. Let pupils enjoy learning about the objects that sink in water!
Water – Objects that Sink in Water” suitable for Primary 2 pupils:
- Q: What does it mean when an object sinks in water?
- A: It means the object goes down to the bottom of the water.
- Q: What are some objects that sink in water?
- A: Heavy objects like stones, metal keys, and marbles sink in water.
- Q: Why do metal objects sink in water?
- A: Metal objects sink because they are heavier and denser than water.
- Q: Do wooden sticks sink in water?
- A: No, wooden sticks usually float because they are lightweight.
- Q: What happens when you drop a stone in water?
- A: The stone will sink to the bottom of the water.
- Q: What is density?
- A: Density is how heavy an object is compared to its size.
- Q: What makes an object sink in water?
- A: If an object is heavier and denser than water, it will sink.
- Q: Do plastic toys sink in water?
- A: Most plastic toys float because they are lightweight, but some may sink if they are heavy.
- Q: How does glass behave in water?
- A: Glass objects like marbles sink because they are heavy and dense.
- Q: What is gravity?
- A: Gravity is the force that pulls objects down toward the Earth.
- Q: Why do some objects sink quickly in water?
- A: Objects sink quickly if they are very heavy and dense.
- Q: Can coins sink in water?
- A: Yes, coins sink because they are made of metal and are heavy.
- Q: Why do we use a basin of water for experiments?
- A: A basin of water lets us see which objects sink and which float.
- Q: What should we do to observe objects sinking in water?
- A: We can drop different objects in water and watch them sink.
- Q: Why is it important to know what sinks in water?
- A: It helps us understand how objects behave in water and how to keep safe when playing near water.
Presentation:
- Step 1: The teacher revises the previous topic which was about objects that float in water.
- Ask pupils to recall some objects that float in water and discuss why they do so.
- Objects that float in Water Basic Science Primary 2 Third Term Lesson Notes Week 8
- Step 2: The teacher introduces the new topic.
- Explain that some objects sink in water because they are heavy.
- Show examples of objects that sink in water, such as a metal spoon, a small rock, and a key.
- Step 3: The teacher allows the pupils to give their own contributions and the teacher corrects the pupils when and where necessary.
- Ask pupils to predict whether different objects will sink or float.
- Perform a demonstration with various objects and a bowl of water.
Teacher’s Activities:
- Explain why some objects sink and others float.
- Show pupils different objects and ask them to predict whether they will sink or float.
- Perform a demonstration with various objects.
Learners’ Activities:
- Observe the demonstration and take notes.
- Participate in discussions and share predictions.
- Fill in worksheets based on observations.
Assessment: Ask pupils questions about the objects that sink in water and their characteristics. Have them complete a worksheet identifying which objects sink and which float.
- Question: A metal spoon will __________ in water.
- a) float
- b) sink
- c) fly
- d) dance
- Question: A stone is __________ than water, so it sinks.
- a) lighter
- b) softer
- c) heavier
- d) smoother
- Question: When you put a glass marble in water, it will __________.
- a) float
- b) sink
- c) jump
- d) disappear
- Question: Objects that sink in water are usually __________.
- a) very light
- b) very dense
- c) very dry
- d) very shiny
- Question: A plastic bottle cap will __________ in water.
- a) float
- b) sink
- c) disappear
- d) break
- Question: When we put a heavy metal key in water, it will __________.
- a) float
- b) sink
- c) disappear
- d) swim
- Question: An apple is __________ than water, so it will float.
- a) heavier
- b) lighter
- c) bigger
- d) stronger
- Question: Objects that are heavy will __________ in water.
- a) float
- b) sink
- c) jump
- d) dance
- Question: A piece of wood will usually __________ in water.
- a) sink
- b) float
- c) disappear
- d) jump
- Question: A small rock will __________ in water.
- a) float
- b) sink
- c) dance
- d) fly
- Question: A large metal toy car will __________ in water.
- a) float
- b) sink
- c) swim
- d) disappear
- Question: Most metals are __________ than water, so they sink.
- a) lighter
- b) heavier
- c) softer
- d) rounder
- Question: When we drop a ball of clay in water, it will __________.
- a) float
- b) sink
- c) jump
- d) fly
- Question: Things that sink in water are often made of __________.
- a) metal
- b) paper
- c) cloth
- d) rubber
- Question: Most rocks and stones will __________ in water.
- a) float
- b) sink
- c) jump
- d) dance
Evaluation Questions:
- Name an object that sinks in water.
- Why does a metal spoon sink in water?
- What happens when a small rock is placed in water?
- Is a plastic toy likely to sink or float in water?
- What characteristic makes objects sink in water?
- Name a characteristic of heavy objects.
- What is heavier, a metal key or a piece of wood?
- Why do heavier objects sink in water?
- Does a leaf sink or float in water?
- What happens to a piece of paper when it is placed in water?
Conclusion:
- The teacher goes around to mark and offer feedback on pupils’ worksheets.
- Summarize the lesson, highlighting key points about why certain objects sink in water.
- Reinforce the importance of critical thinking when observing the behavior of objects in water.
