Understanding Weight and Its Measurement
Understanding Weight and Its Measurement
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Understanding Weight and Its Measurement
What do you already know about weight and mass?
Learning Objective
At the end of the lesson you will be able to explain the difference between mass and weight, describe how to measure weight using a spring balance, and apply your knowledge through differentiated activities.
Starter: What Do You Notice?
Look at the objects on your table. What might affect how heavy they feel? Discuss in pairs for two minutes.
Mass vs Weight
The amount of matter in an object. Measured in kilograms (kg). Does not change wherever the object goes.
Mass
The force with which gravity pulls on a mass. Measured in newtons (N). Changes with gravity.
Weight
Mass Does Not Change!
If you travel to the Moon, your mass stays the same, but your weight changes. Why? Gravity is weaker on the Moon.
How Weight Is Measured
Weight is a force. Measured with devices such as spring balances or force meters. The scale stretches when you hang an object; the reading shows the weight in newtons (N).
Spring Balance: Step-by-Step
1. Set spring balance to zero. 2. Attach object to hook. 3. Read weight in newtons (N).
Activity 1: Match the Statement
Match each statement to either mass or weight. Challenge: Can you give an example for each?
Activity 2: Investigate
Use spring balances to measure the weight of three different objects. Record and compare your results. Explain any differences.
Differentiated Challenge
A) Write a definition for mass and weight. B) Calculate the weight of a 2kg object on Earth and on the Moon (Moon’s gravity ≈ 1/6 of Earth’s). C) Design an investigation to find out if different spring balances give the same results.
Exit Ticket: What Have You Learned?
Write down (1) one thing you learned about the difference between weight and mass, (2) one way to measure weight, and (3) a question you still have.
Write down 3 things you learned in this lesson.
Write down 2 things you want to know more about.
Ask 1 question about something you haven't quite understood yet.
