Gravity and Weight

🌍 A) Concept Challenge

Answer in 1–2 lines:

1. If gravity did not exist, what would happen to objects on Earth?

2. Why do astronauts appear “weightless” in space if gravity still exists?

3. Is weight a property of the object or of the environment? Explain.

⚖️ B) Mass vs Weight

A student has a mass of 60 kg.

1. Calculate their weight on Earth (g = 9.8 m/s²).

2. Calculate their weight on the Moon (g = 1.6 m/s²).

3. What changes: mass, weight, or both? Explain clearly.

🧠 C) Order the System

Organize the following in a logical chain:

• Gravity

• Mass

• Weight

• Force

Write the correct order and explain why that order makes sense.

🔍 D) Identify the Concept

For each situation, write Gravity / Mass / Weight and justify:

1. A scale shows 700 N → ______

2. An object is harder to push → ______

3. An astronaut floats → ______

4. The Earth attracts objects → ______

🔥 E) Real-Life Problem

A suitcase has mass 20 kg.

1. Calculate its weight on Earth.

2. If taken to a planet where g = 20 m/s², what is the new weight?

3. Would it be harder or easier to carry? Explain physically.

🧩 F) Challenge

Two objects fall: a heavy rock and a light book.

1. Which hits the ground first (ignore air resistance)?

2. Explain using gravity (not intuition).