What is the amount of matter in an object called?

• A. Mass
• B. Weight
• C. Force
• D. Gravity

Answer: (A)

Mass is the amount of matter in an object. It tells us how much stuff there is and stays the same no matter where the object is. So your mass on Earth would be the same on the Moon, even though your weight would be different because gravity changes. Mass is measured in grams or kilograms and is often determined with a balance, which compares the object's mass to standard masses. Mass is also related to inertia—the tendency of an object to resist changes in motion. The other terms describe different ideas: weight is the gravitational force on the object, gravity is the force of attraction itself, and force is any push or pull.