Which of the following statements is true? 

The correct answer is 3) The mass of an object is constant and does not change from place to place.

Key Points

• Mass is a fundamental property of an object that does not change regardless of location.
• The mass of an object is measured in kilograms (kg) and remains constant whether the object is on Earth, the Moon, or in space.
• Weight, on the other hand, is the force exerted by gravity on an object and can vary depending on the gravitational pull at different locations.
• Mass is a scalar quantity, meaning it only has magnitude, whereas weight is a vector quantity, having both magnitude and direction.

Additional Information

• Weight is calculated using the formula Weight = Mass × Gravitational Acceleration (W = mg).
• The gravitational acceleration on Earth is approximately 9.8 m/s², but this value can differ slightly depending on the location.
• On the Moon, the gravitational acceleration is about 1/6th of that on Earth, which is why objects weigh less on the Moon.
• Mass is commonly measured using a balance, which compares an unknown mass to a standard mass.
• Inertia is a concept related to mass, describing an object's resistance to changes in its state of motion.