**Correct Option: A. Mass is the amount of matter in an object, while weight is the force exerted by gravity on that object.** ### Detailed Explanation: 1. **Understanding Mass:** - Mass is a measure of the amount of matter in an object. It is a scalar quantity, which means it has magnitude but no direction. The standard unit of mass in the International System of Units (SI) is the kilogram (kg). - Mass is an intrinsic property of an object; it does not change regardless of the object's location in the universe. For example, a 10 kg object on Earth has the same mass as a 10 kg object on the Moon or in space. 2. **Understanding Weight:** - Weight, on the other hand, is the force exerted on an object due to gravity. It is a vector quantity, which means it has both magnitude and direction (toward the center of the gravitational body, like Earth). - The formula for weight (W) is given by: \[ W = m \cdot g \] where \( m \) is the mass of the object and \( g \) is the acceleration due to gravity (approximately \( 9.81 \, \text{m/s}^2 \) on Earth). - Since \( g \) can vary depending on where you are (for example, it is less on the Moon than on Earth), the weight of an object can change based on its location. 3. **Why Option A is Correct:** - Option A correctly states that mass is the amount of matter in an object, while weight is the gravitational force acting on that object. This distinction is fundamental in physics and helps clarify the relationship between mass and weight. ### Why the Other Options are Incorrect: - **Option B: Mass is dependent on the gravitational field strength, while weight is constant regardless of location.** - This statement is incorrect because mass is not dependent on gravitational field strength; it remains constant regardless of location. Weight, however, does depend on the gravitational field strength, as it is calculated using the acceleration due to gravity. - **Option C: Mass is measured in newtons, while weight is measured in kilograms.** - This option is incorrect because it confuses the units of measurement. Mass is measured in kilograms (kg), while weight is measured in newtons (N). The newton is the unit of force in the SI system, and since weight is a force, it is expressed in newtons. - **Option D: Mass can change with location, but weight remains the same everywhere in the universe.** - This statement is also incorrect. Mass does not change with location; it is an intrinsic property of matter. Weight, however, does change with location due to variations in gravitational acceleration. ### Common Pitfalls: - Confusing mass and weight is a common mistake. Remember that mass is a measure of matter, while weight is a force due to gravity. - Forgetting that weight can change based on location (e.g., on different planets) while mass remains constant. ### Revision Summary: - **Mass** is the amount of matter in an object and is measured in **kilograms (kg)**. - **Weight** is the force due to gravity acting on an object and is measured in **newtons (N)**. - Mass is **constant** regardless of location, while weight **varies** with the strength of the gravitational field. - The relationship between mass and weight is given by the formula \( W = m \cdot g \).