An object is weighed at different locations on the Earth. What will be the right observation?

Step 1: Analyze the question The question asks what happens to an object's mass and weight when it is weighed at different places on Earth.

Step 2: Concept

• Mass is the amount of matter in a body. It is measured in kilograms (kg) and does not change with location.
• Weight is the force of gravity on the body: W = mg. It is measured in newtons (N).
• The value of g is not exactly the same everywhere on Earth. It is about 9.83 m/s² at the poles and about 9.78 m/s² at the equator. It also decreases with altitude, for example on a mountain top compared with sea level.

Step 3: Solution Since W = mg and m is fixed, any change in g changes W.

• Mass stays constant, because the amount of matter does not change.
• Weight varies slightly, because g varies from place to place (latitude, altitude).

Checking the options:

• A: Wrong, because mass does not vary.
• B: Wrong, because it reverses the facts.
• C: Correct. Mass is constant and weight varies.
• D: Wrong, because weight depends on g, which changes with location.

Step 4: Answer

Tip: Remember "Mass is Matter, it stays the same; Weight depends on gravity, so it changes." If a question mentions different locations (equator, poles, mountain, Moon), expect mass to be constant and weight to vary.