Final answer:
A 2-kg rock has twice the mass of a 1-kg rock because mass measures the amount of matter in an object, and thus a rock with 2 kg of mass contains twice the matter as a rock with 1 kg of mass.
Step-by-step explanation:
Yes, a 2-kg rock does indeed have twice the mass of a 1-kg rock. The concept of mass is straightforward: it is a measure of how much matter an object contains. So, if you have one rock that is 2 kg and another rock that is 1 kg, the first rock has twice the amount of matter compared to the second. Mass is an intrinsic property of an object and does not change regardless of location or velocity.
Let's clarify some of the potential confusion from the extra information provided:
- Momentum is a separate concept that depends on both mass and velocity. However, it is unrelated to how we compare the mass of two objects.
- The mass of an object is not affected by its weight, which is force due to gravity (weight = mass × gravitational acceleration). On the moon, for instance, the object's mass stays the same while its weight decreases due to the lower gravitational pull.
- Height above the ground affects the potential energy of an object, not its mass. Similarly, increasing velocity impacts kinetic energy, again not mass.