Basic Definition – Matter Contained in a Body In classical mechanics, the term for the amount of matter contained in a body is:

Introduction / Context:
Precise terminology avoids confusion when solving engineering problems. “Mass,” “weight,” and “momentum” are often mixed up by beginners, but they represent different physical quantities.

Given Data / Assumptions:

• Standard SI units are used: mass in kilograms (kg), force in newtons (N).
• Near Earth’s surface g ≈ 9.81 m/s^2 for weight computations.

Concept / Approach:
Mass is a scalar measure of the amount of matter and the inertia of a body. Weight is the gravitational force acting on that mass. Momentum is mass multiplied by velocity and characterizes motion. An impulsive force is a large force applied over a short interval causing a finite change in momentum.

Step-by-Step Solution:
Define mass: amount of matter; intrinsic; unit kg. Relate weight: W = m * g (a force; units N). Relate momentum: p = m * v (units N·s). Therefore, the correct term for “matter contained” is mass.

Verification / Alternative check:
A body taken to the Moon retains the same mass but has reduced weight due to lower lunar gravity. This confirms that mass measures matter content, not gravitational pull.

Why Other Options Are Wrong:
weight: depends on g; not an amount of matter. momentum: requires motion; not a property of matter content. impulsive force: not a property; a type of force application. density: mass per unit volume; not the amount itself.

Common Pitfalls:
Saying “my weight is 70 kg” instead of “my mass is 70 kg”.

Final Answer:
mass