Force vs Weight: Understanding the Difference

Weight is a specific force — gravity acting on mass. Not all forces are weight. A book on a table experiences weight downward and normal force upward.

Step-by-step

1. Weight formula: W = mg (force of gravity on an object).
2. On Earth, g ≈ 9.8 m/s²; on the Moon, g ≈ 1.6 m/s².
3. Weight changes with location; mass does not.
4. Normal force, friction, tension, and applied forces are separate from weight.
5. In free fall, weight is the only force (ignoring air resistance) — apparent weightlessness.
6. Calculate both force and weight with our Force Calculator and Weight Calculator.

Open the Force Calculator to apply these steps with your own numbers instantly.

Frequently asked questions