A weighing machine measures

Options

A. weight only
B. mass only
C. mass and weight
D. none of these

Answer

### Step-by-Step Solution:

1. **Understanding the Weighing Machine**: A weighing machine is an instrument used to measure the weight of an object. Weight is the force exerted by gravity on an object.

2. **Weight vs. Mass**: It's important to differentiate between weight and mass. Mass is a measure of the amount of matter in an object and is usually measured in kilograms (kg). Weight, on the other hand, is the force acting on that mass due to gravity and is measured in newtons (N).

3. **The Role of Gravity**: The weight of an object is calculated using the formula:
\[ \text{Weight} (W) = \text{Mass} (m) \times \text{Acceleration due to gravity} (g) \]
where \( g \) is approximately \( 9.8 \, \text{m/s}^2 \) on the surface of the Earth.

4. **How the Weighing Machine Works**: When a person stands on a weighing machine, the machine measures the force exerted by the person due to gravity. This force is the person's weight, which the machine displays.

5. **Conclusion**: Therefore, the weighing machine measures the weight of an object, which is the gravitational force acting on it.