Reading of the Weighing Machine in Different Cases

Case 1: No Object on the Weighing Machine
When there is no object placed on the weighing machine, the reading will be zero. This is because the weighing machine measures the force exerted by the object due to gravity. Without any object, there is no force acting on the weighing machine, resulting in a zero reading.

Case 2: Object at Rest on the Weighing Machine
When an object is placed at rest on the weighing machine, the reading will be equal to the weight of the object. The weighing machine measures the force exerted by the object, which is directly proportional to its mass. This force is commonly referred to as the weight of the object. Hence, the reading on the weighing machine will be equal to the weight of the object.

Case 3: Object in Motion on the Weighing Machine
When an object is in motion on the weighing machine, the reading will fluctuate depending on the type of motion. If the object is in uniform motion, the reading will remain constant and equal to the weight of the object, as explained in Case 2. However, if the object is accelerating or decelerating, the reading will change accordingly. This is because the force exerted by the object will vary due to the changes in its motion.

Case 4: Multiple Objects on the Weighing Machine
If multiple objects are placed on the weighing machine simultaneously, the reading will be the sum of the weights of all the objects. The weighing machine measures the total force exerted by all the objects combined, giving the overall weight. For example, if two objects with weights of 5 kg and 3 kg are placed on the weighing machine, the reading will be 8 kg (5 kg + 3 kg).

Case 5: Weighing Machine Calibration
It is essential to regularly calibrate the weighing machine to ensure accurate readings. Calibration involves comparing the measurements of the weighing machine with a known standard weight. If any discrepancies are found, adjustments can be made to bring the readings back to accuracy.

Conclusion
The reading of the weighing machine depends on the presence of an object, its motion, and the number of objects placed on it. Understanding these cases helps in accurately interpreting the readings obtained from a weighing machine. Regular calibration is also crucial to maintain the accuracy of the weighing machine's measurements.