The conveyor belt question usually involves three questions, namely the time when the object passes through the conveyor belt, the trace left by the object on the conveyor belt, and the friction force of the object on the conveyor belt. Below is an analysis of the frictional force of an object on a conveyor belt.

1. Selection of reference objects for objects on conveyor belts
The friction force of objects on the conveyor belt should be based on the conveyor belt in contact with the object, not on the ground or objects that stop relative to the ground.

2. The method of determining the direction of frictional force on an object on a conveyor belt
The key to determining the direction of friction of an object on a conveyor belt is to distinguish whether the object is sliding relative to the conveyor belt or has a relative motion trend. If it is relative motion, the direction of the sliding friction force experienced by the object is opposite to the direction in which the object slides relative to the conveyor belt; If there is a relative motion trend, the assumption method is usually used to first determine the direction of the object's motion trend relative to the conveyor belt, and finally determine the direction of the object's static friction force based on the opposite direction of the static friction force and the relative motion trend direction.
The method for determining the relative motion trend of an object on a conveyor belt is to assume that the contact surface between the object and the conveyor belt suddenly becomes lubricated. Under this condition, the analysis begins. If the speed of the object and the conveyor belt is still the same, it is explained that there is no relative motion trend between the object and the conveyor belt; If the speed of the object is different from that of the conveyor belt, and the direction of the object's relative speed to the conveyor belt is further analyzed, then that direction is the direction of the object's relative motion trend to the conveyor belt.

3. The magnitude of frictional force on an object on a conveyor belt
Calculate the sliding friction between the object and the conveyor belt. On a horizontal conveyor belt, FN is equal to the size of the object's gravity; On a skewed conveyor belt, FN is equal to the force of the object's gravity along the direction perpendicular to the conveyor belt.
There is no ready-made formula for calculating the static friction force of objects on a conveyor belt, and it is usually determined based on common sense of balance or Newton's second law.

Article compilation: Jiangmen assembly line www.zs-chsb.com