if you push a book on a table so that its velocity is constant if the force you apply is 15 n what is the force due to sliding friction
What is 15N? If there is not any net force (pushing-friction), velocity is constant.
To determine the force due to sliding friction, we first need to understand the concept of static and kinetic friction.
When an object is at rest or not moving, the force of friction is called static friction. As long as the force applied to the book does not exceed the maximum static friction force, the book will not move.
However, once the force applied exceeds the maximum static friction, the object starts moving. At this point, the force of friction changes from static friction to kinetic friction. Kinetic friction is generally smaller than static friction.
Since the book is sliding on the table with a constant velocity, we can conclude that the force applied is equal to the force of kinetic friction.
Therefore, the force due to sliding friction in this case would be 15 N.
To determine the force due to sliding friction, we can use the concept of Newton's second law of motion. According to Newton's second law, the net force acting on an object is equal to the product of its mass and acceleration.
In this case, the book is moving on a table with a constant velocity, which means its acceleration is zero. Therefore, the net force acting on the book must also be zero. The net force is the vector sum of all the individual forces acting on the object.
Since a force of 15 N is being applied to push the book, there must be an opposing force due to sliding friction that cancels out this applied force in order for the net force to be zero. Thus, the force due to sliding friction is also 15 N in the opposite direction.
It's important to note that the magnitude of the force due to sliding friction is typically equal to the applied force only when the object is moving at a constant velocity and there is no acceleration.