You push a book on a table so that its velocity is constant. If the force that you apply is 15N. What is the force due to sliding friction? If you accelerate , so that the velocity is no longer constant is the force that you are applying to the book greater or smaller than the sliding force? Please answer in 100 words!
To determine the force due to sliding friction, we can refer to the equation of motion for an object with constant velocity and neglecting other forces. According to Newton's first law, if the book has a constant velocity, the net force acting on it must be zero. Therefore, the force due to sliding friction must be equal in magnitude but opposite in direction to the force you apply, which is 15N.
When the book is accelerated, its velocity is no longer constant. To understand the relationship between the force applied and the force due to sliding friction, we can refer to Newton's second law. The net force acting on an object is equal to its mass multiplied by its acceleration (F = ma). Thus, when the book is being accelerated, the force you apply to the book must be greater than the force due to sliding friction since the net force is no longer zero.