The direction of the frictional forces is something you need to think about carefully. The best rule of thumb is the following: the direction of the frictional force is such that it tries to keep the two surfaces from slipping. In each of these situations, what would be the direction of the frictional force? In cases of the inclines, consider left to be down and to the left (parallel to the incline) and right to be up and to the right (parallel to the incline). A book is being pressed against the wall as shown to keep it from falling. The book. stationary. F Consider the frictional force between the book and the wall. A coffee mug is resting on the top of a car. The car is moving to the right and accelerating to the right. Consider the frictional force of the roof of the car on the coffee mug. block is placed on an incline as shown and the block doesn't move. Consider the frictional force between the block and the incline. Presume the surface of the incline to be more horizontal that vertical. A coffee mug is sliding to the right across a tabletop A block is being pushed to the right along an incline as shown. Consider the frictional force between the block and the incline. Submit Answer Tries 0/10

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Rotational Equilibrium And Rotational Dynamics

In physics, the state of balance between the forces and the dynamics of motion is called the equilibrium state. The balance between various forces acting on a system in a rotational motion is called rotational equilibrium or rotational dynamics. 

Equilibrium of Forces

The tension created on one body during push or pull is known as force.