A 60-lb block rests on a rough horizontal surface. The horizontal force that just starts the block moving is found to be 30 lb. Which of the following is true for this situation?
mu static = .5
In this situation, there are two main forces acting on the block: the force applied horizontally and the force of friction. The force applied horizontally represents the force that will start the block moving, while the force of friction opposes the motion of the block.
To determine which statement is true in this scenario, we need to consider the relationship between the applied force and the force of friction. There are generally two possibilities:
1. If the applied force is equal to the force of friction, the block will just start moving. In this case, the applied force of 30 lb is equal to the force of friction between the block and the rough surface.
2. If the applied force is greater than the force of friction, the block will start moving. In this case, the applied force of 30 lb is greater than the force of friction, indicating that the block will overcome the frictional force and begin to move.
Based on this information, the correct statement in this situation is that the applied force of 30 lb is equal to the force of friction.