22) For this question, we need to use process of elimination to find the statement that is true above the situation represented above. Let's start with a free body diagram to help us understand the given situation.
To make it simpler for us to solve the problem, we can break the applied force(F) into its x and y-components.
Choice A & B: Both weight(W) and normal force(N) act in the vertical plane. To help us, we should look at the sum of the vertical forces.
The weight is equal to the sum of the normal force and the applied force, this tells us that the weight is greater than the normal force, thus eliminating choice A and B.
Choice C & D & E: Both the applied force and the frictional force have components that act in the horizontal plane. We can look at the sum of the horizontal forces to help us qualify the answer choices.
This tries to trick you. The frictional force is not equal to the applied force. Rather, the frictional force is equal to the x-component of the applied force, which means the magnitude of the applied force must be greater than the frictional force. This means the answer will be D, which says the frictional force is lower in magnitude than the applied force.
Answer: D
Comments