24) In this question, we are told that the block is pulled over a rough surface by a constant tension force. Now, we want to validate the statements in the answer choices. However, the object is traveling at a constant velocity, which means there is no acceleration. Let’s start with a free-body diagram of all the forces.
Remember, since the object is pulled across a rough surface, friction is at work. The tension and the friction are pulling in opposite directions along the x-axis, so we can subtract them to find our net force.
Looking back at the problem, it is crucial to note that the problem mentions the block moves with a constant velocity. This means the net acceleration produces by the sum of the forces is 0.
Now we have proven that the tension force and friction force are equal in magnitude but point in different directions (demonstrated in our free-body diagram of forces) Our answer must be choice C, which explains just this.
Answer: C
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