B I U S Activity 3: Lab Question In the friction lab, we had a group that varied the surface texture of a block and measured the force of friction by pulling the block along at a constant speed with a force sensor. a) The force sensor measures the force that the person uses to pull the block Why is that equal to the force of friction? Draw a force diagram of the block and use Newton's second law to show the force of friction equals the force of the pull. b) Sketch a graph of the force of friction versus the surface texture. What should it have looked like? c) Describe why that should happen based on what you know about the forc of friction. Drahlame University Dear