You've reached the end of the experiment activities, and you are feeling good. You're also curious - now that you've measured the coefficient of static friction, can you measure the coefficient of kinetic friction? Assume you've used a wooden block, a pulley and string, and a set of hanging masses, just as described in the Experiment 2 activity. It seems like you could almost measure up with the materials you've got, but something else is needed. Which of the following would be necessary to measure the coefficient of kinetic friction? O You'll need to be able to measure the force with which you push the block to get it moving. O You'll need to tilt the table (or set up a ramp) to make sure the block stays moving once it starts. O You'll need to be able to measure the acceleration of the moving block. O You'll actually need to do all of the above to do this. You actually don't need anything else, no additional materials or changes to the set-up are needed