Ravi pushed a 500g block across a wooden floor. He then applied some wax to the floor and pushed the same block again. What was the effect of applying wax on the frictional force?
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Worked Solution
Step 1: Wax acts as a lubricant.
Step [2-9]: Lubricants smooth out surface irregularities between the block and the floor.
Step [2-9]: This reduction in surface roughness results in a decrease in frictional force.
Correct answer: The frictional force decreased.
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