2 when the mass on the block is was doubled what

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2. When the mass on the block is was doubled, what happens to the angle of repose? Were your results as expected. Explain.
3. Why was it necessary to tap the block to get it started in section 11 of the lab?
4. Why can anti-lock brakes stop a car in a shorter distance than regular brakes?
5. Which method do you think would yield the more accurate value for the coefficient of kinetic friction and why?

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