These are questions related to causes of friction!
Help is appreciated ^.^


If we repeat the slide of the plastic but wet the table first, what will happen? More friction or less?

If we spray a little oil on the wet table and repeat the sliding experiment, what will happen?

What would happen if you tried to slide a rubber eraser across the table? Why?

1 more
2 less friction. Easily sliding
3 lots of friction. It will not slide easily

Answer: fn = wcos50 = 38.89(9.81)(cos50) = 245.23 n

Answerthe energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.explanationwe define electric potential as the ratio electric potential energy to the charge,    then the following gives us the potential difference,      the formula  may be on your formula sheet.the change in electric potential energy would be the energy that would needed to move it from point a to point b. solving for that, we get    using q = 8.00  × 10⁻¹⁹ c and  δv = 2.00 v, we get    the energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.