18. What force is responsible for making the skater stop? 19.Calculate the gravi

Question

18. What force is responsible for making the skater stop?

19.Calculate the gravitational potential energy of the skater at the top of the track

20. Using the conservation of energy theorem calculate the speed of the skater at the bottom of the track, just before starting to move along the flat surface.

21.What is the distance traveled by the skater along the flat surface? Use the “Measuring Tape” to determine it. Select the answer closest to your measurement. Make sure that you click "Clear Heat" before every run

22. Calculate the net work done by all forces acting on the skater when moving along the horizontal surface using the work kinetic energy theorem.

Any help will be very much appreciated! :)

Energy Skate Park (2.13) File Tracks Help Reset Return Skater Tracks Choose Skater.. Measunng Tape Poenal Energy Reference - Grid Path Show Path Energy Graphs Show Pie Chart Clear wth Thermal | Bar Graph Energy va Position Energy vs. Time PE 0 at this dotted line Locaton Space OMoon Earth Jupite Gravity91Ng 0 meters Help! slow fast

Explanation / Answer

a)after the skater reaches the bottom the frictional forces cause the skater to stop.

b)PE = mgh

c) To find velocity use mgh =0.5*m*v^2........

v= (2gh)^0.5=(2*9.81*4)^0.5 = 8.858m/s

d)let the friction coeffiecient be u, then the Kinetic enrgy gained by skater equals work by friction

then mgh=umgx

x = h/u

e)Work done = KEf - KEi = 0-0.5mv^2=-0.5mv^2=-mgh

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