PARTS C AND D ARE WHAT I'M HAVING TROUBLE WITH.
a tobaggan of mass 20kg is dragged horizontally across snow by someone who exerts a force of 45N. the tobaggan travels 8m under the action of the force and has a final speed of 2.6 m/s.
a)calculate the actual kinetic energy of the tobaggan based on its speed
Ek=1/2mv^2
=1/2(20)(2.6)
=67.6J
b)Calculate the amount of work actually done on the tobaggan by the applied force
W=F X d
=450X8
=3600J
c)From your answers to parts a and b, calculate the amount of thermal energy generated.
Ethermal=Ekinetic + Epotential
I know that kinetic =67.6J from part a, but what would potential be?
d)Explain how this thermal energy was generated and state one effect it might have. ????? no idea of this one.
c. The equation is nuts. It should read:
work done=changeinKE+changeinPE+changeinThermal
you have the change in KE, the change in PE is zero, you know work done, so you calculate the changeinThermal.
As a side note, b is wrong, F=45, not 450N