Explanations & Calculations
- By considering the conservation of mechanical energy of the child from the top of the rod to the bottom of it and taking the average frictional force to be f, the average frictional force could be calculated.
Ep+Ekmgh+0f=Ep1+Ek1+Eexternal−work=0+21mv2+fs=smgh−0.5mv2=3m30kg.10ms−2.3m−0.5.30kg.(2ms−1)2=280N
- To understand in simple terms, the energy she had at the top is expended to give that speed at the bottom (in terms of kinetic energy) & to overcome the friction imposed on her by the pole.
Comments
Leave a comment