QUESTION 1 Where on the track should the zero of the gravitational potential ene

Question

QUESTION 1 Where on the track should the zero of the gravitational potential energy be taken? 20 cm 30 cm 60 cm 80 cm 90 cm 100 cm QUESTION 2 For procedure 3, let PE be the potential energy of the compressed spring and KE and PEg be the kinetic and gravitational potential energy near the highest postion of the cart Which is the relationship is corect? C PEG KE-PE C PEC-KE + PEs PE,KE-PE QUESTION 3 Suppose there is friction on the cart in procedure 1, as the cart is traveling down the incline. What is expected for the mechanical energy of the cart? 0 The energy at the top should be less than the energy at the bottom The energy at the top should be equal to the energy at the botom. The energy at the top should be greater than the energy at the bottom It depends on the choice of the zero for the potential onergy

Explanation / Answer

1) 0cm

PE should be taken zero at the lowest point i.e. zero of a coordinate system.

2) PEs =KE + PEg

Initial energy = PEs

Final energy = KE +PEg

Thus by energy conservation, initial energy = final energy.

3) Energy at the top should be greater than the energy at the bottom.

Starting at the top there is total energy. While coming down some energy is lost due to friction.

Thus energy is lowered at the bottom.

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