Question
1. A 10-kg object is dropped from rest. After falling a distance of 50 m, it has a speed of 26 m/s.
a. Write the expression for the change in mechanical energy caused by the dissipative (air) resistive force on the object during this descent.
b. Calculate the energy.
a. Write the expression for the change in mechanical energy caused by the dissipative (air) resistive force on the object during this descent.
b. Calculate the energy.
Answers
a = drop in potential energy = m g h
b = gain in kinetic energy = (1/2) m v^2
work done by friction = a - b
b = gain in kinetic energy = (1/2) m v^2
work done by friction = a - b
-1.5kj
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