7. Exercises VII

1. The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?

 

The law of conservation of energy is violatedisn’t violated

 

This is because when the body falls from a height, then its kinetic energypotential energy changes into potential energykinetic energy progressively. A decrease in the potential energyincrease in the kinetic energyincrease in the potential energydecrease in the kinetic energy is equal to an decrease in the potential energydecrease in the kinetic energyincrease in the kinetic energyincrease in the potential energy of the body. Throughout the process, the total mechanical energy of the body remains conservednot conserved.

 

2. What are the various energy transformations that occur when you are riding a bicycle?

 

Energy transformations that occur when you are riding a bicycle - Muscular energy → Kinetic energyMuscular energy → Heat energyMuscular energy → Kinetic energy + Heat energy.