Respuesta :
As the pendulum swings back and forth, it interacts with the air in its path.
It has to push air molecules out of the way in order to get through their
space.
You can call that giving the molecules kinetic energy, but in the case of
gases, that's the same as adding heat to them.
So choices 'A' and 'B' are both good.
It has to push air molecules out of the way in order to get through their
space.
You can call that giving the molecules kinetic energy, but in the case of
gases, that's the same as adding heat to them.
So choices 'A' and 'B' are both good.
The pendulum loses height during its back and forth motion because the pendulum bob’s energy is being transformed into heat energy.
Further Explanation:
The back and forth motion of the pendulum’s bob is the periodic motion. The energy of the bob continuously changes from one form to another during its motion
The bob has maximum kinetic energy at its equilibrium position. As it moves towards the maximum height, the kinetic energy of the bob gets converted into the potential energy and this conversion of energy continues all throughout the motion of the pendulum’s bob.
Now when the pendulum moves in air, there occurs the friction between the air molecules and the pendulum. Due to the friction with the air particles, some of the energy of the bob gets lost in the form of heat.
Due to the formation of heat energy, the maximum potential energy of the bob gets decreased and due to this decrease in the potential energy, the pendulum bob’s maximum height gets reduced.
Thus, the pendulum loses height during its back and forth motion because the pendulum bob’s energy is being transformed into heat energy.
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Answer Details:
Grade: Middle School
Subject: Physics
Chapter: Conservation of Energy
Keywords: Heat energy, pendulum, bob, swings back and forth, maximum height, kinetic energy, potential energy, energy is being transformed, loses height, friction, air particles.
