Question

As a pendulum bob swings back and forth several times, the maximum height it reaches becomes less and less.

Answer 1

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.

Answer 2

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.

Learn More:

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2. Suppose you have a 120-kg wooden crate resting on a wood floor brainly.com/question/10470406

3. An electrical shock happens when electric _______ enters the body at one point and leaves through another brainly.com/question/3059888

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.