The diagram shows a simple pendulum.Neglecting friction, what happens to the total mechanical energy as the pendulum swings from position A to position B? aIt remains the same. bIt is not conserved. cIt decreases. dIt increases.
The correct answer is a) It remains the same.
In an ideal system neglecting friction, the total mechanical energy of a pendulum is conserved. The pendulum swings from position A to position B under the influence of gravity, and as it swings upward, its potential energy increases while its kinetic energy decreases. However, the sum of the potential and kinetic energies remains constant, resulting in the total mechanical energy remaining the same.
A student walks downstairs to class. Which statement correctly describes the types of energy the student has at the top of the stairs and as she walks down the stairs? apotential energy at the top of the stairs; kinetic energy as she walks down bpotential energy at the top of the stairs; potential energy as she walks down ckinetic energy at the top of the stairs; potential energy as she walks down dkinetic energy at the top of the stairs; kinetic energy as she walks down
The correct answer is a) potential energy at the top of the stairs; kinetic energy as she walks down.
At the top of the stairs, the student has potential energy due to her position above the ground. As she walks down the stairs, this potential energy is converted into kinetic energy, which is the energy of motion. Therefore, at the top of the stairs, the student has potential energy, and as she walks down, this is converted into kinetic energy.
The diagram shows a baseball being thrown into the air.Which graph best represents how the kinetic energy (KE) and potential energy (PE) of the baseball change through its flight? a b c d
I'm sorry, but I cannot see or interpret the diagram you mentioned. Please provide a description or more specific information about the graph options (a, b, c, d) so I can help you select the correct one.
To answer this question, we need to consider the concept of mechanical energy and how it relates to the motion of a simple pendulum.
Mechanical energy is the sum of the kinetic energy and potential energy of an object. In the case of a simple pendulum, the mechanical energy is primarily in the form of potential energy at the highest point of the swing (position A) and mostly in the form of kinetic energy at the lowest point of the swing (position B).
As the pendulum swings from position A to position B, the potential energy decreases, and the kinetic energy increases. This can be explained in terms of the conversion of energy between potential and kinetic as the pendulum oscillates back and forth.
Since the mechanical energy is the sum of the potential and kinetic energy, and the total energy is conserved in an isolated system, we can conclude that:
b) It is not conserved.
The mechanical energy of the pendulum decreases as it swings from position A to position B. This decrease in energy is attributed to the conversion of potential energy to kinetic energy, as the pendulum moves from the highest point (where potential energy is maximum) to the lowest point (where kinetic energy is maximum).