Question

The pendulum in a clock gradually slows down and stops moving after a while. A student states that its loss of mechanical energy is evidence that energy is not always conserved.

Which two statements offer evidence that the clocks energy is conserved?

. Conservation of energy happens only when the parts of the clock are oiled to reduce friction.
. The pendulum stops moving because all of its mechanical energy has been transformed into thermal energy and sound energy.
. Conservation of energy occurs because the clocks matter is also conserved.
. Friction between its moving parts transformes some of the pendulums energy into other forms of energy.

Answer 1

OPTION B AND D.

Energy conservation dictates energy cannot be destroyed, merely transformed. The pendulum in the clock stops due to mechanical energy transforming into thermal and sound energy, and friction transforming energy into different forms, demonstrating conservation of energy despite the pendulum's halt.

Step-by-step explanation:

The conservation of energy principle states that energy cannot be created or destroyed, only transformed. In the case of the pendulum clock, two statements support the conservation of energy despite the pendulum eventually stopping:

• The pendulum stops moving because all of its mechanical energy has been transformed into thermal energy and sound energy.
• Friction between its moving parts transforms some of the pendulum's energy into other forms of energy.

These statements show that the pendulum's energy is converted into other forms due to the effects of non-conservative forces like friction. In a closed system without non-conservative forces, such as friction or air resistance, the sum of kinetic and potential energy would remain constant throughout the pendulum's swings.

Answer 2

. Friction between its moving parts transformes some of the pendulums energy into other forms of energy.

. Conservation of energy happens only when the parts of the clock are oiled to reduce friction.

Step-by-step explanation:

I remember me doing this last year I tried my best thank you <33