What best describes the energy in a closed system at the beginning of a day and the energy at the end of the same day? Check all that apply. Some energy can disappear after it has caused motion. Some energy can be changed from one form to another. Some energy can be lost to the environment around the system. The total initial energy will be equal to the total final energy. The total initial energy will be greater than the total final energy. Friction can cause energy to be destroyed during the day. Friction can cause the amount of thermal energy to increase?

In a closed system, the following statements are true:

- Some energy can be changed from one form to another. - The total initial energy will be equal to the total final energy. - Friction can cause the amount of thermal energy to increase.

These statements are consistent with the law of conservation of energy, which states that energy cannot be created or destroyed in an isolated system. Energy can change forms, such as from kinetic energy to thermal energy due to friction, but the total energy remains constant.

The following statements are not true:

- Some energy can disappear after it has caused motion. - Some energy can be lost to the environment around the system (assuming the system is truly closed, meaning no exchange with the environment). - The total initial energy will be greater than the total final energy. - Friction can cause energy to be destroyed during the day.

Energy doesn't disappear or get destroyed; it only transforms from one type to another. In physics, the concept of energy conservation is crucial. It tells us that in a closed system, the amount of energy remains constant over time. While energy can take various forms like kinetic energy (movement), potential energy (due to position), thermal energy (heat), and others, the total energy value does not change unless energy is added or removed from the system—but in a closed system, there is no exchange with the outside.

When we consider friction or other non-conservative forces, they do not destroy energy. Instead, they convert kinetic energy (energy of motion) into thermal energy (heat energy). For example, when you rub your hands together, the kinetic energy of your hands' movement due to the force of friction is transformed into heat, and your hands warm up.

It's worth noting that even though in a closed system the energy remains the same, the form of energy that's most useful to us can decrease. This is described by the concept of entropy, which tends to increase in a system, leading to a decrease in the system's ability to perform work, which is known as the second law of thermodynamics. However, the total energy, accounting for all forms, remains fixed.