Kinetic Energy And The Work - Energy Theorem: The work-energy theorem

The video tutorial introduces the work-energy theorem, explaining that the net work done on a system equals the change in kinetic energy. The instructor describes the theorem in both verbal and equation forms, using a box as an example to illustrate how work affects kinetic energy. The tutorial concludes by reiterating that every joule of work done on a system results in a change in kinetic energy, emphasizing the practical application of the theorem.

What is the primary concept behind the work-energy theorem?

• The net work done on a system is equal to the change in its potential energy.

• The net work done on a system is equal to the change in its kinetic energy.

• The net work done on a system is equal to the change in its thermal energy.

• The net work done on a system is equal to the change in its gravitational energy.

In the equation form of the work-energy theorem, what does the term 'delta' represent?

• The sum of kinetic energies.

• The product of initial and final kinetic energies.

• The change in kinetic energy.

• The average of initial and final kinetic energies.

How is the initial kinetic energy represented in the work-energy theorem equation?

• One half mvf squared

• One half mvi squared

• One half mvi cubed

• One half mvf cubed

What happens to the kinetic energy of a stationary box when work is done on it?

• It remains the same.

• It decreases.

• It becomes zero.

• It increases.

In the practical example discussed, what was the initial kinetic energy of the box?

• It was greater than the final kinetic energy.

• It was zero.

• It was equal to the final kinetic energy.

• It was less than the final kinetic energy.