Introduction to Conservation of Mechanical Energy with Demonstrations

The video tutorial explores three types of energy: kinetic, gravitational potential, and elastic potential. Mr. Terry demonstrates an experiment by dropping a mass to illustrate energy concepts. The tutorial covers calculations of kinetic and gravitational potential energy, graphing energy changes, and the conservation of mechanical energy. It explains conditions under which mechanical energy is conserved, using examples like a pendulum to demonstrate energy transformation.

Which of the following is NOT classified as mechanical energy?

• Thermal energy

• Elastic potential energy

• Gravitational potential energy

• Kinetic energy

What is the initial kinetic energy of a mass at rest before it is dropped?

• 10 Joules

• 30 Joules

• 20 Joules

• 0 Joules

How is gravitational potential energy calculated?

• Half of mass times velocity squared

• Mass times height

• Mass times acceleration due to gravity times height

• Mass times velocity squared

What happens to the kinetic energy of an object as it falls?

• It becomes zero

• It remains constant

• It decreases

• It increases

What is the total mechanical energy of the object throughout its fall?

• It decreases

• It increases

• It becomes zero

• It remains constant

Under what condition is mechanical energy conserved?

• When energy is added to the system

• When energy is converted to sound

• When no energy is added or removed from the system

• When energy is converted to heat

In the absence of which force is mechanical energy conserved during projectile motion?

• Nuclear force

• Frictional force

• Gravitational force

• Magnetic force