Introduction to Conservation of Mechanical Energy

What is potential energy?

• Energy stored as a result of the position of the object

• Energy of motion

What is kinetic energy?

• energy of motion

• (1/2)mv

• stored energy

• energy when an object is on the ground

• when an object has zero PE

What important steps were followed here, just as when you learned to calculate work and energy in our class when given a problem?

Evaluate responses using AI:

OFF

What happens as the object gets closer to the ground?

• it slows down

• It gains speed or motion

The total distance that the mass falls is 2.0 meters.  Study the data table:  What do you notice about the PE and KE when the mass has fallen halfway down?

Evaluate responses using AI:

OFF

What is true about the KE and the PE when the blue and the red lines intersect (cross)?

• The object stops moving

• The KE is equal to the amount of PE

• The total mechanical energy is lowest at this time

• All energy is lost

What is total mechanical energy?

• the potential energy plus the kinetic energy

• the potential energy minus the kinetic energy

Friction causes a loss of mechanical energy. The "lost" energy is changed into thermal energy (heat energy).

• True

• False

When is the Potential Energy at its maximum amount?

• at either end of the pendulum's swing

• at the bottom of the swing

When is the Kinetic Energy at its maximum amount?

• At either end of the pendulum's swing

• At the bottom of the swing