AP Physics Essentials: Total Energy

Mr. Andersen explains the concept of total energy in a system, covering kinetic, potential, and internal energy. He demonstrates energy conversion and the impact of friction, using examples like a baseball pitch to illustrate calculations of kinetic and potential energy. The video also touches on advanced topics like rotational and elastic potential energy, emphasizing the ability to predict energy changes over time.

What types of energy are present in a system with a moving sphere attached to a spring?

• Only elastic potential energy

• Kinetic, gravitational potential, and elastic potential energy

• Kinetic and gravitational potential energy

• Only kinetic energy

What happens to the total energy of a system when friction is present?

• It doubles

• It increases over time

• It remains constant but is converted to other forms

• It decreases to zero

What is internal energy in the context of a system's total energy?

• Energy due to gravitational position

• Energy due to the system's velocity

• Energy of the particles within an object

• Energy stored in a spring

How is work related to energy in a physical system?

• Work is the energy of particles within an object

• Work is the energy lost due to friction

• Work is the energy stored in a spring

• Work is a force applied over a distance

What two values are needed to calculate the kinetic energy of a baseball?

• Mass and height

• Velocity and gravitational field strength

• Mass and velocity

• Spring constant and displacement

If the mass of an object is doubled, what happens to its kinetic energy?

• It remains the same

• It quadruples

• It doubles

• It triples

What formula is used to calculate gravitational potential energy?

• 1/2 Iω^2

• kx^2

• 1/2 mv^2

• mgh

What is the spring constant in the formula for elastic potential energy?

• The gravitational field strength

• The mass of the object

• The stiffness of the spring

• The velocity of the object

How does friction affect the energy in a system over time?

• It converts energy into other forms, reducing usable energy

• It has no effect on energy

• It doubles the energy

• It increases the total energy

What happens to the energy in a system with no friction?

• It decreases to zero

• It remains constant and keeps moving

• It doubles over time

• It is lost to the surroundings