State the principle of conservation of energy .

Energy cannot be created or destroyed ; it can only be transformed from one form to another.

What does an energy bar chart show?

The relative amounts of the different types of energy in a system at a specific instant in time.

Why does a car driving up a hill have no gravitational potential energy when the car alone is the system?

The Earth is not included in the system, so the car cannot have gravitational potential energy. A system of a single object can only have kinetic energy .

When is the total mechanical energy of a system constant?

The work done on the system is zero There are no nonconservative interactions within the system

Work done by nonconservative forces means energy is .......... to the surroundings.

Work done by nonconservative forces means energy is dissipated to the surroundings.

True or False? Energy is not conserved when friction acts on a system.

False. Energy is always conserved . Friction transfers energy out of the system, so the total energy is not constant within the system .

AP®PhysicsCollege BoardPhysics 1: Algebra-BasedFlashcardsUnit 3: Work, Energy & PowerConservation of Energy

Conservation of Energy (College Board AP® Physics 1: Algebra-Based): Flashcards

1/8

0Still learning

Know0

FrontConservation of Energy
State the principle of conservation of energy.

Was this flashcard helpful?

Cards in this collection (8)

State the principle of conservation of energy.
Energy cannot be created or destroyed; it can only be transformed from one form to another.
Define mechanical energy.
Mechanical energy is the sum of a system's kinetic and potential energies.
$E_{mech} = U + K$
What does an energy bar chart show?
The relative amounts of the different types of energy in a system at a specific instant in time.
Why does a car driving up a hill have no gravitational potential energy when the car alone is the system?
The Earth is not included in the system, so the car cannot have gravitational potential energy.
A system of a single object can only have kinetic energy.
When is the total mechanical energy of a system constant?
- The work done on the system is zero
- There are no nonconservative interactions within the system
Work done by nonconservative forces means energy is .......... to the surroundings.
Work done by nonconservative forces means energy is dissipated to the surroundings.
State the equation for conservation of energy when nonconservative forces act on a system.
$U_{i} + K_{i} + W_{n c f} = U_{f} + K_{f}$
- $U_{i}, U_{f}$ = initial and final potential energy (J)
- $K_{i}, K_{f}$ = initial and final kinetic energy (J)
- $W_{n c f}$ = work done by nonconservative forces (J)
True or False?
Energy is not conserved when friction acts on a system.
False.
Energy is always conserved. Friction transfers energy out of the system, so the total energy is not constant within the system.

Sign up to unlock flashcards

By signing up you agree to our Terms and Privacy Policy

Previous:Work-Energy TheoremNext:Power