Phys-Presentation 4.3 Conservation of Energy

Front

What is the Expanded Work-Energy Theorem?

Back

The Expanded Work-Energy Theorem states that the initial kinetic energy plus initial gravitational potential energy plus the initial elastic potential energy of a system, plus the work done on the system, equals the final kinetic energy and potential energies of the system.

Front

What does E_i represent in the equation E_i + W = E_f?

Back

E_i represents Initial energy.

Front

What principle explains the energy transformation in a rocket launch?

Back

The principle that explains the energy transformation in a rocket launch is the Conservation of Energy.

Front

What does the law of conservation of energy state?

Back

The law of conservation of energy states that energy is neither created nor destroyed.

Front

How can energy be transferred between systems?

Back

Energy can be transferred between systems through work or heat.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of an object due to its motion, calculated as KE = 1/2 mv^2, where m is mass and v is velocity.

Front

What is potential energy?

Back

Potential energy is the stored energy of an object due to its position or state, such as gravitational potential energy, which is calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What is the relationship between work and energy?

Back

Work is done when energy is transferred to or from an object, resulting in a change in energy.

Front

What is the principle of conservation of mechanical energy?

Back

The principle of conservation of mechanical energy states that in the absence of non-conservative forces (like friction), the total mechanical energy (kinetic + potential) of a system remains constant.

Front

What is an example of energy transformation?

Back

An example of energy transformation is a roller coaster, where potential energy at the top of a hill is converted to kinetic energy as it descends.