Energy Conservation and Transfer

What happens to energy when it is transferred from a hotter object to a cooler object?

What is an example of energy dissipating in a tumble dryer?

How is energy typically dissipated into the surroundings?

Which of the following statements about energy is true?

What is meant by energy being 'dissipated'?

Which of the following statements accurately reflects the Law of Conservation of Energy?

How does the height of an object affect its gravitational potential energy?

What happens when a ball falls to the ground regarding its energy stores?

Which type of energy store is exemplified by batteries and fuels?

What does a stretched or squashed object possess in terms of energy?

How is energy transferred when a person lifts a book onto a high shelf?

How does temperature affect an object's thermal energy storage?

When considering energy transfer via radiation, which phenomenon is involved?

Energy Conservation

Energy cannot be created or destroyed; it's conserved.
Energy can be stored and transferred between different energy stores.
Energy is measured in joules (J). A kilojoule (kJ) is 1000 joules.

Energy Stores

Kinetic Energy Store: Amount depends on object's speed. Higher speed = more kinetic energy.
Gravitational Potential Energy Store: Amount depends on the height of the object. Higher height = more gravitational potential energy.
Thermal Energy Store: Amount depends on the temperature. Higher temperature = more thermal energy.
Chemical Energy Store: Found in batteries, foods, and fuels. Energy is transferred via chemical reactions.
Elastic Potential Energy Store: Found in stretched or squashed objects.

Energy Transfer

Mechanical Working: Energy transferred when a force moves an object.
Radiation: Energy transferred as waves (light, sound).
Heating: Energy transfer from a hotter object to a cooler object.
Energy Transfer within a System: Energy can be dissipated.

Dissipation of Energy

Energy is lost to the surroundings, usually through heating, but also radiation (e.g., sound).
Dissipation depends on the system. Example: A tumble dryer transfers electrical work into thermal and kinetic energy for drying clothes, but also dissipates energy through sound and heating.
Dissipated energy is stored in less useful ways in the surrounding environment.

The Law of Conservation of Energy

French philosopher Émilie du Châtelet's experiment demonstrated that energy is conserved when objects fall.
Her findings support the Law of Conservation of Energy.

This quiz covers the fundamental principles of energy conservation, various energy stores, and the methods of energy transfer. Understand how kinetic, potential, and thermal energy function, along with concepts related to mechanical work and radiation.