Kinetic Energy and Elastic Potential

This section focuses on calculating kinetic energy and understanding elastic potential energy, essential concepts in physics energy revision notes.

Definition: Kinetic energy (Ek) is calculated using the formula: Ek = ½ × mass × velocity²

Example: A detailed calculation shows how to find the kinetic energy of a 400kg car moving at 10m/s, resulting in 20kJ of energy.

Highlight: The relationship between mass, velocity, and kinetic energy demonstrates that doubling the velocity quadruples the kinetic energy.

Work Done and Energy Transfer

This page explains the concept of work done and its relationship to energy transfer by heating.

Definition: Work done is the measure of energy transfer when a force moves an object.

Example: A problem-solving example shows how to calculate the force needed when 12,000J of work is done over 80m.

Highlight: Work done can be mechanical (involving force and movement) or electrical (involving current transfer).

Page 1: Energy Stores and Transfers

This page introduces fundamental concepts of energy stores and transfer pathways in physics. It comprehensively explains different types of energy stores and how energy can be transferred between them through various pathways.

Definition: Energy stores are locations where energy can be contained within objects or systems, while energy transfers describe how energy moves between these stores.

Example: A torch demonstrates multiple energy transfers: chemical energy from the battery converts to electrical energy, which then becomes light and thermal energy.

Vocabulary: Dissipation refers to energy that is transferred to the surroundings in ways that are not useful for the intended purpose.

Highlight: The conservation of energy principle states that energy cannot be created or destroyed, only transferred between stores or dissipated.