Work Added Equation (With Kinetic Energy)
Reference from the original Physics I textbook.
- Work Added Equation (With Kinetic Energy)
Work–energy theorem: ΔK = K_f − K_i = W_net. For a constant net force, ½m(v_f² − v_i²) = F⃗_net · Δr⃗.
- Related Glossary Terms
- Index
Chapter 5 - Introduction to Energy
Reviewed physics notes (1)
These corrections keep the original lesson’s purpose while fixing errors in the source edition.
- An arbitrary single force does not equal the total kinetic-energy change. — Reference 1
Glossary and deeper reading · 2 refreshers
These editorial refreshers supplement the reading. Definitions and examples are added guidance; original source wording and recorded answers remain in their original context.
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Mechanical work
Mechanical work is energy transferred by a force through displacement of its point of application. For a constant force on a particle, it depends on the force component along the particle’s displacement, and it can be positive, negative, or zero. For example, a magnetic force perpendicular to a particle’s displacement does zero work on that particle.
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Kinetic energy
Kinetic energy is energy associated with motion relative to a chosen reference frame. For a nonrelativistic translating object it is one half of its mass times speed squared. For example, doubling a cart’s speed quadruples its translational kinetic energy when its mass stays fixed.