Inertial Mass
Reference from the original Physics I textbook.
- Inertial Mass
Inertial mass measures an object’s resistance to acceleration: for constant mass, ΣF⃗ = ma⃗. Photons have zero rest mass while carrying energy E = hf and momentum p = E/c.
- Index
Reviewed physics notes (1)
These corrections keep the original lesson’s purpose while fixing errors in the source edition.
- Source falsely defines inertial mass as densely packed photons. — Reference 1, Reference 2
Glossary and deeper reading · 1 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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Inertial mass
Inertial mass measures how strongly an object resists acceleration under a given net force. It is the mass in Newton’s second law and is measured in kilograms. For example, comparing accelerations under the same calibrated force lets an experiment compare two objects’ inertial masses.