What is inertial mass?
Quick Answer
Inertial mass is a measure of how much an object resists changes in motion. The larger the inertial mass, the harder it is to accelerate or slow down the object.
The Full Story
Inertial mass appears in Newton’s second law, where force equals mass times acceleration. It tells you how strongly an object resists being pushed, pulled, or stopped. In everyday terms, a bowling ball has more inertial mass than a tennis ball because it takes more force to change its motion. In modern physics, inertial mass is the same as gravitational mass to extremely high precision, which is the basis of the equivalence principle. This equality is one of the deep facts that general relativity explains.
Key Facts
YouTube Angle
Suggested video title for this topic:
"Why some things are harder to move than others"
Was this answer helpful?
Tap a reaction — it helps us pick what to cover next.