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The mass of an object is a measure of the amount of matter in a body.[1] A mountain has typically more mass than a rock, for instance. Mass should not be confused with the related but quite different concept of weight.
We can measure the mass of an object if a force acts on the object. If the mass is greater, the object will have less acceleration (change in its motion). This measure of mass is called inertial mass because it measures inertia.[2]
A large mass like the Earth will attract a small mass like a human being with enough force to keep the human being from floating away. "Mass attraction" is another word for gravity, a force that exists between all matter. When we measure the force of gravity from an object, we can find its gravitational mass. Tests of inertial and gravitational mass show that they are the same or almost the same.[2]
- ↑ Tsokos, K. A. (2005). Physics for the IB Diploma. Cambridge, United Kingdom: Cambridge University Press. p. 63. ISBN 9780521604055.
- ↑ 2.0 2.1 Knight, Randall Dewey (2003). Physics for scientists and engineers with modern physics : a strategic approach. San Francisco: Pearson/Addison-Wesley. p. 349. ISBN 0-321-24329-3. OCLC 54427199.