Concepts •If a body is motionless (at rest) with respect to the nearest large mass (in our case-the Earth), it is said to bein equilibrium. •A body at rest must respond in accordance with Newton's First Law.generic body •A collection of particles is called a bodyor object. •If the body does not deform appreciably upon load application, we call it arigid body.
Newton's First Law for a Generic Body If the resultant forces and moments acting on a body are zero, the body remains at rest (or moving at constant velocity). 00FM==
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