# Answer to Question #9654 in Mechanics | Relativity for kapil

Question #9654

state the relation between mass and inertia.

Expert's answer

The inertial mass of an object determines its acceleration in the presence of an applied force. According to Newton's second law of motion, if a body of fixed mass

agravitational field. If a first body of mass

gravitational mass are equivalent; since 1915, this observation has been

entailed

*M*is subjected to a force**F**, its acceleration**α**is given by**F**/*M*. A body's mass also determines the degree to which it generates or is affected byagravitational field. If a first body of mass

*M*_{A}is placed at a distance*r*from a second body of mass*M*_{B}, each body experiences an attractive force*F*_{G}whose magnitude is*F*_{G}=*GM*_{A}*M*_{B}/*r*^{2}, where*G*is the universal constant of gravitation, equal to 6.67×10^{−11}N·m^{2}·kg^{−2}. This is sometimes referred to as gravitational mass.^{[note 1]}Repeated experiments since the 17th century have demonstrated that inertial andgravitational mass are equivalent; since 1915, this observation has been

entailed

*a priori*in the equivalence principle of general relativity.Need a fast expert's response?

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