# Dynamics( kinematics of particles)

Jul 5th, 2016
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Engineering Mechanics: Dynamics Dynamics Branch of mechanics that deals with the motionof bodies under the action of forces(Accelerated Motion) Two distinct parts: Kinematics study of motion without reference to the forces thatcause motion or are generated as a result of motion Kinetics relates the action of forces on bodies to theirresulting motionsEngineering Mechanics: Dynamics Basis of rigid body dynamics Newtons 2nd law of motion A particle of mass m acted upon by anunbalanced force F experiences an accelerationa that has the same direction as the force and amagnitude that is directly proportional to theforce a is the resulting acceleration measured in a nonaccelerating frame of referenceEngineering Mechanics: Dynamics Space Geometric region occupied by bodies Reference system Linear or angular measurements Primary reference system or astronomical frameof reference Imaginary set of rectangular axes fixed in space Validity for measurements for velocity < speed of light Absolute measurements Reference frame attached to the earth?? Time MassEngineering Mechanics: Dynamics Newtons law of gravitationm1m2F G 2r F :: mutual force of attraction between twoparticles G :: universal gravitational constant 6.673x10-11 m3/(kg.s2)Engineering Mechanics: Dynamics Weight Only significant gravitational force between the e

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