17) In dynamics, the friction force acting on a moving object is always a) in th
ID: 2268824 • Letter: 1
Question
17) In dynamics, the friction force acting on a moving object is always a) in the same direction of its motion b) a kinetic friction c) a static friction d) zero 18) If a particle is connected to a spring, the elastic spring force is expressed by F-ks. The "s" in this equation is a) the spring constant b) the undeformed length of the spring c) difference between deformed and undeformed length d) deformed length of the spring 19) If applicable, the method of instantaneous center can be used to determine the of any point on a rigid body. a) velocity b) acceleration c) velocity and acceleration d) forceExplanation / Answer
17. ans: b kinetic friction
In dynamics, the friction force acting on a mving object is always kinetic friction. friction force always acts opposite to the motion of object and for the moving object it is kinetic friction.
18.ans:d deformed length of the spring
if a particle is connected to a spring, the elastic spring force is expressed by f=ks, the s in this equation is deformed length of the spring. s denoted the extension of the spring here it is the deformed length.
19.ans:a velocity
if applicable, the method of instantaneous center can be used to determine the velocity of any point on a rigid body.instantaneous method always is used to calculate the velocity.
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