A metal bar has a frictionless axle going through its center of mass. You notice
ID: 1457475 • Letter: A
Question
A metal bar has a frictionless axle going through its center of mass. You notice that the bar is not level (flat), but that it is tilted at a 30 degree angle (the right end is below the horizontal and the left end is above the horizontal) and that the bar is not rotating away from this orientation. You can say that:
a. The net force isn't zero and the net torque is counter-clockwise on the bar
b. The net force is zero but the net torque is counter-clockwise in the bar
c. The net force is zero bot the net torque is clockwise on the bar
d. The net force isn't zero and the net torque is clockwise on the bar
e. The net force is zero and the net torque is zero on the bar
Explain please.
Explanation / Answer
as bar is not rotating as well as not translating so net force and net torque on the bar is zero. If there is any net force then bar must move in translation motion If there is any net torque then it must rotate but it is stationary so no net torque and force is acting on the bar.
e. The net force is zero and the net torque is zero on the bar