Figure (a) and (b) shows two different arrangements of a spool being pulled with a constant force F in each case. Identify the direction of motion of the centre of mass, and the direction of friction force in each case. a. The CM moves along……………….x-axis . b. The friction force acts along………………….x-axis. c. The CM moves along .....x-axis. d. The friction force acts along……………..x-axis.

Figure (a) and (b) shows two different arrangements of a spool being p

1.	Figure (a) and (b) shows two different arrangements of a spool being pulled with a constant force F in each case. Identify the direction of motion of the centre of mass, and the direction of friction force in each case. a. The CM moves along……………….x-axis . b. The friction force acts along………………….x-axis. c. The CM moves along .....x-axis. d. The friction force acts along……………..x-axis.
Answer» Solution : a. The `CM` moves ALONG the positive `X`-axis because the rest torque about the POINT of contactis clockwise. b. The friction force ACTS along the negative `x` axis. In the absence of friction force, point `O` has a tendency to MOVE along the positive `x`-axis. c. The `CM` moves along the negative `x` axis because the at torque about the point o contact is anticlockwise. d. The friction force acts along the negative `x`-axis. No other force is acting along the `x`-axis that can acceleration the centre of mass along the negative `x`-axis.