Describe the motion of the ball- bearing and comment on the force acting upon it in interval OC and DE? (2)?

In interval OC, the ball-bearing is moving in a straight line with constant velocity. The force acting upon it in this interval is equal to the force of friction, which is opposing the motion of the ball-bearing.

In interval DE, the ball-bearing is accelerating as it moves down the incline. The force acting upon it in this interval is the force of gravity, which is pulling the ball-bearing down the incline. Additionally, there may be a component of the force of friction acting against the motion of the ball-bearing as it moves down the incline.

Interval OC:

- Motion: The ball-bearing moves with constant velocity in a straight line.
- Force: The only force acting on the ball-bearing is the force of gravity, which is acting vertically downward. However, since the ball-bearing is moving horizontally, this force does not affect its motion.

Interval DE:

- Motion: The ball-bearing moves with increasing velocity in a straight line.
- Force: The force of gravity is still acting on the ball-bearing, but now it is also being acted upon by a force in the direction of its motion (the force of air resistance). This force is opposing the motion of the ball-bearing and is causing it to slow down.