Motion and force analysis of two objects bound by rope

A is subjected to a constant force F in the horizontal direction to the right (B is on the left). Let the angle between the rope at the end of A and the horizontal plane be θ, and the speed of A moving in a straight line at a constant speed is V0, then the rising speed of B is V=V0cosθ, so it is obvious that B is moving in an accelerated straight line. Assuming that the rope Zhang Liwei T between A and B moves in a straight line at a uniform speed, the conditions for A to move in a straight line must satisfy the equations of T and θ in the figure below, where μ is the dynamic friction coefficient tanφ=μ, it is not difficult to deduce that T decreases continuously during the movement of A, so the acceleration of A decreases continuously, that is, B moves vertically upward with variable acceleration, and the resultant force increases and decreases continuously.

That is to say, the tension of the rope is decreasing, but as long as the rope is long enough, the tension is always greater than the gravity of B.

The tension between A and rope, rope and B is equal.

If AB is placed on a horizontal table and connected with thin rope (direct connection without crown block), the pulling force between A and rope, and between rope and B is acting force and reaction force. B. the magnitude and direction of rope tension remain unchanged.

A and B move in a straight line at the same speed. End! ! !