A block of mass m1 and another of mass m2 are connected by a cord that passes over a pulley.
This is a standare textbook problem.
However, what if the pulley was being accelerated upward by an external force F
(adjusted by right slider bar).
You can change mass or external force and water how the tension force changed!

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Enjoy the fun of Physics! You can access this simulation online from
Accelerated pulley
Designed by Fu-Kwun Hwang (http://www.phy.ntnu.edu.tw/ntnujava/)
Deptartment of Physics, National Taiwan Normal University, Taiwan