measuring torque of an electric motor

So I have this project in school where i have to measure torque in such a way that I put a wheel on an electric motor and then spin it with a constant frequency. I then have to brake the motor with a rope and somehow measure how much force I am applying so I can calculate the torque. And i have to record everything so I can do a video analysis and figure out at what frequency the wheel was spinning when i applied force to it, but that's the easy part. I just can't figure out how to apply force with a rope in a precise manner. I mean all i have is a rope and some spring force meters. Any ideas?

submitted by /u/Rus02
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