Help! How to calculate impact force of a weighted pendulum?

over my head

Use the maximum swing of the pendulum. Use conservation of potential and kinetic energy to arrive at the answer. The speed of bullets is measured in this way, the bullet imbeds itself into the pendulum and the angle of the pendulum is used to measure the maximum swing of the pendulum and so calculate the original kinetic energy of the bullet.

Do you mean impulse?

As in;

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Yeah, you can set up a exiperment to find the impact fore.

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-DC