How do you find the mass of a brick without weighing it?

Did you learn F = ma ?
If so, you can re-arrange the equation to read:
m = F/a where m is an unknown mass.

So if you apply a known force F and measure the acceleration a, you can then calculate m.

In my high school physics lab (lo these many decades ago...) we mounted a brick on a roller skate & measured acceleration when pulled horizontally by a hanging weight attached by string & pulley.

I might try something like determine the volume of the brick, by computing the volume of water that it displaces. Then find the density of brick in a book of tables, and multiply the two numbers together.

Or, perhaps I might subject the brick to a known force for a fixed amount of time. Since we have F = ma, then we could compute the mass given the velocity the brick attains from the impulse applied. This will allow you to compute the mass, without ever explicitly weighing it.

Have SOMEONE ELSE weigh it, then have them give you a full report.

That way, you have your answer, but YOU didn't weigh it.

+5

Water displacement.

Mass=Force/Acceleration.

Just accelerate the brick, find out the force it exerts, divide the force by the acceleration, easy peasy.

throw it through a window and count glass displacement-according to the greek arry stotle