Measure the mass of Wally . Mass :________kg What is his velocity before you activate the fire extinguisher? Average velocity before: ________m/s Fire the extinguisher for about 500 ms. Recall that a millisecond (ms) is 1/1000 of a second. How long was the fire extinguisher activate for? (please convert to seconds) Force Time: ________________s What is the force of the fire extinguisher? Force: _______________ N Calculate the impulse, using Impulse = Force x time I = ________________ kg m/s What is the distance between the photogates? Distance = ____________________m How long did it take him to pass through the photogates? (please convert to seconds) Photogate Time = ___________________ s What is his velocity as he passed through the photogates? Use distance = speed x time. Show your work Average velocity after: ________m/s Calculate momentum of the Wally before and the momentum after the fire extinguisher was activated. Recall that momentum = mass x velocity. Show your calculations and record your results below. Initial momentum = _____________ kg m/s Final momentum = _____________ kg m/s Now calculate the change in momentum, Momentum final - momentum initial. Show your work. (massxvelocity) = _______________ kg m/s Did the calculated change in momentum of Wally equal the measured impulse applied to him by the fire extinguisher during the time that it was activated? Repeat the activity, this time allowing the fire extinguisher to be activated for 1000 ms. What do you think will happen to his speed when this happens? Was the impulse equal to the change in momentum? Force: Force Time: Impulse: Velocity Before: Velocity After: Momentum Before: Momentum After: Change in Momentum: