1. Add a 250 g weight bar to car two. Make sure the plungers of 0.85 both cars are pushed in. Place car two in the center of the track. Place car one about 30 cm from the motion senor . Make V 0.80 sure the velcro ends of both cars point inward (toward from each Run #2 . other). 0.75 2. Press the Record on the control display. Push car one toward car two. The motion sensor will record the velocity of car 1 and 0.70 stop automatically. 0.65 Max.: 0.642 3. Scale to fit the data to the display and center both graphs about the collision. Select the data points just before to just after 0.60 the collision. 0.55 4. The max value of the velocity is the initial velocity of car 1 0.50 A Velocity (m/s) while the min value of the velocity is the fial velocity of boht cars. oTake the initial velocity of car 2 to be zero. Determine the Total 0.45 O momentum before and after the collision and record. Compute 0.40 and record the percent difference between the total momentum before and after the collision 0.35 m1 = 0.255 kg m2 = 0.505 kg 0.30 0.25 Total Momentum: (Ptotal)i = kg m/s (Ptotal)f = kg m/s 0.20 Min. : 0.191 0.15 % Difference = % 0.10 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 Time (s) oi Car 1 Velocity vs Time O