I calculated change in momentum by multiplying change in velocity by mass. Next I recorded change in velocity and duration of the collision by subtracting the velocity and time at the beginning of the collision from the velocity and time values at the end of the collision. #IMPULSIVE FORCE MODEL MOMENTUM IN COLLISIONS LAB ANSWERS PRO#First I selected the collision intervals and evaluated them by pressing the integral button on Logger Pro that fills in the dip. Next it was time to evaluate the data we had collected. We performed the three runs again with the same varying amounts of weight (.25 kg. This set up made the cart stop completely when it collided with the bumper, allowing us to record data about inelastic collisions. We attached clay to the front of the cart and to the bumper. Below is a video of the procedure.įor the next part of the lab, we exchanged the spring bumper with a clay holder bumper. We sent the cart down the track three times-each time with a different weight attached (.25 kg. As this occurred, Logger Pro gathered data points on the two graphs. The cart collided with the bumper and was propelled backwards down the track. Next, Chloe launched the cart towards the force sensor/bumper. For the first part of the lab (elastic collisions) we attached the hoop spring bumper to the force sensor. The duration of the experiment was reduced to five seconds. We adjusted the data collection rate so that Logger Pro gathered 500 samples/second. time and the other displaying velocity vs. On our laptop we opened two Logger Pro graphs: one displaying force vs. The video below shows an airbag working properly followed by an airbag that fails to vent:Īfter gathering our materials, we set up the system we would use during the lab: a track lying level on a table, at one end a motion detector, and at the other a vernier bumper and a force sensor. The airbag would likely burst when hit by a body’s mass, and the body would continue forward through the windshield uninhibited and unprotected by the airbag. It would exert almost the same amount of force on the body as a solid surface. The airbag would not be nearly as effective. Would they be as effective in protecting a passenger in a collision? Suppose airbags were not vented to allow the gas inside to escape, but remained inflated (like a balloon). An airbag acts gradually, keeping the body relatively safe in comparison. A hard surface would simply crash against the body’s mass and bring it to a stop by applying a massive amount of force in a single second. Airbags allow a body in motion to stop gradually by absorbing the motion of the body’s mass. This is true whether or not an airbag is used, so why use an airbag? How does it reduce injuries?Īirbags reduce injury because they exert far less force on a person than would a dashboard or windshield. #IMPULSIVE FORCE MODEL MOMENTUM IN COLLISIONS LAB ANSWERS DRIVERS#In a car collision, the drivers body must change speed from a high value to zero. (*Don't believe it? Check out the Momentum Lab that proves the conservation of momentum in all situations.Purpose: “To collect force, velocity, and time data as a cart experiences different types of collisions and to determine an expression for the change in momentum, delta p, in terms of the force and duration of a collision.”Ĭ(1): Following directions and instructionsī(3): Mathematical modeling of linear relationship In either case, collisions with no external forces, momentum is conserved. If the kinetic energy changes, then the collision is inelastic regardless of whether the objects stick together or not. If the kinetic energy is the same, then the collision is elastic. When objects don't stick together, we can figure out the type of collision by finding the initial kinetic energy and comparing it with the final kinetic energy. If objects stick together, then a collision is a completely inelastic. Reverse inelastic collision where momentum is conserved and kinetic energy increases.Collisions where the objects stick together and have the same final velocity.
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