analyze and answer question 1-4

Safety precautions Please be careful when you get up on the laboratory chair and again when you step off it Rather support yourself with at least one hand on the bench while you get on and off. Place the leading foot in the middle of the chair and not off to the side of the chair. Best someone supports you while you climb onto and get off the lab chair. Do not use the metal arm with the lamp above the bench to support you, it is too weak. Apparatus One large wooden board with a piece of paper taped on top of it. The board should have no dirt on it and the paper should be as flat and tight as possible. Two round plastic discs, one large and one small. The large disc is placed on the paper with the dimple. for your shooting finger, on top. A wooden ruler for calibration purposes. A protractor used to draw the vector arrows in their respective directions in your report book. . . An elastic band. A digital camera to record the collision and a cable to download the videos onto the computer. A lamp mounted above the board. A computer with the Tracker program installed on it. Filming the collision 1. Place the objects on top of the paper on the board as in figure 6.1. 2. Delete the videos on the camera's memory card and select the high definition, HD, movie mode. Also set the camera in the Auto mode. 3. Mount the camera above the wooden board next to the lamp on the metal arm above the bench The camera should be pointing down towards the board. 4. Slide the board so that the target disc is positioned below the lens of the camera. Make su that the ruler is included in the camera's image. 5. Switch the lamp on. 6. Practice shooting the striker towards the target so that both discs move off at an angle v respect to each after the collision. 7. Make recordings of several successful collisions. Question 1 Do the discs travel with a constant speed along their tracks? Question 2 Do you therefore expect that the resultant momentum of the system of discs w conserved? Why? Question 3 Name the external force that will alter the resultant momentum of the system of di Question 4 Explain why we should measure the speed of the discs just before and just af collision and not when they are far away from the point where they collided