Discussion Questions This part of the lab is to be completed with your group in class. 4. Fig. 2 shows two paths followed by a cannonball (assuming no air resistance). Cannonball A dropped vertically with a starting speed of zero. Cannonball B fired horizontally with some initial horizontal velocity. What effect does gravity have on the cannonball's horizontal motion and vertical motion? [2 pts] Fig. 2 - Cannonball projectile motion 5. In projectile motion shown in Fig 1 and Fig 2, as the air friction is neglected, what are the forces acting in the x direction and y direction? [2 pts] 6. Based on your investigation of parabolic motion, fill out the following table with your group: [3 pts] Horizontal Vertical Motion Motion Forces (after the initial push) - present and if so, what direction? Acceleration (after the initial push) - present and if so, what direction? Velocity - constant or changing? 27