Research on the daily experiment project of class name: the purpose of the experiment is 1. Draw the trajectory of a flat projectile. 2. Find the initial velocity of the flat projectile. The experimental principle is that the flat throwing motion can be regarded as a combination of horizontal uniform linear motion and vertical free falling motion. Just measure (x, y from x=V0t y= x, white paper, thumbtacks, boards, punched cardboard cards, balls, heavy hammer lines, meter-foot steps 1 at a certain point on the motion trajectory. Nail the white paper to the vertical board with thumbtacks. 2. Fix the chute in the upper left corner of the plate and make the tangent of the end point horizontal. Record the o point on the paper. 4. Draw a vertical line through point O with a thick vertical line. 5. Hold the card on the plane of the board by hand, 6. Keep the blank side of the card horizontal, 7. Adjust the position of the card, 8. Make the ball rolling down the groove just pass through the hole of the card, 9. Then use a pencil to point a black spot at the gap of the card, 10. This records the point where the trajectory of the ball is flattened. Many experiments, 1 1. Draw multiple points. 12. Connect the points passed by the ball with smooth curves, and 13. The trajectory of flat throwing motion of the ball is obtained. 14. Take o as the point, 15. Draw a vertical Y axis and a horizontal right X axis. 16. Choose four different points A, B, C and D from the curve 18. Measure their coordinates, 65438. According to the formula V0=x, the initial velocity of each flat throwing motion of the ball is obtained, and then the average value of V0 is obtained. Experimental record x (m) y (m) V0 (m/s) V0 (average) A B C D empirical analysis 1. Experimental notes: a. wooden board for fixing white paper. B when fixing the chute, ensure that the chute has no end. C. the ball slides down the groove every time. D accurately write down the position of the gap on the white paper, and record it as. 2. Experimental error: (1) When calculating the initial velocity of the ball, choose a place slightly away from the throwing point on the trajectory. (2) After the plate and the chute are fixed, their positions will not change during the experiment. Practical operation 1. In the experiment of studying the motion of a flat projectile, the falling height h and the corresponding range x have been measured as follows, so the initial velocity of the flat projectile is. (g = 9.8m /S2) Height (m) 5.001.25 20.00 24.20x (m). Why must the tangent at the end of the chute be horizontal in the experiment? Answer: Please design a method to measure the bullet speed of toy pistol according to the experimental idea of flat throwing motion. (1) equipment: (2) steps: (3) pistol bullet speed V0=. (in letters) Teacher's comment score 10 Respondent: Hengzhan.