3. PROCEDURE: 3.1 Determination of the initial velocity (see Figure 1). a. Set t

Question

3. PROCEDURE: 3.1 Determination of the initial velocity (see Figure 1). a. Set the launcher at the edge of the table, and clamp it to the table. b. Using a plumb to pinpoint the position of the mouth of the launcher on the ground, measure the height of the launcher above the ground, y (m). Report c. Use the ramrod to "load" the launcher; use the low range setting. d. Shoot the projectile 5 times. Measure the range x (m) for cach experiment. Report the avcrage For cach shot, record the time taken by the projectile to cross the photogates which are f. Calculate the initial velocity using the values of y and x you measured (assume the value of g. Calculate the initial velocity using the time taken by the projectile to cross the photogates h. Calculate the percent crror between the accepted and experimental values of the initial i. Repeat procedures e through h for the medium and high settings of the launcher. exactly 10 cm apart. Report the average of the times. the acceleration of gravity to be 9.80 m/s). Report this as the experimental velocity. and the fact that the photogates are 10 cm apart. Report this as the accepted value. velocities. 3.2 Determination of the range of the projectile - level target -see figure 2. Using the experimental value of the velocity for the medium scting, determine the range of the projectile for an angle of incidence of 35 degrees and a target at the same level as the launcher. a. b. Set the launcher at an angle of 35 degrees. Use the attached plumb to set the angle. The instructor will set the target box at the position you calculated. c. d. Shoot! You have ONE TRY!! Your calculations had better be correct!! career as a physicist is seriously jcopardized! If you miss, your Verify that the range is the same for a complementary launching angle e. Set the launcher at 55 degrees. Do not touch the target box. f. Tell the instructor when you are ready to shoot. g. Shoot! If your calculations were right the first time around, you should hit the target. Launcher Target Box

Explanation / Answer

1) Far projectile gone =   10 * cos60 * sqrt(2 * 50/9.8)

                                     = 15.97 m

2)    Far projectile gone on moon =   10 * cos60 * sqrt(6 * 2 * 50/9.8)

                                    = 39.123 m

3)    Range of projectile would remain same as horizontal velocity would remain unaffected .

4)    Maximum height of projectile would become lower than in lab   because resultant vertical velocity would decrease .

5)   Distance travelled by projectile would become shorter than in lab   because resultant horizontal velocity would decrease .  

Fixed observer will describe it as an elliptical motion .

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