Projectile Motion (Experiment # 4)

Cebu Institute of Technology-University
Cebu City

Physics Department

PHYSICS 201
(Laboratory)

“Final Report”
Mid-term
(Name, Course, Year) (Date Submitted)

Experiment No. 4 Group #2, 11:30-2:30, Friday Group No,/Time/Day

Engr. Genaro Ortega
Instructor
I. Title: Projectile Motion
II. Objectives: To study motion of a projectile
III. Apparatus: Launcher, iron stand, metal ball, steel tape
IV. Procedure
Part I. Elevated Body
1. The launcher was mounted on the iron stand and the metal ball was placed into the launcher.
2. The vertical distance was measured or position of the ball from the floor to the launcher.
3. The launcher was fired by pulling on the string and the approximate place where the ball strikes the floor was noted.
4. A clean sheet of paper was placed at that approximate location on the floor. This arrangement automatically marks the spot when the ball strikes the paper.
5. The launcher was fired five times and the horizontal distance traveled by the ball was measured.
6. The initial velocity of the ball was solved (magnitude and direction) using the appropriate formula.

Part II. Body Projected at an Angle
1. The launcher on the iron stand was mounted and its muzzle was positioned on one end of the laboratory table.
2. The launcher was adjusted so that the ball will be shot at the desired angles.
3. The launcher was fired at an angle of 15o and the approximate place where the ball strikes the table was noted.
4. The range of the ball was measured using a steel tape.
5. Steps 3 and 4 was repeated but this time 30o, 45o, 60o, and 75o were used.
6. The appropriate formula was computed using the following quantities:
a. Total time flight;
b. Maximum height attained; and
c. Range of the projectile

V. Data and Results:
Part 1: Elevated Body

Trial h x t Vo
1
0.848
2.0
0.42
4.76
2
0.848
2.017
0.42
4.8
3
0.848
2.012
0.42
4.79
4
0.848
2.017
0.42
4.8
5
0.848
2.027
0.42
4.83

Part 2: Body Projected at an Angle

Trial
Vo

T
H
Robs
Rcomp
%Diff
1
4.8
15
0.25
0.08
1.06
1.20
11.67
2
4.8
30
0.49
0.329
2.145
2.07
3.50
3
4.8
45
0.69
0.59
2.713
2.39
11.91
4
4.8
60
0.85
0.89
2.683
2.07
22.76
5
4.8
75
0.95
1.10
1.474
1.20
18.59

VI. Data Analysis:
1. Sketch and label the trajectory of the ball of every angle of projection.

2. Compare and contrast the magnitude of rage, total time of flight, and maximum height corresponding to the different angles of projection. Account for the similarities or differences among these values.
-The projectile which was fired at a higher angle has a higher magnitude or range, total time of flight and maximum height, compared to the projectiles fire at a lower angle. 3. Explain the effect of changing the angle of projection on the magnitude of a. Range – the formula for the range is which shows that the angle Directly proportional to the range, which means that increasing the angle Of projection increases the range of the projectile and vice versa. b. Maximum height – The formula for the maximum height is which shows that the angle of projection is directly proportional to the maximum height, which means that increasing the angle of projection increases the maximum height of the projectile and vice versa. c. Time of flight – The formula for the the time of flight is which shows that the angle of projection is directly proportional to the time of flight, which means that increasing the angle of projection increases the time of flight of the projectile and vice versa.
VII. Problem:
1. A physics professor did daredevil stunts in his spare time. His last stunt was to attempt to jump across a river on a motorcycle. The take-off ramp was inclined at 53˚, the river was 40m wide and the far bank was 15m lower than the top of the ramp. The river itself was 100m below the ramp. What should his velocity have been at the top of the ramp to have just made it to the edge of the far bank? 53˚ t = = h = 100m ? t = = 8.85m/s x = 40m t = 4.52s

VIII. Conclusion Therefore, as stated on this experiment it merely study for the motion of a projectile that has a big use for us humans.