PASCO ME-6831 Ballistic Pendulum_Projectile Launcher User Manual
Page 20
P r o j e c t i l e L a u n c h e r
E x p . 2 : P r o j e c t i l e M o t i o n U s i n g P h o t o g a t e s
®
16
012-05375C
4.
Calculate the initial speed of the ball based on the 0.10 m distance between the photogates. Record the value.
Data Table: Part A
Part B: Predicting the Range of a Ball Shot at an Angle
1.
Keep the angle of the Projectile Launcher at the original angle above horizontal.
2.
Measure the vertical distance from the bottom of the ball as it leaves the barrel to the
floor. Record this distance in Data Table 2.2.
•
The “Launch Position of Ball” in the barrel is marked on the label on the side of the
Launcher.
3.
Use the vertical distance, the angle, and the initial speed to calculate the time of flight.
Record the value.
4.
Use the time of flight, t, angle,
, and initial speed, v
0
, to predict the horizontal distance
(range, x = (v
0
cos
t). Record the predicted range.
5.
Draw a line across the middle of a white piece of paper and tape the paper on the floor so the line is at the pre-
dicted horizontal distance. Cover the white paper with carbon paper and tape the carbon paper in place.
6.
Use a plumb bob to find the point on the floor that is directly beneath the release point on the barrel. Measure
the horizontal distance along the floor from the release point to the leading edge of the piece of white paper.
Record the distance in the Data Table.
7.
Shoot the ball ten times.
8.
Carefully remove the carbon paper and measure from the leading edge of the white paper to each of the ten
dots. Record these distances in the Data Table and find the average. Calculate and record the total horizontal
distance (distance to paper plus average distance from edge of paper to dots).
Angle above horizontal = ______________ Horizontal distance to edge of paper = _______________
Calculated time of flight = _________________ Predicted range = ________________
Table 2.1: Determine the Initial Speed
Trial
Time
1
2
3
Average Time
Initial Speed
Bottom
of ball
y
y
0
v
0
sin
t 1
2
---gt
2
–
+
=