PASCO ME-8950A COMPLETE ROTATIONAL SYSTEM - Manual (Page 15)

012-05293F Complete Rotational System
11
CAUTION! DO NOT LOOK DOWN BARREL!
CAUTION! DO NOT LOOK DOWN BARREL!
CAUTION! DO NOT LOOK DOWN THE BARREL.
LONG RANGE MEDIUM RANGE SHORT RANGE
Position of Ball
Launch
SHORT RANGE PROJECTILE LAUNCHER ME-6800
Yellow Band in Window Indicates Range. 90 80
70 60 50 40 30 20 10 0
WEAR SAFETY GLASSES WHEN IN USE.
Use 25 mm
balls ONLY!
Part I: Determining the initial velocity of the ball
Setup
1. Clamp the Projectile Launcher to a sturdy table near one end of the table.
2. Adjust the angle of the Projectile Launcher to zero degrees so the ball will be shot off
horizontally. See Figure 1.3.
Procedure
1. Put the ball into the Projectile Launcher and cock it to the long range position. Fire
one shot to locate where the ball hits the floor. At this position, tape a piece of white
paper to the floor. Place a piece of carbon paper (carbon-side down) on top of this
paper and tape it down. When the ball hits the floor, it will leave a mark on the white
paper.
2. Fire about ten shots.
3. Measure the vertical distance from the bottom of the ball as it leaves the barrel (this position is
marked on the side of the barrel) to the floor. Record
this distance in Table 1.1.
4. 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 paper.
Record in Table 1.1.
5. Measure from the leading edge of the paper
to each of the ten dots and record these dis-
tances in Table 1.1.
6. Find the average of the ten distances and
record in Table 1.1.
7. Using the vertical distance and the average
horizontal distance, calculate the time of
flight and the initial velocity of the ball.
Record in Table 1.1 and Table 1.4.
Alternate Method: Determining the Muzzle
Velocity with Photogates
1. Attach the photogate bracket to the
Launcher and attach two Photogates to the
bracket. Plug the Photogates into a com-
puter or other timer.
2. Put the ball into the Projectile Launcher and
cock it to the long range position.
3. Run the DataStudio program. Set it to measure the time between the ball blocking the two Photo-
gates as it comes out of the Launcher.
4. Shoot the ball three times and take the average of these times. Record in Table 1.2.
Figure 1.3 Projectile
Launcher Setup
Trial Number Distance
Average
Total Distance
1
2
3
4
5
6
7
8
9
10
Vertical distance =
Horizontal distance to edge of paper =
Initial velocity =
Table 1.1 Determining the Initial Velocity
Projectile
Launcher
clamp