3B SCIENTIFIC PHYSICS U119831 Mode D'emploi page 2

3B SCIENTIFIC ® PHYSICS
Free-Fall and Horizontal Launch Equipment U119831
Instruction sheet
12/07 ALF
1. Safety instructions
Projectiles are launched with a large amount of en-
ergy.
Be careful that no one is in the way of the balls where
they might get hurt.
2. Description
The equipment is used to demonstrate superimposi-
tion of vertical and horizontal motion with no exter-
nal influences.
A launching rail with returning spring is mounted on
a wooden base. Two steel balls are used as test bod-
ies. Upon triggering, one ball starts to fall downwards
and simultaneously the other is launched horizon-
tally. Both balls hit the ground at the same time. Two
holes in the base plate are provided for storing the
balls.
3. Technical data
Ball diameter:
Dimensions:
Mass:
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany •
15 mm
200x120x40 mm³ approx.
1 kg approx.
Subject to technical amendments
© Copyright 2007 3B Scientific GmbH
1 Launch rail
2 Base plate
3 Spring
4 Rubber stopper
5 Steel ball
6 Trigger
7 Ball socket
4. Operation
•
Place the equipment at the end of a bench such
that one of the balls can drop unimpeded to the
ground and there is about 2 m of room for the
other ball to be launched as a projectile.
•
Arm the launch rail using the spring to keep it
under tension and set the trigger to keep it tight-
ened.
•
Lay the balls in the recesses at the end of the
launch rail.
•
Hold the base plate firm and still then press the
trigger and launch the balls.
Despite their differing trajectories, both balls will be
seen to strike the floor at the same moment.
Acceleration due to gravity g is therefore independent
of any movement in the horizontal direction.
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