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--- demonstrations:1_mechanics:1d_motion_in_two_dimensions:water_trajectories:start [2019/02/14 23:33] – external edit 127.0.0.1
+++ demonstrations:1_mechanics:1d_motion_in_two_dimensions:water_trajectories:start [2019/04/29 23:00] (current) – demoroom
@@ Line 1: / Line 1: @@
 ====== Water Trajectories ======
-{{tag>tub cylinder projectile motion trajectory needs_review untagged unlocated}}
+{{tag> mechanics water pressure projectile_motion unlocated}}
 <WRAP box right>
@@ Line 11: / Line 11: @@
 ===== Description =====
-Parabolic path of water.    Classes Used: PHYS 101
+Consists of a plated brass tube (so it's silver-colored) mounted on a piece of thick plexiglass. Three holes are drilled in the side at regular intervals.
-projectile motion   Updated on: 06/13/13
 ===== Purpose =====
+To show different parabola paths of water in projectile motion and as an exercise in predicting range in projectiles. Also works well to illustrate how water pressure varies as a function of depth, and to show how flow rate varies as a function of pressure.
-To show different parabola paths of water in projectile motion and as an exercise in predicting range in projectiles.
 ===== Apparatus =====
+  * Water trajectories cylinder
-Metal cylinder, adhesive tape, rubber tubing from tap
+  * Water tank (the one from ((demonstrations:3_oscillations_and_waves:mechanical_waves:ripple_tank_wave_demonstration:start|this demo)) works well.)
+  * Adhesive tape
 ===== Setup =====
-The metal cylinder has holes bored at a spacing such that when the cylinder is completely full to a height 4H then water is ejected at heights H, 2H and 3H  Cover the three holes temporarily with tape and fill the cylinder with water. Have a water hose from the tap ready to maintain the cylinder full of water and then uncover the holes.  The initial velocity of projection will decrease as we consider the exit holes from the bottom up but the range of the jets of water tend to be about the same although the top hole in the demonstration generally gives the shortest range.
+The metal cylinder has holes bored at a spacing such that when the cylinder is completely full to a height 4H then water is ejected at heights H, 2H and 3H  Cover the three holes temporarily with tape and fill the cylinder with water. Then remove the tape, making sure that the water will drain into the tank.
 ===== Notes =====
+If a tap is available in the room, it can be used to keep the water level topped up so that the trajectories of the water remain constant while you measure them or talk about them.