| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 1D40.00 | Motion of the Center of Mass | | |
| 1D40.10 | throw objects | PIRA 200 | A light disc contains a heavy slug that can be shifted from the center to side. Mark the center of mass. |
| 1D40.10 | throw objects | 1D40.10 | Mount battery powered lights on styrofoam shapes and throw them in the air. |
| 1D40.10 | throw objects | Mp-2 | A light wooden disc contains a heavy slug that can be shifted from the center to the side. |
| 1D40.10 | throw objects | 14-2.3 | Throw a slab of styrofoam with lights placed at the center of gravity and away from the center of gravity. |
| 1D40.11 | throw objects | 12-5.1 | A disc with a internal sliding weight has spots painted on opposite sides marking the center of mass in the two cases. |
| 1D40.11 | throw objects | M-18b.2 | Discs with movable and stationary center of mass and a "bulls eye" painted on each side, one off center. |
| 1D40.11 | center of mass disc | Disc 03-21 | Throw a disc with uniform distribution and then offset the center of mass. |
| 1D40.12 | throw hammer | 14-2.1 | Mark the center of gravity of a hammer with a white spot. Throw it in the air and attach it to a hand drill to show it rotating smoothly. |
| 1D40.13 | throw objects | 9-2.1 | A bunch of junk is tied together with strings and thrown across the room. |
| 1D40.15 | loaded bolas | PIRA 1000 | |
| 1D40.15 | loaded bolas | 1D40.15 | This was in the Physics Teacher but I haven't got to it and I've never done it so I can't describe it well at this time. |
| 1D40.20 | spinning block | PIRA 500 | |
| 1D40.20 | spinning block | 1D40.20 | A large block of wood with magic markers located at and away from the center of mass. Place the block on a large sheet of paper and hit off center with a hammer. |
| 1D40.20 | spinning block | Mp-17 | A large wood block has two holes for felt tipped pens, one on the center of mass. Put the block on paper and hit it down the paper. |
| 1D40.21 | air supported dumbell | AJP 33(10),xiii | Two dry ice pucks on the ends of a bar form a dumbbell that rides on a sheet of plate glass. Use a cue stick to hit it on and off the center of mass. |
| 1D40.21 | spinning block | 10-2.10 | Use a pool cue to hit a dumbbell double dry ice puck on or off the center of mass. Also shoot a 22 into a gas supported block on or off the center of mass. |
| 1D40.22 | air table center of mass | PIRA 1000 | |
| 1D40.22 | air table center of mass | Disc 03-27 | A weighted block glides across an air table. |
| 1D40.25 | photographing the center of mass | AJP 31(4),299 | Make an open lens photo of a system of to masses connected by a rod and the center of mass will be apparent. |
| 1D40.25 | photographing center of motion | AJP 58(5),495 | Photographing the center of velocity of a variety of rigid bodies. |
| 1D40.25 | spinning block | 10-3.2 | Strobed photo is taken of a irregular object translating and rotating on a air table. |
| 1D40.30 | throw the dumbell | 12-4.4 | A dumbbell with unequal masses is thrown without rotation when the force is applied at the center of mass. |
| 1D40.31 | throw the dumbell | AJP 30(6),471 | Stick unequal size corks in knitting needle, place a cord under at the center of mass, and jerk it into the air. |
| 1D40.35 | earth moon system | PIRA 1000 | |
| 1D40.35 | Earth-Moon system | TPT 28(6),425 | An earth-moon system hanging from a string is used to demonstrate the earth's wobble. |
| 1D40.35 | Earth-Moon system | Mp-8 | Two unequal masses are fastened to the ends of a rigid bar. Spin the system about holes drilled in the bar at and off the center of mass. |
| 1D40.35 | Earth-Moon system | Mp-18 | Pucks of different mass are held together by a string while spinning on the air table. |
| 1D40.35 | Earth-Moon system | M-169 | An Earth-Moon system is rotated from a hand drill on and off the center of gravity. |
| 1D40.50 | air track pendulum glider | PIRA 1000 | |
| 1D40.50 | air track pendulum glider | 1D40.50 | A double pendulum hangs from an air track cart with a mounted spot marking the center of mass. Set the system in oscillation and the spot will remain still or translate smoothly. |
| 1D40.50 | air track pendulum glider | Mp-1 | A pendulum with a massive bob is attached to an air cart. |
| 1D40.50 | air track pendulum glider | 9-2.3 | A heavy pendulum on a light cart. |
| 1D40.50 | air track pendulum glider | 11-1.2 | A double pendulum on an air cart has total mass equal to the cart. A marker placed on the pendulum at the center of mass is stationary as the system oscillates. |
| 1D40.51 | momentum pendulum | M-125 | A pendulum support is free to move on rollers as the pendulum swings back and forth. |
| 1D40.52 | momentum pendulum car | TPT 2(1),33 | Mount a heavy pendulum on a PSSC car and then have the students imagine the pendulum scaled up to be the earth. |
| 1D40.55 | air track inchworm | PIRA 1000 | |
| 1D40.55 | air track inchworm | 1D40.55 | A leaf spring couples two air track gliders. |
| 1D40.55 | air track inchworm | 11-1.3 | The center of mass of two carts coupled with leaf springs is marked with a light or flag. Show oscillation about the center of mass or constant velocity of c of m. |
| 1D40.55 | air track inchworm | 9-2.2 | Two carts on a track are coupled with a leaf spring and elastic. A light is mounted on the elastic at the center of mass. |
| 1D40.56 | momentum cars | M-126 | Two cars are attached together by a elastic band fastened to a motorized eccentric on one car. The point of no motion can be indicated by a pointer and changed by weighting one car. |
| 1D40.58 | rotor on a cart | 9-4.22 | Balls of equal or unequal mass can be screwed on the ends of a rod rotating horizontally about its center. The assembly is mounted on a cart on a track. The cart oscillates if the balls are of unequal mass. |
| 1D40.60 | satellite oscillation | AJP 53(10),1002 | Discussion of the LDEF satellite (30'x14'dia.) as an example where the distinction between the center of mass and center of gravity is important. |
| 1D40.70 | two circle roller | AJP 34(2),166 | Two disks, partially interlocking at right angles, roll with a wobble but with a constant height center of mass. |
| 1D40.71 | non-round rollers | TPT 28(2),122 | Two types of weird rollers: one in which the center of mass remains at a uniform distance from the surface as it wobbles down an incline, and two which although non round have a constant diameter. |