| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 1J30.00 | Resolution of Forces | | |
| 1J30.10 | suspended block | PIRA 200 | Forces parallel and perpendicular to the plane will support the car midair when the plane is removed. |
| 1J30.10 | suspended block | 1J30.10 | A 3-4-5 triangle holding a block. Add counterweights and remove the incline. |
| 1J30.10 | suspended block | Mj-2 | The components of force of a block on an inclined plane are countered by weights. The plane is then removed. |
| 1J30.10 | suspended block | 14-3.3 | A 5-6-7 suspended block system is used to show the pulleys can be moved as long as the angle remains constant. |
| 1J30.10 | suspended block | M-18 | Forces parallel and perpendicular to the plane will support the car when the plane is removed. |
| 1J30.10 | load on removable incline | Disc 04-03 | Place a cart on a removable 30 degree incline. |
| 1J30.15 | normal force | PIRA 1000 | |
| 1J30.15 | normal force | 1J30.15 | A block on an incline has an arrow mounted from the center of mass perpendicular to the surface with "N" on the arrowhead and another arrow hanging from the center of mass with a "g" on the arrowhead. |
| 1J30.18 | hanging the plank | M-9 | A heavy plank is suspended from three spring scales in several configurations: series, parallel, and a combination. |
| 1J30.20 | tension in a string | PIRA 500 | |
| 1J30.20 | tension in a string | 1J30.20 | The weight of a mass hung from a single spring scale is compared to the weight shown on a spring scale between two masses over pulleys. |
| 1J30.20 | tension in a string | Ml-1 | A spring scale is suspended between strings running over pulleys to equal weights. |
| 1J30.21 | tension in a string | TPT 9(7),387 | A clever story. |
| 1J30.22 | tension in a spring | M-10 | Two students pull against each other through one and then two spring scales. |
| 1J30.23 | tension in springs | M-8 | Masses are hung at the ends of a series of spring scales. |
| 1J30.25 | rope and three students | PIRA 200 | Two large strong students pull on the ends of a rope and a small student pushes down in the middle. |
| 1J30.25 | rope and three students | 1J30.25 | Two large strong students pull on the ends of a rope and a small student pushes down in the middle of the rope. |
| 1J30.25 | rope and three students | TPT 9(3),148 | Two football players stretch a 10 m rope while a small person pushes the middle to the floor. |
| 1J30.25 | clothesline | Disc 04-02 | Hang a 5 newton weight from a line and pull on one end of the line with a spring scale. |
| 1J30.26 | rope and three weights | PIRA 1000 | |
| 1J30.26 | rope and three weights | 1J30.26 | Suspend a rope over two pulleys with masses on the ends and hang another mass from the center. Measure the deflection. |
| 1J30.27 | deflect a rope | PIRA 1000 | |
| 1J30.27 | deflect a rope | 1J30.27 | Stretch a rope in a frame with a 100 newton scale measuring the tension. Pull down with a 20 newton scale. |
| 1J30.30 | break wire with hinge | PIRA 1000 | |
| 1J30.30 | break wire with hinge | 1J30.30 | Suspend a 5 kg mass from a length of wire. Break a length of similar wire by placing the same mass on the back of a large hinge. |
| 1J30.30 | breaking wire hinge | Mj-3 | Pushing down on a slightly bent hinge will break the wire fastened to the ends. |
| 1J30.30 | breaking wire hinge | M-16 | Press down on a hinge to break a rope. |
| 1J30.35 | pull the pendulum | M-5 | A long heavy pendulum is displaced with a spring scale. |
| 1J30.40 | horizontal boom | PIRA 1000 | |
| 1J30.40 | booms | 1J30.40 | A sprig scale measures the tension in the supporting rope at various loads and boom angles. |
| 1J30.40 | horizontal boom | Disc 04-08 | The tension in the wire is measured with a spring scale for two different boom structures. |
| 1J30.50 | blackboard force table | PIRA 500 | |
| 1J30.50 | blackboard force table | 1J30.50 | Scales and masses are hung in front of a large movable whiteboard. |
| 1J30.50 | blackboard force table | Mj-1 | A weight is hung on a string suspended between two spring scales. |
| 1J30.50 | blackboard force table | M-13 | The standard blackboard force table. |
| 1J30.50 | blackboard force table | M-11 | A mass is hung from the center of a cord attached to two spring scales. Start with the strings vertical, increase the angle. |
| 1J30.50 | blackboard force table | M-12 | A force table in the vertical plane |
| 1J30.50 | force board | Disc 04-01 | This looks like a magnetic vertical force board. A circle is marked with angles every 10 degrees. |
| 1J30.51 | vertical force table | AJP 36(6),559 | A vertical force table that permits a continuous range of angles. |
| 1J30.51 | blackboard force table | M-14 | A removable frame that sets on the chalk tray. |
| 1J30.51 | blackboard force table | M-4 | A framework for doing the force table in the vertical plane. |
| 1J30.52 | force table on overhead | AJP 41(9),1115 | A plexiglass force table for the overhead projector. |
| 1J30.52 | force table on OH proj | TPT 10(4),217 | Make a large sketch of the angles using the OH projector. |
| 1J30.53 | standard force table, etc. | M-10c | The standard force table, three dimensional force table, and torque apparatus. |
| 1J30.54 | force table | 6-4.11 | Three scales and a ring to show forces add by parallel construction. Not the usual. |
| 1J30.55 | human force table | PIRA 1000 | |
| 1J30.55 | human force table | 1J30.55 | Sit on a chair that hangs from a chain attached to load cells on each end. |
| 1J30.55 | human force table | AJP 46(7),774 | Hang from a large gallows frame on ropes attached to load cells. |
| 1J30.55 | bosun chair force table | AJP 51(6),571 | Sit on a chair suspended from two supports equipped with protractors and commercial load cells. |
| 1J30.57 | blackboard force table - rubber band | TPT 20(3),176 | Calibrate rubber bands for force vs. length, predict the mass of an object hung in a noncolinear configuration. |
| 1J30.57 | blackboard force table - rubber band | TPT 13(4),246 | A simple substitute for scales is a calibrated set of rubber bands. |
| 1J30.57 | blackboard force table - springs | M-15 | Use screen door springs in place of spring balances. |
| 1J30.60 | sail against the wind | PIRA 1000 | |
| 1J30.60 | sail against the wind | 1J30.60 | Set a mainsail on a cart so it moves toward and away from a fan. |
| 1J30.60 | sail against the wind | AJP 40(8),1172 | Use a large fan to blow at an air track glide with a sail. |
| 1J30.60 | sail against the wind | AJP 40(4),626 | A sail is mounted on an air track cart. A table fan supplies the wind. |
| 1J30.60 | sail and the wind | AJP 28(3),259 | Apparatus Drawings Project No.4: A sailboat rides in an air trough which serves as a keel. Set the angle of the sail with respect to the wind. |
| 1J30.60 | sailing upwind (airtrack) | Disc 02-10 | Use a skateboard cart with a foam core sail. |
| 1J30.61 | sail a trike against the wind | AJP 49(3),282 | A wind driven tricycle moves against the wind. |
| 1J30.64 | sail against the wind | AJP 46(10),1004 | A wind driven boat accelerates against the wind. Description and Analysis. |
| 1J30.64 | sailboat and wind | M-6 | A cork stopper boat with a keel and removable sail. |
| 1J30.65 | floating cork | Mo-9 | A stick is hung by a thread at one end with the other attached to a cork floating on water. |
| 1J30.65 | floating cork | M-29 | A stick is hung by a thread at one end with the other attached to a cork floating on water. |
| 1J30.70 | sand in a tube | PIRA 1000 | |
| 1J30.70 | sand in a tube | 1J30.70 | Place a tissue on the bottom of an open glass tube, fill with a few inches of sand, and push down on the top of the sand with a rod. |
| 1J30.70 | sand in a tube | M-7 | A couple of inches of sand held in a tube by tissue paper will support about 50 lbs. |
| 1J30.75 | stand on an egg | PIRA 1000 | |
| 1J30.75 | stand on an egg | 1J30.75 | Three eggs in a triangle pattern in foam depressions between two plates will support a person. |
| 1J30.75 | egg crusher | Disc 04-21 | A raw egg can be squeezed between two hard foam rubber pads with a force of over 150 lbs. |
| 1J30.80 | rolling wedge | M-19 | A light roller lifts a heavy weight as it rolls inside an inclined hinge. |
| 1J30.90 | inverse catenary | AJP 59(5),472 | A string of helium balloons tied at each end forms an inverse catenary. |
| 1J30.91 | catenary analog computer | AJP 40(2),354 | Model the catenary on a simple analog computer. |