| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 1K20.00 | Friction | | |
| 1K20.05 | washboard friction model | PIRA 1000 | |
| 1K20.05 | washboard friction model | 1K20.05 | |
| 1K20.10 | friction blocks - surface material | PIRA 200 | Pull a block with four different surfaces with a spring scale. |
| 1K20.10 | friction blocks - surface material | 1K20.10 | A set of blocks with different surfaces are pulled with a spring scale. |
| 1K20.10 | friction blocks | Mk-1 | Pull blocks across the lecture bench with a spring scale. |
| 1K20.10 | surface dependence of friction | Disc 03-05 | Place brass blocks on an incline with four surfaces: teflon, wood, sandpaper, and rubber. |
| 1K20.12 | friction blocks | 8-4.9 | Several ways to move a surface under a fixed block. |
| 1K20.13 | sliding friction machine | AJP 33(2),161 | A spring scale is attached to an object on a rotating table. |
| 1K20.13 | friction blocks | TPT 14(6),373 | A device includes both sliding surface and mounted spring scale. |
| 1K20.13 | friction blocks | TPT 12(6),367 | A block is constructed with an built-in apparatus to measure coefficient of friction directly. |
| 1K20.13 | friction blocks | 8-4.11 | An apparatus pulls a block at a constant speed and measures the frictional force. Details in appendix, p.550. |
| 1K20.13 | friction blocks | 8-4.10 | A block rests on a turntable and the string goes to a dynamometer. |
| 1K20.15 | weight dependence of friction | PIRA 500 | |
| 1K20.15 | weight dependence of friction | 1K20.15 | Pull a friction block with a spring scale, add a second equal block to the first and repeat. |
| 1K20.15 | weight dependence of friction | Disc 03-04 | Add mass to a board pulled along the table with a spring scale. |
| 1K20.16 | friction blocks | TPT 18(8),559 | A loaded cart rolls down an incline and hits a barrier. The load continues sliding on a second incline until it stops. The mass on the slider is varied to show stopping distance independent of mass. |
| 1K20.17 | friction blocks | TPT 11(8),453 | Two additional points relating to Geoffery Fox's "Stumpers" column TPT. 11, 288 (1973). |
| 1K20.20 | area dependence of friction | PIRA 500 | |
| 1K20.20 | area dependence of friction | 1K20.20 | A friction block has a rectangular shape with one side twice as big as the other. One of the smaller sides is routed out to 1/5 the area. |
| 1K20.20 | friction blocks | M-49 | Friction independent of area of contact - cut a block to form a prism whose cross section is an irregular polygon. |
| 1K20.20 | area dependence of friction | Disc 03-03 | A 2X12 is pulled along the bench top while resting on either the narrow or wide face. |
| 1K20.30 | static vs. sliding friction | PIRA 200 | Use a spring scale and block to show that static friction is greater than sliding friction . |
| 1K20.30 | static vs. sliding friction | Disc 03-02 | Show that static friction is greater than sliding friction with a spring scale and block. |
| 1K20.35 | angle of repose | PIRA 500 | |
| 1K20.35 | angle of repose | 1K20.35 | An incline plane is lifted until a block begins to slide. |
| 1K20.35 | angle of repose | TPT 17(9),593 | Using the familiar suspended incline block apparatus to examine normal and frictional forces in sliding up and down the plane. |
| 1K20.35 | angle of repose | Mk-4 | An inclined plane is raised until a block starts to slide. |
| 1K20.37 | tire friction | AJP 46(8),858 | The automobile tire is a misleading example of static and sliding friction. |
| 1K20.37 | tire skid equation | AJP 48(3),253 | Motivated by being an expert witness, An approximate expression for sliding friction coefficient as a function of speed was developed from published tables. |
| 1K20.37 | angle of repose | 8-4.3 | A plastic small parts drawer on a sanded aluminum surface allows weight to be added easily. |
| 1K20.37 | angle of repose | M-11a | Using the incline plane for various friction demos. |
| 1K20.38 | how dry friction really behaves | AJP 53(9),910 | A note arguing that the main rules of thumb about friction are wrong and the less said about friction the better. |
| 1K20.38 | angle of repose | 8-4.8 | A tribometer with a meter stick mounted vertically 1 m from the hinge gives a reading of coefficient of friction directly. |
| 1K20.39 | angle of repose | 8-4.4 | Glass - glass angle of repose with oil and oil/water. |
| 1K20.39 | angle of repose | M-48 | The standard inclined plane and blocks + an interesting towel on a glass tube demo. |
| 1K20.40 | front and rear brakes | PIRA 500 | |
| 1K20.40 | front and rear brakes | 1K20.40 | A model car is rolled down an incline with either front or rear brakes locked. |
| 1K20.40 | front and rear brakes | TPT 28(8),522 | Construction details for a model car in which pulling a pin applies front, rear, or both sets of brakes to a car rolling down an incline. |
| 1K20.40 | front and rear brakes | Mk-3 | A car slides down an incline with either front or rear wheels locked. |
| 1K20.40 | front and rear brakes | 8-4.7 | A car rolls down an incline with either front or rear wheels locked. |
| 1K20.40 | front and rear brakes | M-53 | A toy car is modified so either the front or rear brakes can be locked. Slide down the incline plane for each case. |
| 1K20.40 | stability of rolling car | Disc 03-06 | A toy car slides down an incline with either front or rear wheels locked. |
| 1K20.42 | friction roller | PIRA 1000 | |
| 1K20.42 | friction roller | 1K20.36 | A cylinder in a yoke can be rolled or locked and slid as it is pulled by a spring scale. |
| 1K20.42 | friction roller | Mk-2 | A cylindrical roller is pulled or slid across the lecture bench with a spring scale. |
| 1K20.42 | friction roller | 8-4.5 | A cylinder is pulled along and perpendicular to its axis by a yoke with a spring scale. |
| 1K20.45 | frictional force rotator | PIRA 1000 | |
| 1K20.45 | frictional force rotator | 1K20.45 | |
| 1K20.45 | frictional force rotator | AJP 50(7),631 | This article shows how to rotate a friction vector to make its component in a given direction as small as desired. Everyday unconscious applications of this method are presented along with some new demonstration equipment. |
| 1K20.46 | cross friction | AJP 51(9),804 | Push a block across the slope of an incline and the block will move with a straight line trajectory. Knock a coin across and it will move in a curved path but all stopping points will be in a straight line. |
| 1K20.55 | squeaky chalk | TPT 3(1),23 | You don't have to break chalk to eliminate squeaking, only understand friction and hold the chalk accordingly. |
| 1K20.55 | angle of friction with pencil | M-51 | Tilt a pencil until it slides along the table. |
| 1K20.60 | sliding chain | 8-4.6 | Hang a chain over the edge of the table until the weight of the chain makes it slide. |
| 1K20.70 | falling flask capstan | PIRA 1000 | |
| 1K20.70 | falling flask capstan | 1K20.70 | Attach a 4 liter r.b. flask at the other end of a ball on a string and drape the flask over a horizontal rod 4' high. Let go of the ball. |
| 1K20.70 | falling keys capstan | AJP 59(10),951 | A short analysis of the falling key capstan. |
| 1K20.70 | falling keys capstan | TPT 28(6),390 | Hang a set of keys from a string draped over a pencil and when the string is released, the keys don't hit the floor. |
| 1K20.71 | discussion of the capstan | AJP 59(1),80 | Friction experiments with the cord wrapped around a cylinder. Discussion of the donkey engine and capstan with a digression on sea chanties. |
| 1K20.71 | capstan on a force table | AJP 49(11),1080 | Tap a hole in the center of a force table and insert a bolt to use as a capstan. |
| 1K20.71 | capstan | TPT 14(7),432 | Theory of the capstan along with discussion of applications. |
| 1K20.71 | capstan | M-52 | Show the frictional force vs. the number of turns around a rod. |
| 1K20.74 | friction pendulum | M-54 | A ball is suspended by a loop of string over a slowly turning horizontal wooden bar. A large amplitude results. |
| 1K20.76 | going up a tree | TPT 17(6),386 | Very clever device. Look it up as its hard to describe. |
| 1K20.80 | Snoek effect | 8-4.12 | If you don't know about the Snoek effect, don't ask me - I had to read up on it too. |
| 1K20.85 | WWII torpedo story | AJP 37(6),665 | Friction caused dud torpedo in WWII. |
| 1K20.90 | air track friction | PIRA 1000 | |
| 1K20.90 | air track friction | Disc 03-01 | Show there is little friction on an air track. |
| 1K20.95 | teflon cookie sheet | TPT 11(6),362 | Cut up a teflon coated cookie sheet for an inexpensive teflon surface. |
| 1K20.95 | teflon pulley | 8-4.1 | Teflon sheet bent around corner replaces a pulley. |
| 1K20.95 | Dylite beads | 8-4.2 | Dylite beads on a rimmed glass surface (window pane) provide a low friction surface. |