## Applications of Newton's Laws

PIRA classification 1K

34 Demonstrations listed of which 20 are grayed out

 Grayed out demonstrations are not available or within our archive and are under consideration to be added.

# 1K20. Friction

 PIRA # Demonstration Name Subsets Abstract 1K20.05 Washboard Friction Model Two plants with a zig-zag pattern cut in the faces. Slide them past each other. 1K20.10 Friction Blocks pira200 Pull blocks with different surfaces across the lecture bench with a spring scale. 1K20.13 Sliding Friction Machine A spring scale is attached to an object on a rotating table. See AJP 33(2),161. 1K20.15 Weight Dependence of Friction Pull a friction block with a spring scale, place a second block of equal weight on top of the first and repeat. 1K20.16 Sliding Block 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. 1K20.20 Area Dependence of Friction A friction block is slid across the table with a spring scale measuring the friction force. One side has a an area ten times larger than the other, shaped like a plank with two small blocks attached to one face. See Sutton M-49. 1K20.20 Area Dependence of Friction A 2X12 is pulled along the bench top while resting on either the narrow or wide face. 1K20.25 Phone Book Friction 1K20.30 pira200 A spring scale attached to a block is used to pull on the block until it begins to move. The force registering on the scale is largest just before the block begins to move demonstrating that static friction is greater than kinetic friction. 1K20.35 An inclined plane is raised until a block starts to slide. 1K20.36 A weighted wood block is placed on an inclined plane with upward tension provided by a counterweight attached by a string running over a pulley. The tension is just enough to balance the weight so that the force due to static friction is just enough to prevent slipping. A nudge then triggers the block to slide. 1K20.37 Tire Friction The automobile tire is a misleading example of static and sliding friction. See AJP 46(8),858. 1K20.40 Stability and Breaking of Cars A toy car slides down an incline with either front or rear wheels locked. 1K20.42 Friction Roller A cylindrical roller is pulled or slid across the lecture bench with a spring scale. 1K20.60 Sliding Chain Hang a chain over the edge of the table until the weight of the chain makes it slide. 1K20.70 Falling Flask Capstan Attach a 4 liter r.b. flask at one end of a sting, attach a ball to the other end and drape the flask over a horizontal rod 4' high. Let go of the ball. 1K20.74 Friction Pendulum A ball is suspended by a loop of string over a slowly turning horizontal wooden bar. A large amplitude results. See Sutton M-54. 1K20.76 Tree Climbing A string is looped down through a tube, which is attached to a board, and around a nail which is not, and back up through another tube, which is attached to the same board. Pulling the ends of the string up and down results in the entire apparatus climbing up the string. 1K20.90 Air Track Friction Show there is little friction on an air track.

# 1K30. Pressure

 PIRA # Demonstration Name Subsets Abstract 1K30.10 A 2′ by 4.5′ bed of nails is made up of 80d nails placed in a 1" grid. The bed contains 1375 aluminum nails which have been leveled and dulled. A second bed of nails (1.5′ x 2.5′) made up of 425 aluminum nails placed in a 1" grid can be placed on top of the person lying on the larger bed of nails. For extra excitement, break a cinder block that is placed, centered and stable, on top of the small bed of nails. 1K30.20 Pop the Balloon A balloon can be pressed into varying densities of nails by varying amounts of weight.

fw: AppNewtonsLaws (last edited 2018-07-18 16:53:21 by srnarf)