Differences between revisions 5 and 7 (spanning 2 versions)

## Work and Energy

PIRA classification 1M

# 1M10. Work

 PIRA # Demonstration Name Abstract 1M10.10 shelf and block Lift a block up and set it on a shelf. 1M10.15 block on table 1M10.16 carry a block Just carry a block around. 1M10.20 pile driver Drive a nail into a block of wood with a model pile driver. 1M10.20 pile driver A model pile driver pounds a nail into wood. 1M10.20 pile driver A 10 lb block guided by side rails falls onto a nail in wood. 1M10.20 pile driver Drive a nail into a block of wood with a model pile driver. 1M10.20 pile driver Drop a weight onto a nail in wood. 1M10.25 pile driver with soda cans Smash pop cans with a pile driver. 1M10.99 work to remove tape Pull off a piece of tape stuck to the lecture bench.

# 1M20. Simple Machines

 PIRA # Demonstration Name Abstract 1M20.01 simple machines A collection of simple machines is shown. 1M20.10 pulleys An assortment of large pulleys can be rigged several ways. 1M20.10 pulleys Demonstrate what you have. 1M20.11 pulley advantage Place a mass on a string over a pulley and hold a spring scale at the other side. Repeat with a mass hanging from a single pulley in a loop of string. 1M20.11 pulley advantage Hang a 10 newton weight on a string passing over a pulley and measure the force with a spring scale, then hang the weight from a free running pulley. 1M20.13 pulleys Pedagogy. Good diagram. 1M20.15 pulley and scales Same as encyclopedia disc 04-05. 1M20.15 pulley and scales This is a counter intuitive demonstration. A frame containing a spring scale and pulley hangs from another spring scale. Look it up. 1M20.20 bosun's chair Use a single pulley to help the instructor go up. 1M20.20 bosun's chair Using a block and tackle, the lecturer ascends. Full of pedagogical hints on how to do this effectively. 1M20.20 bosun's chair The instructor "lifts himself up by the bootstraps". 1M20.25 monkey and bananas A wind up device and equal mass are placed at either ends of a string placed over a pulley. 1M20.25 monkey and bananas A yo-yo and counterweight are suspended over a pulley. The counterweight and yo-yo rise and fall together. 1M20.25 monkey and the coconut A steel yo-yo and steel counterweight suspended over two low friction bearings. 1M20.25 climbing monkey A yo-yo and a counterweight are on opposite sides on a pulley. As the yo-yo goes up and down, so does the counterweight. 1M20.25 climbing monkey A steel yo-yo on one side of a pulley and a counterweight on the other. As the yo-yo goes up and down, so does the counterweight. 1M20.26 climbing monkey Two equal masses are hung over a pulley, one of which is equipped with a cord winding mechanism. 1M20.27 windlass A model windlass is described. 1M20.28 climbing pirate String is wrapped around two different sized pulleys on a common axis. 1M20.29 fool's tackle A diagram of the "fools tackle" is shown. 1M20.30 incline plane 1M20.30 screw and wedge A long triangular piece of sailcloth is wound around a mailing tube to show the relationship between a screw and a wedge. Diagram. 1M20.35 big screw as incline plane 1M20.35 big screw A large wood screw and nut (6"-1) show the relationship between a screw and incline. 1M20.40 levers 1M20.40 levers Show the three classes of levers with a mass, bar, pivot, and spring scale. 1M20.40 levers The three classes of simple levers. 1M20.40 levers A torque bar, spring scale, and pivot are used to illustrate the three classes of levers. 1M20.45 body levers Construction and use of a device representing body levers. 1M20.60 wheel and axle The PIC-Kit used for demonstrating simple machines. 1M20.99 black box Hide a mechanism in a box and try to deduce what is inside.
• 1M20.11 [:BlockNTackle: Block and Tackle Pulley Systems and Pulley Advantage]

# 1M30. Non-Conservative Forces

 PIRA # Demonstration Name Abstract 1M30.10 air track collision/sliding mass An air cart with a mass that can be locked or free hits the end of the track. 1M30.10 air track collision/sliding mass Compare the bounce of an air cart on an inclined air track with a mass that is attached tightly and loosely. 1M30.15 neg.acceleration due to friction A pendulum hits a tabletop, transferring a wood block rider to the tabletop. Potential to kinetic energy is wasted in friction. 1M30.16 ref. friction blocks see 1K20.16. 1M30.30 the woodpecker A toy bird slides down a rod giving up energy to friction and pecking. A "loose clamp" on the ringstand demo is also shown.