PIRA |
Physics Lecture Demonstration MECHANICS (1M) - Work and Energy |
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PIRA |
Physics Lecture Demonstration MECHANICS (1M) - Work and Energy |
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1M - Work and Energy
10. Work |
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| DCS # | Demonstration | Abstract/Description |
| 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. |
| DCS # | Demonstration | Abstract/Description |
| 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 counterwieght 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. |
| DCS # | Demonstration | Abstract/Description |
| 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.accelaration 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. |
| DCS # | Demonstration | Abstract/Description |
| 1M40.10 | nose basher | A bowling ball pendulum is held against the nose and allowed to swing out and back. |
| 1M40.10 | nose basher | Hold a bowling ball suspended from the ceiling against your nose and let it swing. |
| 1M40.10 | nose basher, etc | Use bowling balls for the nose basher, drop out or project out of upper floor windows, collisions. |
| 1M40.10 | nose basher | A large pendulum bob is suspended from the ceiling. Do the nose basher. |
| 1M40.10 | nose basher | Head against the blackboard, long pendulum. |
| 1M40.10 | nose basher | Hold a bowling pendulum to the nose and let it go. |
| 1M40.10 | nose basher / bb pendulum | A bowling ball pendulum is held against the nose and allowed to swing out and back. |
| 1M40.11 | recording pendulum motion | A complicated device uses a spark timer to record interchange of kinetic and potential energy in a swinging pendulum. |
| 1M40.12 | additional references | A letter noting that AJP 35(11),1094 has been published many times. |
| 1M40.12 | weight of a pendulum | Suspend a pendulum from a double beam balance with a small block placed under the opposite pan to keep the system level. Swing the pendulum so it just lifts a weight off the stopped pan. |
| 1M40.12 | swinging on the halyards | Swinging on the halyards to hoist a sail. |
| 1M40.12 | break a pendulum wire | Suspend a heavy bob on a weak wire. As the ball descends in its swing, the wire breaks. |
| 1M40.13 | burn the pendulum wire | A Saran wrap pendulum support is burned to release the bob as it reaches the bottom of its swing. Measure the range of the bob. |
| 1M40.15 | stopped pendulum | A pendulum started at the height of a reference line reaches the same height when a stop is inserted. |
| 1M40.15 | stopped pendulum | A pendulum is started at the height of a reference line and returns to that height even when a stop is inserted. |
| 1M40.15 | stopped pendulum | A pendulum swing is started at the height of a reference line. A stop is inserted and the bob still returns to the same height. |
| 1M40.15 | Galileo's pendulum | Intercept the string of a pendulum by a post at the bottom of the swing. |
| 1M40.16 | blackboard stopped pendulum | Do the stopped pendulum on the blackboard. |
| 1M40.20 | loop the loop | A ball rools down an incline and then around a vertical circle. |
| 1M40.20 | loop the loop | A ball rolls down an incline and around a loop. Vary the initial height of the ball. |
| 1M40.20 | loop the loop | Apparatus Drawings Project No. 26: The vertical circle is made by flexing a thin stainless steel strip in a framework of plexiglass. |
| 1M40.20 | loop the loop | How to make an inexpensive loop the loop from vinyl cove molding. |
| 1M40.20 | loop the loop | A steel ball is rolled down an angle iron bent to form a incline and loop. |
| 1M40.20 | loop the loop | An apparatus to do the loop the loop quantitatively. Construction details in appendix, p.589. |
| 1M40.20 | loop the loop | A ball rolls down an incline and then around a vertical circle. |
| 1M40.20 | loop the loop | Standard loop the loop. |
| 1M40.20 | loop the loop | A rolling ball must be released at 2.7 times the radius of the loop. |
| 1M40.21 | water loop the loop | A water stream "loop the loop" demonstrates the effect of centripetal forces much more dramatically then when a ball is used. |
| 1M40.23 | reverse loop the loop | The reverse loop-the-loop is placed on a cart hooked to a falling mass that produces an acceleration just large enough to make the ball go around backwards into the cup. |
| 1M40.23 | reverse loop-the-loop | With a little practice, one can pull a reverse loop-the-loop with a large and prolonged acceleration. Plans and procedures. |
| 1M40.23 | reverse loop the loop | In the reverse loop-the-loop a ball rolls up an incline and around a loop into a cup as the whole apparatus is accelerated. |
| 1M40.24 | loop the loop with slipping analysis | Analysis of loop the loop, also dealing with slipping. |
| 1M40.25 | energy well track | A ball can escape the energy well when released from a point above the peak of the opposite side. |
| 1M40.30 | ball in a track | A ball rolls in an angle iron bent into a "v" shape. |
| 1M40.30 | ball in a trough | Roller coaster car on a track runs down one track and up another of a different slope. |
| 1M40.31 | deformed air track | Deform a 5 m air track into a parabola (1") at center and show oscillations both with the track leveled and with one end raised. |
| 1M40.31 | air track potential well | Curve an air track into an arc of a vertical circle. |
| 1M40.32 | ball in curved tracks | Balls are rolled down a series of curved tracks of the same height but different radii. |
| 1M40.33 | triple track | |
| 1M40.33 | ball in a track | A large steel ball rolls on a bent angle track with differing slopes. |
| 1M40.33 | triple track energy conservation | Balls released from three tracks with identical initial angles rise to the same height independent of the angle of the second side of the "v". |
| 1M40.35 | roller coaster | A ball rolls down a track with four horizontal sections of differing heights. The velocity is measured at each section. |
| 1M40.35 | roller coaster experiment | Optoelectrical detectors measure the speed of a ball at specific points on a roller coaster track. Could be adapted for lecture demonstration. |
| 1M40.40 | ballistic pendulum | Shoot a .22 into a block of wood mounted as a pendulum. A slider device measures recoil. |
| 1M40.40 | ballistic pendulum | A .22 is fired into a suspended wood block. The recoil distance is used to determine the rise of the block. |
| 1M40.40 | ballistic pendulum | Shoot a .22 straight up into a suspended block of wood. |
| 1M40.40 | ballistic pendulum | The standard rifle ballistic pendulum setup. |
| 1M40.40 | ballistic pendulum | Fire a air-gun into a wood block with a paraffin center. |
| 1M40.41 | modify the ballistic pendulum | Ignoring rotational dynamics results in a large error. Convert to a rotational dynamics device with an additional metal sleeve. |
| 1M40.41 | Beck ballistic pendulum | Comprehensive review of the Beck ballistic pendulum. |
| 1M40.41 | ballistic pendulum | The commercial ballistic pendulum. |
| 1M40.41 | ballistic pendulum | The commercial swinging arm ballistic pendulum. |
| 1M40.42 | ballistic pendulum | A catapult/ballistic pendulum made of inexpensive materials. |
| 1M40.43 | bow and arrow ballistic pendulum | The relation between bending of the bow and the velocity of the arrow was found to be linear. |
| 1M40.43 | bow and arrow ballistic pendulum | Plans for a coffee can target for a bow and arrow ballistic pendulum. Includes slider. |
| 1M40.45 | blow gun ballistic pendulum | Find the velocity of the dart fired from a blowgun by measuring the fall from the aiming point to the hit point on the target block. |
| 1M40.47 | vertical ballistic pendulum | A ball is dropped into a box of sand suspended from a spring and the extension of the spring is measured. |
| 1M40.49 | trouble with the ballistic pendulum | An analysis of the error introduced with non-parallel ropes. |
| 1M40.49 | ballistic pendulum tutorial | Good tutorial on the ballistic pendulum. |
| 1M40.50 | big yo-yo | A large disc is hung from bifilar threads wrapped around a small axle. |
| 1M40.50 | big yo-yo | A shop drawing of axles with three different radii used to make a big yo-yo out of a force table. |
| 1M40.50 | big yo-yo | A large (2') disc is suspended from a small axle so the string unwinds on the way down and rewinds on the way up. |
| 1M40.50 | big yo-yo | Two large discs hung from bifilar thread wrapped around a small axle. |
| 1M40.50 | big yo-yo | A large yo-yo is made by suspending a large spool from two threads wrapped around opposite ends of the axle. |
| 1M40.50 | big yo-yo | A picture of a commercial Maxwell's wheel. |
| 1M40.50 | Maxwell's yoyo | Release a large yo-yo and it will bottom out and wind up again. |
| 1M40.51 | cheap and simple yo-yos | Yo-yos made with cardboard sides and paper towel centers routinely gave time of fall within 1% of predicted |
| 1M40.55 | swinging arm | A ball is dropped into a pivoting capturing arm from the height required to make it just complete one revolution. |
| 1M40.56 | spinner and pendulum | A ball suspended as a bifilar pendulum hits a ball of equal mass free to rotate in a horizontal circle. |
| 1M40.57 | Pany device | A complicated apparatus converts elastic potential energy (spring) into rotational potential energy and back. |
| 1M40.60 | height of a ball | Rotate a 15.3 in radius bar at 1, 2, or 3 rev/sec, a mechanism releases a ball at the end of the bar at the moment the ball is traveling vertically. The ball rises 1, 4, or 9 ft. |
| 1M40.60 | height of a ball | A device to project a ball upward at different known velocities to show dependence of kinetic energy on the square of velocity. |
| 1M40.61 | 1-D trampoline | A horizontal string passes over a pulley down to a spring fixed at one end. Place a spitball at the center of the horizontal section and pull it down until the spring extends unit lengths. Compare the heights the spitball reaches. |
| 1M40.63 | x-squared spring energy dependence | Measure the height of recoil on an air cart glider on an incline after compressing a spring different to different lengths. |
| 1M40.64 | spring pong gun | A spring gun shoots standard and loaded ping pong ball to different heights. |
| 1M40.65 | height of a spring-launched ball | A 3/4" steel ball is launched upward by a "stopped spring" (shown), from which the initial velocity is calculated. |
| 1M40.66 | mechanical jumping bean | Same as TPT 1(3),108. |
| 1M40.66 | mechanical jumping bean | A mailing tube jumps when a hidden mass moves upward under rubber band power. |
| 1M40.66 | jumping tube | A spring loaded tube jumps two or three times its own height when triggered. Diagram. |
| 1M40.67 | spring jumper | Compress a spring under a toy held down be a suction cup. |
| 1M40.68 | muzzle velocity - spring constant | A method of using the potential energy of the cocked spring to calculate the muzzle velocity. (15% of the energy is lost.) |
| 1M40.69 | rachet for inelastic collisions | A ratchet mechanism locks a spring in the compressed position giving an inelastic collision with the decrease in kinetic energy stored for later release by tripping the ratchet. |
| 1M40.71 | dropping bar | Lift a horizontal bar suspended from two springs and drop it through a photocell to measure velocity. Examine the exchange between gravitational, elastic potential, and kinetic energy. |
| 1M40.72 | tension in wire when one mass swings | A spring scale is suspended between two masses. Set one swinging- a lot of physics. |
| 1M40.74 | air track cart and falling mass | A mass m attached to a cart M with a string and pulley. Compare kinetic energy gained by m+M with potential energy lost by M. |
| 1M40.76 | air disc | A falling weight spins an air bearing supported rotating disc. Compare rotational (disc) and translational (weight) kinetic energy with potential energy. |
| 1M40.80 | push-me-pull-you sternwheeler | Both upstream and downstream motion is possible in a system with a water stream running between the rails and a waterwheel mounted on the rear axle of the cart. |
| 1M40.85 | sloping cart | This is a counter intuitive demo. Nothing happens when a brick is placed on a slanted cart. |
| 1M40.91 | high bounce paradox | Flip a half handball inside out and drop on the floor. It bounces back higher than the height from which it was dropped. |
| DCS # | Demonstration | Abstract/Description |
| 1M50.10 | Prony brake | Turn a large hand cranked pulley with the belt fastened to two spring scales. |
| 1M50.10 | Prony brake | A belt fastened to two spring scales is strung under tension around a large hand cranked pulley. |
| 1M50.10 | Prony brake | How to make a self adjusting Prony brake that provides constant torque. |
| 1M50.10 | Prony brake | Each end of the belt for a Prony brake is attached to a spring scale. |
| 1M50.10 | Prony brake | Measuring your horsepower by Prony brake and running up stairs. Hints on making a human sized Prony brake. |
| 1M50.10 | Prony brake | Measuring delivered horsepower by turning a pulley under a stationary belt attached to spring scales at each end. |
| 1M50.10 | Prony brake | Rotate a shaft against a constant frictional resistive force. |
| 1M50.20 | power bicycle | Attach a 2" dia. axle to the rear of a bike and use it to lift a weight via a pulley on the ceiling. |
| 1M50.30 | ref. hand crank generator | see 5K40.80. |
| 1M50.50 | rocket wheel | Two rockets are mounted on the rim of a bike wheel. The second is fired after effect of the first has been measured showing the power developed by a rocket is a function of its velocity |