PIRA |
Physics Lecture Demonstration MECHANICS (1F) - Newton's First Law |
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PIRA |
Physics Lecture Demonstration MECHANICS (1F) - Newton's First Law |
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1F - Newton's First Law
10. Measuring Inertia |
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| DCS # | Demonstration | Abstract/Description |
| 1F10.10 | inertia balance | A torsion pendulum has cups that can be loaded with various masses. |
| 1F10.10 | inertia balance | A light torsion pendulum can be loaded with various masses. |
| 1F10.10 | inertia balance | Torsion pendulum as an inertia balance. |
| 1F10.11 | inertia balance | A horizontal leaf spring as an inertial balance. |
| 1F10.11 | inertia balance | Place masses on a platform supported by horizontal leaf springs. |
| 1F10.12 | inertia oscillation | A puck between two springs rolling on Dylite beads is timed with several different masses. |
| 1F10.13 | inertial equal arm balance | Publication of an unfinished demonstration, but up front about it. Shows circuit diagram for a indicator for a horizontal Roberval type balance on an acceleration cart. |
| 1F10.13 | inertia balance | Measure the period of a commercially available (?) inertia balance by using a stroboscope. |
| 1F10.20 | inertia bongs | Hit hanging 2"x4"x10" blocks of wood and steel with a hammer. |
| 1F10.20 | inertia bongs | Two large cylinders are suspended, one wood (3Kg) and one iron (50Kg). Students compare displacements when struck by a hammer or just push the things around. |
| 1F10.25 | foam rocks | Hit a real rock (granite) then a foam rock (looks like granite) with a hammer. Throw a form rock at some students. |
| 1F10.25 | foam rock | Hit a real rock and then a foam rock with a heavy mallet. |
| 1F10.30 | judging inertial mass | A blindfolded volunteer compares a mass on a string with a mass on a roller cart. |
| DCS # | Demonstration | Abstract/Description |
| 1F20.10 | inertia balls | Break the string on the top or bottom of a suspended mass. |
| 1F20.10 | inertia balls | Two heavy iron balls are hung separately between lengths of string. Pull on one and jerk on the other. |
| 1F20.10 | inertia balls | Two steel balls are suspended by strings with identical strings tied from their bottoms. Give a quick jerk to one and pull the other slowly. |
| 1F20.10 | inertial balls | Break the string on the top or bottom of a suspended mass. |
| 1F20.10 | inertia ball | A mass is suspended between two cords. Pull slowly or jerk on the lower cord. |
| 1F20.11 | bowling ball inertia balls | Replace the standard 6 cm balls with bowling balls for increased visibility. |
| 1F20.12 | inertia balls | One mass is hung from a string and another mass hung below it. Jerk the lower mass to break one of the strings. |
| 1F20.13 | inertia stick | A long stick is supported from rings of filter paper at each end. Break the filter paper with a pull or the stick with a jerk. |
| 1F20.15 | inertia block | A 50 lb mass is mounted on rollers. A thread will pull it but a rope can be broken with a jerk. |
| 1F20.16 | inertia block | Tie a loop of 7/16" braided cotton cord through a hole in a 2"x4"x10" steel block. Pull and jerk with a hammer. |
| 1F20.16 | inertia block | A length of rope is tied to a 10 lb. block. A pull with a hammer will move the block but a jerk will break the rope. |
| 1F20.16 | inertia block | A rope is attached between a heavy iron ball and a hammer head. A fast swing of the hammer takes up the slack and breaks the rope without moving the ball. |
| 1F20.18 | inertia balls - analysis | For the more advanced reader. The system may be treated as a forced harmonic oscillator and the classical results of the demonstration are verified analytically. Surprises emerge. |
| 1F20.20 | smash your hand | Place a lead block on your hand and hit it with a hammer. |
| 1F20.20 | smash your hand | Hit a 10 lb. brick with a hammer while it rests on your hand. |
| 1F20.21 | smash your hand, etc. | Hit a 10 lb block on the hand or a 50 lb brick on the stomach with a hammer. Pound nails into a 50-75 lb wood block placed on a student's head. |
| 1F20.22 | hit the nail on the head | Place a physics book, then a 6"x6" block of wood on a student's head and drive a nail into the block. |
| 1F20.22 | hit the nail on the "head" | Drive a nail into a large block of wood placed on a student's head. |
| 1F20.25 | smash the block | An analysis of smashing a block on a volunteer sandwiched between two nail beds. Safety issues are discussed. |
| 1F20.25 | smash the block | A bed of nails is placed on the chest before smashing the block with a sledge. |
| 1F20.26 | vibrograph | An optical lever arrangement for magnifying small displacements of a large mass when the table is hit with a hammer. |
| 1F20.30 | the tablecloth pull | Pictures and a few hints. |
| 1F20.30 | tablecloth pull | Pull the tablecloth out from under a place setting. |
| 1F20.30 | tablecloth pull | Pull a low friction tablecloth from under a place setting. |
| 1F20.33 | inertia cylinder | Stand a 3/4" x 6" aluminum cylinder on a sheet of paper. Jerk the paper out from under the cylinder. |
| 1F20.33 | inertia cylinder | Jerk a sheet of paper out from under a thin steel cylinder. |
| 1F20.34 | card/coin snap | Snap a card out from under a tall object, e.g., a shipping tag from under a balanced claw hammer. |
| 1F20.34 | card/coin snap | Several inertia tricks. |
| 1F20.34 | card/coin snap | Snap a piece of cardboard from under a steel ball. |
| 1F20.35 | eggs and pizza pan | Set a pizza pan on three 2l beakers full of water, stand paper cylinders with eggs at the tops above the beakers, knock out the pizza pan. |
| 1F20.35 | blocks and broomstick | Egg on a spool, on a pie tin, on a beaker of water. Flex broom and knock out pie tin. |
| 1F20.35 | eggs and pizza pan | Place a pizza pan on three beakers, place cardboard tubes on the pan directly above the beakers, and eggs on the tubes. Knock out the pizza pan. |
| 1F20.40 | stick on wine glasses | Stick needles in the ends of a 3/4" sq x 4' clear pine bar. Place the needles on wine glasses full of water and break the stick with an iron bar. |
| 1F20.50 | shifted air track inertia | Support an air track on wheels. Move the air track under an air glider. |
| 1F20.50 | shifted air track inertia | Move the air track under an air track glider. |
| 1F20.60 | loose hammer head | A hammer handle may be tightened by pounding on the far end of the handle. |
| 1F20.61 | inertia cart | A cart has a pivoting arm with different masses but the same volume at the ends. The greater mass lags behind as the cart is accelerated. |
| 1F20.62 | string of weights | A string of weights connected by springs shows uneven deformation when jerked. |
| 1F20.64 | inertia of liquids | There are two horizontal glass tubes, one with a cork cylinder and the other with a lead cylinder. Strike the stopper at one end of the glass tubes with a hammer and watch the direction of the cylinders. |
| DCS # | Demonstration | Abstract/Description |
| 1F30.10 | persistence of motion (air track) | A single cart on the air track. |
| 1F30.10 | persistence of motion (air track) | A single cart on the air track. |
| 1F30.11 | air table puck | Air table with a puck. |
| 1F30.13 | CO2 block | A large piece of dry ice on a flat formica top wetted with alcohol. |
| 1F30.21 | water hammer | Some water in an evacuated test tube clicks when the water hits the end of the tube. |
| 1F30.21 | water hammer | Shut off the sink faucet and a water hammer may be heard. A small tube evacuated with some water shows the effect nicely. |
| 1F30.21 | water hammer | A tube is evacuated except for some water. When the tube is stopped suddenly, the water strikes the end of the tube with a click. |
| 1F30.21 | water hammer | Evacuate a glass tube containing water. |
| 1F30.30 | car on cart on cart | A small car on a skateboard on a large roller cart hits a stop level with the roller cart and the skateboard and car continue to move at constant velocity. |
| 1F30.30 | cart on a cart | A smaller roller cart is placed on a larger one. when the larger is stopped, the smaller continues. |
| 1F30.40 | nail by hand | Follow the directions in TPT 18(1),50. |
| 1F30.40 | hand pile driver | Drive a nail into wood with your bare hands. |
| 1F30.50 | pencil and plywood | Place a pencil in a brass tube hooked to a fire extinguisher. Fire the pencil into a 1/2" plywood board. |
| 1F30.50 | pencil and plywood | Use a CO2 extinguisher to fire a pencil through a 1/2" plywood. |