PIRA Code(s): 1D60.20 Set up time:5 minutes Operation: Mount apparatus to ring stand using clamp, adjust until apparatus is horizontal, cock the apparatus spring, and place the masses (one at the end of the apparatus and one on the bar that extends from the apparatus), release, and one ball will fall from rest (hung on the rod) while the other ball is struck by the rod and has an initial horizontal velocity. The balls should hit the table at the same time, which can be heard clearly by students. Repeat by cocking spring to different compression. Repeat by clamping apparatus at a different height to show that height has no effect on the simultaneity of the fall. Physics and Science Concepts: Projectile Motion Safety: Once spring is compressed, do not put hands in front of the end of the rod.
PIRA Code(s): 1M20.10 Set up time:none Operation: These may be used by themselves or with other demonstrations. Physics and Science Concepts: Mechanics, Mechanical Advantage, Simple Machines Safety: None
PIRA Code(s): 1M20.30 Set up time:5 minutes Operation: Set the empty friction box on the incline with weights attached to the string on the other side of the pulley so that the box slides forward. Then, gradually increase the angle of the plane until the box and the weights reach equilibrium. Physics and Science Concepts: Equilibrium of forces, Mechanics, Work and Energy Safety: None
PIRA Code(s): 1M40.20 Set up time:none Operation: Place ball at the top of track and let it fall. To show students the minimum height required to loop the loop, place the ball on the track at a height that is about double the height of the loop. Physics and Science Concepts: Mechanics, Work and Energy, Conservation of Energy, Centripetal Force Safety: Do not stand where the ball exits the track.
PIRA Code(s): 1Q40.23 Set up time:1 minute Operation: Place the shaft of the device into the hole and tighten the screw. Then, plug in the motor and turn on the red switch. When spun, the hoops will show oblation, the balls on the governor will move outwards, and the liquid in the glass sphere will move to the edge of the sphere. Physics and Science Concepts: Rotational Dynamics, Centrifugal Force, Oblation Safety: Wear goggles when running the apparatus and keep hands away from the belt.
PIRA Code(s): 1Q40.30, 1Q50.24 Set up time:3 minutes Operation: Stand on the stool as it remains still. Have someone start the motor and place the bicycle wheel next to it to get it to start spinning. Take the spinning wheel in your hands and turn the wheel in a horizontal position and you should spin. When the wheel is placed vertical again, you will spin the opposite direction.
Use the motor to start the wheel spinning. Hold on to the cord attached to the axle and the wheel will remain vertical. Physics and Science Concepts: Mechanics, Rotational Dynamics Safety: Do not get items caught in the motor or the spokes of the tire. Hold wheel out from the body as far as possible
PIRA Code(s): 1Q40.40 Set up time:5 minutes Operation: Place the train on the track. Plug the track into the variac and start the train by moving the dial. Physics and Science Concepts: Mechanics, Angular Momentum, Rotational Dynamics, Angular Momentum, Relative Motion Safety: Watch for sparks from the train. Maintain a cautious distance from the wheel.
PIRA Code(s): 1Q40.42 Set up time:1 minute Operation: Instructions included in box. Must obtain ring stand and clamp from 9C40.71 and 9C40.72, respectively. A known weight attached to a string around the wheel torques the wheel a constant amount. Physics and Science Concepts: Moment of Inertia, Mechanics Safety: Use caution around spinning wheel.
PIRA Code(s): 1Q40.80 Set up time:5 minutes Operation: Partially fill flask with water. Attach flask by string to ring stand. Then, use a Bunsen burner or a torch to heat the flask. The flask should rotate as the steam emerges from the arm. Physics and Science Concepts: Rotational Dynamics, Conservation of Angular Momentum, Safety: Use caution around Bunsen burner or torch. Do not overheat the glass as it may shatter. Eye protection should be worn. The torch can be acquired from the machine shop if necessary.
PIRA Code(s): 4A30.20 Set up time:2 minutes Operation: Try putting the ring around the ball. At room temperature the ring is slightly larger than the ball. Heat the ball over a Bunsen burner and it will no longer fit through the ring. Physics and Science Concepts: Thermodynamics, Thermal Properties of Matter, Thermal Expansion Safety: Use caution when using a Bunsen burner. The Bunsen burner is not included in the experiment.
PIRA Code(s): 5A20.20 Set up time:1 minute Operation: Charge the rod by rubbing it the through the cloth provide or on your shirt. Hold the rod near a pith ball. The two balls will repel each other. The PVC gives a positive charge and the acrylic rod gives negative charge. Physics and Science Concepts: Electrostatics, Coulomb’s Law Safety: None
PIRA Code(s): 5B30.20 Set up time:5 minutes Operation: Use the Van der Graaf or Wimshurst generator to charge the ovoid. Touch a proof plane to the pointed end of the ovoid and another to the spherical end. Place the proof planes on the electroscope plate. The deflection will be greater from the proof plane that touched the pointed end. Physics and Science Concepts: Electrostatics, Surface Charge Density Safety: Electroscope can be obtained from demonstration number 5A22.22.
PIRA Code(s): 5C10.20 Set up time:none Operation: Charge the plates using the Van de Graaff. Disconnect wire going from top of sphere to fixed plate at plate end. Change the spacing of a charged parallel plate capacitor while it is attached to an electroscope. Observe changes in electroscope pointer. Physics and Science Concepts: Capacitance Safety: Electroscope can be obtained from demo 5A22.22. The Van de Graaff can be obtained from demo 5A50.30.
PIRA Code(s): 5E40.20 Set up time:1 minute Operation: Pour sulfuric acid into the glass container. Wait 5 minutes for the reaction to take place between the dissimilar metals. Place the voltmeter on the overhead and display the voltage generated in the cell. Physics and Science Concepts: Electromotive Force and Current Safety: Be careful around acid. Gloves and goggles should be worn when handling acid.
PIRA Code(s): 5K10.20 Set up time:1 minute Operation: Hook the leads from the galvanometer to the induction coil. Place a magnet in front of the coil. Turn the crank and the needle on the galvanometer should move. The connection between the galvanometer and the loop changes polarity every half turn. Physics and Science Concepts: Electromagnetic Induction, Electricity and Magnetism Safety: Magnet is extremely strong so do not place metal objects near it.