PIRA Code(s): 1C20.10 Set up time:1 minute Operation: Tip the tube with penny and feather upside down. The penny will fall faster than the feather. Then, use the pump to evacuate all of the air. Like before, turn the tube upside down and the two objects will fall at the same rate. Physics and Science Concepts: Uniform Acceleration, Mechanics, Gravity Safety: Do not crack tube.
Must check out demonstration 3B30.30 to obtain and use pump.
PIRA Code(s): 1D60.10 Set up time:1 minute Operation: Press down on the inside of the cup. Turn the cart over, and stick the pin in the hole that protrudes from the bottom of the cart. Place the ball inside the cup. Then, push the car at a constant velocity as you gently pull the string. The ball should pop up and land in the cup again. Physics and Science Concepts: Mechanics, Motion in Two Dimensions, Projectile Motion Safety: None
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): 1M40.10 Set up time:5 minutes Operation: Hook the bowling ball onto the chain. Pull the bowling ball back until it reaches your nose. Release the ball and do not move. Let the ball come back and show how it will not reach your nose again. *For use in lecture room 131. Physics and Science Concepts: Mechanics, Work and Energy Safety: Do not give the ball an initial velocity or move forward once the ball is release. Warning: it’s hard not to flinch.
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): 1N30.10 Set up time:1 minute Operation: Pull back a number of balls and let them collide with the other balls, allowing the same number of balls to be released on the other side. Physics and Science Concepts: Conservation of linear momentum Safety: Align the balls for the best results. Do not allow the strings to tangle.
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): 1Q50.30 Set up time:1 minute Operation: Rotational Dynamics, Mechanics, Gyroscopic Motion Physics and Science Concepts: Rotational Dynamics, Mechanics, Gyroscopic Motion Safety: The central gyroscope is quite heavy and can pinch fingers.
PIRA Code(s): 1Q50.60 Set up time:2 minutes Operation: Use the string or turn the rotor with your thumb to start the gyroscope spinning. Take care to hold the gyroscope and metal hold in place relative to the top block of wood. Then, spin the wooden block, stop it, and reverse the direction of the spin. The gyroscope will do a spin flip. Physics and Science Concepts: Rotational dynamics, Mechanics Safety: None