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||1C10.20||Constant Velocity - PASCO Dynamic Cart||Show the PASCO cart moving on the PASCO track.|| ||1C10.20||[:ConstantVelocityPASCO:Constant Velocity - PASCO Dynamic Cart||A PASCO cart moves on the PASCO track with constant velocity.||

[:PiraScheme#Mechanics: Table of Mechanics]

[:Measurement: Mechanics (1A): Measurement]

[:MotionIn2D: Mechanics (1D): Motion in Two Dimensions]

[:Demonstrations:Lecture Demonstrations]

Motion in One Dimension

PIRA classification 1C

22 Demonstrations listed of which 6 are grayed out.

Grayed out demonstrations are not available or within our archive and are under consideration to be added.

1C10. Velocity


Demonstration Name



Bulldozer or Cart on Moving Sheet

The bulldozer or cart moves in the same or opposite direction as the sheet which moves beneath it, to show addition and subtraction of velocities.


[:ConstantVelocityPASCO:Constant Velocity - PASCO Dynamic Cart

A PASCO cart moves on the PASCO track with constant velocity.


Block of Wood on a String

With a stopwatch, measure the time it takes to pull it  across the table at constant velocity in front of a meter stick.


Constant Velocity (Air Track & Glider)

Dots are superimposed on the screen every half second to mark the position of the air glider.


Velocity Air Track and Glider

Use a level air track, the PASCO echo system and a computer to show several velocities. 


Approaching Instantaneous Velocity

An air cart is given a reproducible velocity by a solenoid kicker. Flags of decreasing length interrupt a photo timer.


Strobed Disc

Look at a fluorescent spot on a 1725rpm disc with a stroboscope at multiples of the frequency to demonstrate the limiting process.

2C30.50 1C10.51

[:GlycerinViscosity:Terminal Velocity With Water, Glycerin, & Marbles]

Two identical marbles are dropped simultaneously into separate graduated cylinders, one filled with glycerine and the other with water. The marble dropped in glycerine will quickly reach terminal velocity, obtaining a slow and constant velocity that can be measured.


1C20. Uniform Acceleration


Demonstration Name



[:PennyCotton:Penny and Cotton] (AKA Guinea and Feather)

Invert a large glass tube that contains a penny and a small cotton ball. Invert first with air and again when evacuated.


Drop Wooden and Lead Balls

Show that the two balls, one substantially heavier than the other, when dropped simultaneously have the same acceleration and hit the ground at the same time. The two balls are the same size.


[:BallPaperCottonBallDrop: Ball, Paper, and Cotton Ball Drop]

A rubber ball, a cotton ball, a sheet of paper, and a crumpled sheet of paper are simultaneously dropped from the same height. Due to the different geometric profiles of each dropped object, the drag force on each will be different.


Equal Time & Equal Distance

Two separate ropes strung through tennis balls are hung from the ceiling. On the first rope the tennis balls are spaced equidistantly (ex. every 3 feet). On the second rope the balls are spaced in a manner which represents the position of a falling ball at equal time intervals. (ex. every half second i.e. one ball at the top, one ball 4 ft below it, another 16 ft from the top, another 36 ft from the top, etc.) See [http://physicslearning.colorado.edu/PIRA/Sutton/PARTI.pdf#pagemode=none&page=1 Sutton M-84].


Inclined Air Track

Using the PASCO interface, the echo censor and a computer to show the acceleration, velocity, or displacement graphs vs. time. The data is obtained from a cart on an inclined air track as it accelerates down and rebounds. (PASCO mass cars and track can also be used here.)


[:AlInclinedPlaneAcc:Aluminum Inclined Plane, Acceleration]

A large steel ball accelerates down the inclined track as a metronome ticks at constant time intervals.


[:AlInclinedPlaneCV:Aluminum Inclined Plane, Constant Velocity]

A large steel ball accelerates down the inclined track and onto a flat track as a metronome ticks at constant time intervals.


Duff's Plane

A ball leaves a trail as it oscillates back and forth while rolling down a chalk covered trough. See [http://physicslearning.colorado.edu/PIRA/Sutton/PARTI.pdf#pagemode=none&page=1 Sutton M-76].


Vertical Projectile Launcher

A projectile is launched vertically from a risen platform relative to the ground. The projectile will reach a maximum height, stop, then fall the the ground reaching its greatest speed just before impact.


1C30. Measuring g


Demonstration Name



Free Fall Timer

Drop a ball and time the fall.


Dropping Balls

A ball is released by an electromagnet and a clock started. The catcher stops the clock, thus measuring the duration of the fall.


Free Fall Spark Apparatus

A bob falls along a length spark tape to show the position of the bob at constant time intervals.


Video Strobe Water Drop Gravitometer

Use the 60 Hz refresh rate of a video monitor to strobe falling drops by adjusting the rate to 60 Hz and having the stream fall past the screen. See [http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=PHTEAH000028000002000108000001&idtype=cvips&doi=10.1119/1.2342956&prog=normal TPT 28(2), 108].


[:Reaction_Time:Catch a Meter Stick, Reaction time]

Drop a meter stick and have a student catch it. Distance can be converted to reaction time.


[:Reaction_Time:Catch a Dollar, Reaction time]

Hold a dollar bill vertically and have the student put his thumb and index finger on either side of the bill at the midpoint. Drop the dollar and see that the student will likely not be able to react in the short time it takes for the dollar to fall through his fingers. See [http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=PHTEAH000014000003000177000001&idtype=cvips&doi=10.1119/1.2339346&prog=normal TPT 14(3), 177].


Pendulum Timed Free Fall

A pendulum released from the side hits a ball dropped from the specific height that gives a fall time equal to a quarter period of the pendulum. See [http://physicslearning.colorado.edu/PIRA/Sutton/PARTI.pdf#pagemode=none&page=1 Sutton] M-86.


Many Bounce Method

Time a bouncing ball for many bounces and determine g using the coefficient of restitution. See [http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=AJPIAS000055000001000059000001&idtype=cvips&doi=10.1119/1.14971&prog=normal AJP 55(1), 59].



fw: MotionIn1D (last edited 2018-07-18 16:18:18 by srnarf)