[: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

Grayed Demos are either not available or haven't been built yet

1C10. Velocity


Demonstration Name



Bulldozer or Cart on moving sheet

The bulldozer or cart on a moving sheet moves in the same or opposite direction as the moving sheet, not at a angle, to show addition and subtraction of velocities.


PASCO dynamics cart 


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 (Airtrack & Glider)

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


Velocity -air track and glider

Level air track with the Pasco echo system and computer to show several velocity 


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 1725 RPM disc with a stroboscope at multiples of the frequency to demonstrate the limiting process.


Terminal Velocity

A Marble is droped in to a cylener of Glycerine which teaches terminal velocity. Obtaining a slow constant velocity that can be measured.

1C20. Uniform Acceleration


Demonstration Name



Penny and Cotton (guinea and feather)

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


Drop wooden and lead ball of same size

 Show that all objects, heavy and light, when dropped simultaneously have the same acceleration and that they hit the ground at the same time. 


Equal Time & Equal Distance

Hang on ceiling two long strings with balls - one with equal distance intervals(1,4,8,12,16)? and the other with equal time intervals(1,4,9,16).


Inclined Air Track

Using the Pasco interface with echo censer and computer to show the acceleration, velocity, or displacement graphs as a function of time is obtained for a cart on an inclined air track as it accelerates down and rebounds. (Pasco mass cars and track can also be used here)


Acceleration "Al" track

Using the long aluminum inclined track and a metronome.  A lager steel ball is released and aloud to accelerate down the track. The metronome click off at distance intervals(1,4,8,12,16) down the track.


Acceleration "Al" track

A ball rolls down a sloped track onto a level track. As a  metronome clicks off, such that the ball passes the marked distance.


Duff's plane

A ball leaves a trail as it oscillates back and forth while rolling down a chalk covered trough.

1C30. Measuring g


Demonstration Name



free fall timer

A ball is timed as it drops .5m, 1m, 1.5m, or 2m.


dropping balls

A ball is released by an electromagnet and a clock started. The catcher stops the clock and can be set at different heights.


Free Fall Apparatus

A table top free fall apparatus with push button sparker and using spark tape. Different weight can be used on the leading end of the tape.


"videostrobe" with falling drops

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.


Catch a Meter Stick, Reaction time

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


Catch a Dollar, Reaction time

Have a student try to catch a dollar starting with the fingers at the midpoint.


pendulum timed free fall

A pendulum released from the side hits a ball dropped from the height that gives a fall time equal to a quarter period of the pendulum.


many bounce method

Time a bouncing ball for many bounces and determine g using the coefficient of restitution.