Bulldozer on Moving Sheet, 1C10.10

Topic and Concept:

• Motion in One Dimension, [:MotionIn1D#Velocity: 1C10. Velocity]

Location:

• Cabinet: [:MechanicsCabinet:Mechanic (ME)]

• Bay: [:MechanicsCabinetBayB4:(B4)]

• Shelf: #2

attachment:Bulldozer01-400.jpg

Abstract:

A bulldozer powered by an electric motor moves in the same or opposite direction as the sheet which is moves beneath it to show addition and subtraction of velocities.

Important Setup Notes:

• The power switch is flaky and touchy

• Please remove the batteries after use to prevent corrosion.

Setup and Procedure:

1. Place sheet of paper or paperboard on table.
2. Turn on the bulldozer by flipping the switch to the "on" position. (Note: Not all the way to "on")
3. Place the bulldozer on the sheet.
4. Pull or push the sheet to show subtractive and additive velocities, respectively.

Cautions, Warnings, or Safety Concerns:

• N/A

Discussion:

If the paper is moving in the same direction as the bulldozer, the velocity of the bulldozer relative to the audience will be the sum of the sheet and bulldozer velocities - simple vector addition. Likewise, if the sheet moves in the opposite direction as the bulldozer, the velocity of the bulldozer will be the difference of the two velocities - simple vector subtraction.

Videos:

• [https://www.youtube.com/user/LectureDemostrations/videos?view=1 Lecture Demonstration's Youtube Channel]

References:

• N/A

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