Mechanics > Kinematics > Relative Motion
DCS# 1E10.10

RELATIVE VELOCITIES

motorized car


APPARATUS
motorized toy car with magnets
202-14-E2
scrolling chalkboard
201

DESCRIPTION
Rev up the car and send it up or across the chalkboard, while moving the board vertically at a constant velocity.  Note that the car motor has two speeds and the slower one is preferable here; you can switch between them by pressing down on the car.

The car will not make it across the entire board, so to illustrate the "crossing the river" problem, send it across the demonstration table on a piece of poster board that is moving at the appropriate speed.