Mechanics: Marble on Plate

PIRA Class: 1D55.12

Purpose:
To observe the direction of velocity for an object in uniform circular motion.

Description:
A marble is rolled around a paper plate in which a "slice" has been removed. Students predict where a marble will go when it reaches the "pie slice" opening in the plate.

1. Roll marble around the inside rim of a sturdy paper plate. Discuss the motion of the marble and any forces acting on the marble.

2. Remove pie slice and observe direction of marble.

PEDAGOGY: Lay out butcher paper or use chalk on the table to mark student predictions before removing the pie slice.

Equipment:
Sturdy paper plate with removable pie slice and a marble

Location:
Shelf 113