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Exploring Newton’s First Law: Inertia (Developed by SEPUP)

kit #351S

Using the specially-designed LAB-AIDS©/SEPUP track, students investigate inertia by observing a marble’s motion.

In Part 1:

• They observe a marble in motion around a circular track then predict what path it will follow when a section of the track is removed, allowing the marble to roll unconstrained across the table top.
• Students discover that once the marble leaves the confines of the track, it moves in a straight line path.
• They also investigate how changing the mass of the marble affects the motion of the marble on the track.

In Part 2 they complete a reading about inertia and Newton’s first law of motion.

Accommodates unlimited classes, each with 6 groups of 4 students.


  • An object that is not being subject to a force will continue to move at a constant speed in a straight line
  • Friction is a force that causes changes in the speed of an object’s motion
  • Scientific explanations emphasize evidence, have logically consistent arguments, and use scientific principles, models, and theories

Content List in Exploring Newton’s First Law: Inertia (Developed by SEPUP) is as follows:

Quantity Description
1 Teacher’s Guide
28 Student Worksheets and Guides - Parts 1 and 2
6 Roundabout tracks, LAB-AIDS®
6 Glass marbles
6 Metal marbles
6 Miniature road cones
1 Transparency: Inertia Diagrams
Number of students
Number of groups
Maximum 6 groups per period

To complete the two activities in this kit requires two to three ~50-minute class periods.

Title Item # Price Quantity
Exploring Newton's First Law: Inertia (Developed by SEPUP) 351S $104.95
ADD A GROUP for Exploring Newton's First Law: Inertia 351SEL $21.55