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# Ring and Discs—Demonstration Kit

By: The Flinn Staff

Item #: AP4634

Price: \$22.36

In Stock [173 pcs available]. To view alternative items others have purchased, please see "Suggested Products" below.

In the Ring and Discs Demonstration Kit for physical science and physics, race a ring and a disc of equal mass and diameter down an inclined plane. Results are explained using concepts of inertia and potential and kinetic energy.

## Product Details

It’s a race! A ring and disc of equal mass and diameter speed down an inclined plane. Which one wins? Not an easy prediction to make, but the victor will be clear. Results are explained using concepts of inertia, rotational inertia and potential and kinetic energy. Once students understand the results of the first race, they predict the outcome of a race between the ring and two discs—the second disc being larger than the first. Will the disc diameter make a difference? Includes instructions and detailed mathematical explanation of results.

Concepts: Rotational motion, potential energy, moment of inertia, kinetic energy, Newton’s Law of Motion.
Time Required: 15 minutes

## Specifications

Materials Included in Kit:
Disc, wood, 3½" diameter, x ¾" thick
Disc, wood, 5" diameter, ¾" thick
Ring, PVC, gray, 3½" o.d., 13/16" thick

## Correlation to Next Generation Science Standards (NGSS)†

### Science & Engineering Practices

Constructing explanations and designing solutions
Asking questions and defining problems
Planning and carrying out investigations
Developing and using models

### Disciplinary Core Ideas

MS-PS2.A: Forces and Motion
MS-PS3.A: Definitions of Energy
MS-PS3.B: Conservation of Energy and Energy Transfer
MS-PS3.C: Relationship between Energy and Forces
HS-PS2.A: Forces and Motion
HS-PS3.A: Definitions of Energy
HS-PS3.B: Conservation of Energy and Energy Transfer

### Crosscutting Concepts

Energy and matter
Structure and function
Patterns
Cause and effect

### Performance Expectations

MS-PS2-2: Plan an investigation to provide evidence that the change in an object’s motion depends on the sum of the forces on the object and the mass of the object
MS-PS3-1: Construct and interpret graphical displays of data to describe the relationships of kinetic energy to the mass of an object and to the speed of an object.
MS-PS3-5: Construct, use, and present arguments to support the claim that when the kinetic energy of an object changes, energy is transferred to or from the object.
HS-PS2-1: Analyze data to support the claim that Newton’s second law of motion describes the mathematical relationship among the net force on a macroscopic object, its mass, and its acceleration.
HS-PS3-2: Develop and use models to illustrate that energy at the macroscopic scale can be accounted for as a combination of energy associated with the motion of particles (objects) and energy associated with the relative position of particles (objects).
MS-ETS1-3: Analyze data from tests to determine similarities and differences among several design solutions to identify the best characteristics of each that can be combined into a new solution to better meet the criteria for success.