1. What is Rebound Ratio?

Definition: The rebound ratio measures the elasticity of a material by comparing its rebound height to its initial drop height.

Purpose: It's commonly used in sports science (ball testing), material science, and engineering to evaluate energy retention.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R \) — Rebound ratio (dimensionless)
• \( h_r \) — Rebound height (meters)
• \( h \) — Initial height (meters)

Explanation: The ratio represents what percentage of the initial height the object rebounds to after impact.

3. Importance of Rebound Ratio

Details: A higher ratio indicates better elasticity and energy retention. This is crucial for sports equipment, shock absorbers, and material testing.

4. Using the Calculator

Tips: Measure both heights accurately in meters. The rebound height should be ≤ initial height. Values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does a rebound ratio of 0.75 mean?
A: It means the object rebounds to 75% of its initial drop height, retaining 75% of its energy.

Q2: Can the rebound ratio be greater than 1?
A: Normally no, unless additional energy is added during impact (like a superball effect).

Q3: What affects rebound ratio?
A: Material properties, temperature, surface hardness, and impact velocity.

Q4: How is this different from coefficient of restitution?
A: COR is the square root of rebound ratio (e = √R) when considering velocity.

Q5: What's a typical basketball rebound ratio?
A: About 0.75-0.85 when properly inflated on a hard surface.