1. What is Kinetic Energy in a Car Crash?

Kinetic energy is the energy an object possesses due to its motion. In a car crash, the kinetic energy must be dissipated, which is what causes damage to vehicles and injuries to occupants.

2. How Does the Calculator Work?

The calculator uses the kinetic energy equation:

Where:

• \( KE \) — Kinetic energy (Joules)
• \( m \) — Mass of the vehicle (kg)
• \( v \) — Velocity (20 mph converted to 8.94 m/s)

Explanation: The equation shows that kinetic energy increases with the square of velocity, making speed a critical factor in crash severity.

3. Importance of Kinetic Energy Calculation

Details: Understanding the kinetic energy involved in a crash helps evaluate potential damage, design safer vehicles, and understand injury risks.

4. Using the Calculator

Tips: Enter the vehicle mass in kilograms. The calculator assumes a crash speed of 20 mph (8.94 m/s).

5. Frequently Asked Questions (FAQ)

Q1: Why is 20 mph significant?
A: 20 mph is a common urban speed limit and represents a typical low-speed collision that can still cause significant damage.

Q2: How does mass affect crash energy?
A: Kinetic energy is directly proportional to mass - doubling the mass doubles the energy in the collision.

Q3: What's the conversion from mph to m/s?
A: 1 mph = 0.447 m/s, so 20 mph = 8.94 m/s.

Q4: What typical values should I expect?
A: For a 1500 kg car at 20 mph, KE ≈ 60,000 J. For comparison, a 50 kg pedestrian would have KE ≈ 2,000 J.

Q5: How does this relate to crash safety?
A: Modern vehicles are designed to absorb this energy through crumple zones to protect occupants.