Common Misconceptions

⚠️ Common Misconceptions

Misconception 1: "Doubling speed doubles kinetic energy"

This is the most common mistake in kinetic energy questions. Doubling the speed QUADRUPLES the kinetic energy because KE depends on v², not v. If v doubles, v² increases by a factor of 4. This is why road safety campaigns focus so heavily on speed reduction — even small speed increases cause large increases in crash energy.

Misconception 2: "A heavier object always has more kinetic energy"

KE depends on both mass AND velocity. A light, fast object can have far more KE than a heavy, slow one. A tennis ball served at 70 m/s has more KE than a bowling ball rolling at 5 m/s, despite the bowling ball being 120 times heavier. Always calculate — don't assume.

Misconception 3: "The ½ in the equation can be ignored"

The ½ is not optional! It comes directly from the mathematics of acceleration and cannot be left out. Forgetting the ½ will give you an answer that is exactly twice what it should be, losing all marks in a calculation question.