Question

a teacher performs a demonstration for their class using a metal ball and ring like the one in the picture. the teacher asks the students to explain what happens to the ball from step 1 to step 3. which explanation is the best?

1. the particles in the ball gained kinetic energy when the temperature increased, and this caused each particle to increase in size, so the ball expanded.
2. the particles in the ball gained kinetic energy when the temperature increased, and this caused them to spread out and increase the size of the ball.
3. the particles in the ball lost kinetic energy to the air when the temperature increased, which caused the particles to spread out and make the ball larger.
4. the heat added particles to the ball, which made the ball increase in size.

Explanation:

The demonstration involves thermal expansion of a metal ball, related to particle kinetic energy and temperature. The first explanation correctly states that particles in the ball gain kinetic energy with temperature increase, causing each particle to expand in size (leading to the ball’s expansion). Other options have errors: the second says particles "spread out" (misconception, particles themselves expand in vibrational motion, not spread), the third claims energy loss (incorrect, heating adds energy), and the fourth is vague.

Answer:

The first explanation (The particles in the ball gained kinetic energy when the temperature increased, and this caused each particle to increase in size, so the ball expanded.)