Question

which two factors affect kinetic energy?
□ shape—round objects have more kinetic energy than squarish or unevenly shaped objects
□ temperature—cooler objects have more kinetic energy
□ the mass of an object—the larger the object, the more kinetic energy it has
□ state of matter—solids have the least kinetic energy

Explanation:

The formula for kinetic energy is \(KE=\frac{1}{2}mv^{2}\), where \(m\) is mass and \(v\) is velocity. Mass (\(m\)) is directly related to kinetic energy. As for the state of matter, in solids, particles have less freedom of movement (lower average velocity compared to liquids and gases in many cases, assuming same - temperature - like conditions for a fair comparison). Temperature is related to the average kinetic energy of particles in a substance (in the context of thermal energy, higher temperature means higher average kinetic energy of particles, but the option here has an incorrect statement as cooler objects have less kinetic energy). Shape has no direct relation to the formula \(KE = \frac{1}{2}mv^{2}\).

Answer:

the mass of an object—the larger the object, the more kinetic energy it has; state of matter—solids have the least kinetic energy