As a result the pressure of the basketball is in the winter

Timothy plays basketball in his driveway during the summer. By accident, he left the basketball outside during the winter. He tried to bounce it, but it would not bounce because it was partially deflated. During the winter, air molecules in the basketball move slower than in the summer. As a result, the pressure of the basketball is reduced in the winter.

Explanation:

The movement of air molecules in the basketball will maintain the pressure in the ball thus keeping its shape perfect. As summer has high temperature of air molecules and it is known that temperature is directly proportional to the pressure of the molecules. So in summer the air molecules will move fast inside the ball.

But in winter, the temperature of air molecules decreases leading to reduction in the speed of air molecules and thus when it enters the ball, it fails to strike the walls of the ball with same pressure. This leads to flattening of the ball as the pressure of the basketball is reduced in winter.