Conjecture 2: The height h of basketball bounce may be related to the force F of the hand under the ball when it falls.
Guess 3: The height H of basketball gas may be related to the inflation V of the ball.
(2) Because we suspect that the height of basketball bounce is related to three factors, we need to use the control variable method in verification.
(3) Using the control variable method, the design idea is as follows:
(1) Keep the downward force f when the ball falls the same as the inflation v of the ball, let the ball fall at different heights, and observe and measure the height h of the basketball ball.
(2) It is best to keep the height h and v of the ball at the same time, hit the ball downward with different forces F, observe and measure the height H3 of the basketball ball, keep the height h of the ball at the same time as the downward force F, let the ball release some gas, and observe and measure the height h of the basketball ball.