The weight of a baseball does not significantly affect its trajectory. The primary factors that determine a baseball's trajectory are its initial velocity, angle of release, and air resistance.
Spin has a significant impact on the movement of a baseball. The Magnus effect, caused by the spin of the ball, creates a pressure differential that causes the ball to curve or break in a certain direction.
Air resistance, also known as drag force, has a major influence on the flight of a baseball. As the ball moves through the air, it experiences a force that opposes its motion, causing it to slow down and change direction.
The faster a pitch is thrown, the less time a batter has to react. This is due to the fact that the speed of the pitch affects the distance it travels before reaching the plate. As pitch speed increases, batters have less time to make a decision on whether to swing or not.
The sweet spot on a baseball bat is the ideal location for hitting the ball, resulting in maximum distance and power. Factors that contribute to the sweet spot include the material and weight of the bat, the hitter's swing speed and technique, and the location and velocity of the pitch.