while playing baseball you use physics to do anything involved with the baseball. when you go to hit a baseball you need to aply a force with the bat onto the ball in order to get the ball moving. this force needs to be greater than the force that is acting on the bat in order for the ball to go anywhere. also when you throw a baseball you need to apply a force in order to make the ball fly through the air. the greater this force is the farther the ball will travel.