In the given baseball the blue line represents gravity. Gravitational Force attracts the objects towards the center of the earth.
It is the force that attracts the objects towards the center of the earth. Every massive object has gravitational force but it is negligible for smaller objects.
Friction force works against the direction of the motion of the objects. The Normal force is the reaction of the gravitational force hence it acts upwards.
Therefore, in the given baseball the blue line represents gravity.
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