The type of force here is the gravitational force and the sipa will all yo the ground if it's not caught by the boy.
A gravitational force simply means the force that attracts two objects that has mass.
If the boy did not catch it with his foot, the ball will fall to the ground due to gravitational force.
It should be noted that friction acts between the sipa and foot of the boy. In this case, when two objects are in contact, friction will act in the opposite direction to the motion of the object.
In conclusion, when the sipa is thrown, the force of gravity acts on it by bringing it downwards.
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