premise: as the friction increases, the resistance on the object to move will increase sent2: a toy car is a kind of object sent3: as the resistance on the object to move increase, the object will move slower sent4: as roughness of a surface increases , friction will increase sent5: wood has a smooth surface sent6: carpet has a rough surface.
hypothesis: the moon will have 12 complete revolutions around the earth after a complete revolution of earth around the sun