Friction moves in the opposite direction of force
O moves in the same direction as force
is the reason machines are 100% efficient

moves in the opposite direction of force

Explanation:

Friction is the force that helps in building resistance between two surfaces. It helps in controlling the motion of the object. It acts opposite to the direction of the motion of the moving object. In practical life, fiction helps in reduction slipping and reduces the cases of damage. The lower the friction, the more is the chance of slipping and vice versa.

A: moves in the opposite direction of force

Explanation:

Sorry if im wrong

loess contribute to the flooding of rivers by providing the silt that is washed into rivers and constantly raises the bed of the rivers. this elevation above the surrounding flood plains and dams allow the river to overwhelm the dams and flood thousand of square miles of neighboring flood plains.

in 342 bc j._c. egypt fell into the hands of the persians, under the reign of nectanebo ii

greek city-states unite in a revolt against the persian empire at the beginning of the fifth century bc. j.-c  

from the year 660 or 659 bc ad, cyrus preached the revolt against the medes to deliver the persians.