A force that resists or works against motion is called friction. Friction occurs when two surfaces rub against each other, causing a resistance that opposes the motion of an object.
gary
The Merchant of Venice is one, but their are references in other works.
yardstick
yardstick
A+ reverse osmosis
Antagonist is a process or agent that works against another.
Motion
Any upward force works against gravity,since they act in opposite directions.
A+ reverse osmosis
Antipyretic
motion