because of the inertia of the object as stated by Newton's first law of motion.
Frictional force
Friction or Resistance
Friction!
Friction.
Friction.
A force that tends to oppose motion
Oppose motion.
Friction.
Because the force generated is always opposite the direction of motion.
Oppose & Prevent
Inertia is a property of matter that makes it harder to move, so that is probably what you are thinking of, but technically, forces do not oppose motion. Depending upon the direction in which a force is applied, one force can oppose another force that is acting in an opposite direction, but forces are not opposed to motion as such.
There are many types of forces that oppose motion such as friction, drag and most universal, gravity.