motion
Friction.
Friction is a force that works against motion by opposing the movement of an object as it slides along a surface. It acts to slow down or stop the motion of the object.
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.
Friction typically works against an applied force by creating resistance to the motion of objects in contact. This resistance can cause the applied force to be partially or fully counteracted, slowing down or preventing the motion of the objects.
Friction is the force that works against motion. It occurs when two surfaces rub against each other, creating resistance that opposes the direction of motion. Friction can slow down or stop the movement of an object.
The force of friction acts against an object traveling horizontally, opposing its motion and causing it to slow down.
Friction is a force that opposes the motion of objects. It occurs when two surfaces rub against each other, causing a resistance that can slow down or stop the movement of the object.
Friction does not move things. Friction is the force that opposes motion between two objects that are touching. Not enough friction allows for things to move, depending on what kind of friction; the less force it has.
the net force is 20 newtons because friction always works against direction of motion.
Motion
Friction is always against the direction of the movement.
Friction. Opposing Force