Countries may fight against each other due to reasons like geopolitical conflicts, territorial disputes, competition for resources, ideological differences, and historical grievances. Military interventions, economic sanctions, and diplomatic tensions can escalate into conflicts and wars between nations.
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A civil war occurs when two or more groups within the same country engage in armed conflict against each other, often for control of the government or territory.
The force that acts against objects sliding against each other is friction. Friction is the resistance that occurs when two surfaces come into contact and oppose the motion of each other. It acts in the opposite direction to the direction of motion.
The sound of styrofoam rubbing against each other is often described as a squeaky or squeaking noise.
Pebbles bumping against each other in a stream are called "abrasion." This process occurs as the flowing water causes the pebbles to collide and rub against each other, eventually wearing them down over time.
When solid surfaces rub against each other, this friction is called dry friction. It is the force resisting the relative motion of solid surfaces, such as two objects sliding against each other.