When we throw mud on a wall, Newton's laws of motion are still obeyed. Let's examine the situation using Newton's laws:
- Newton's First Law of Motion (Law of Inertia): An object at rest tends to stay at rest, and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an external force.
In the case of throwing mud on a wall, the mud was initially at rest or moving with some velocity in the direction of the throw. When it hits the wall, it experiences an external force, which is the contact force between the mud and the wall. This force brings the mud to a stop, altering its motion. According to Newton's first law, the mud will tend to stay at rest on the wall unless acted upon by another force.
- Newton's Second Law of Motion: The acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. Mathematically, it can be expressed as F = ma, where F is the net force, m is the mass of the object, and a is the acceleration.
When the mud hits the wall, the net force acting on it is provided by the contact force between the mud and the wall. This force causes the mud to decelerate, resulting in a change in velocity. The acceleration of the mud is determined by the magnitude of the force and the mass of the mud.
- Newton's Third Law of Motion: For every action, there is an equal and opposite reaction.
When the mud hits the wall, it exerts a force on the wall, and, according to Newton's third law, the wall exerts an equal and opposite force on the mud. This force is responsible for the deceleration of the mud and causing it to stick to the wall.
In summary, when we throw mud on a wall, Newton's laws of motion are still applicable. The mud experiences external forces that cause it to change its motion, and the equal and opposite forces ensure conservation of momentum.