is that true a block on a flat surface. The normal force on the block and weight of the block make up a third law pair.
Yes, if the surface is horizontal. They are equal in that case.
If there is an incline, the normal force on the block equals the component of the weight normal to the incline.
The block and the surface below it are ALWAYS a third law pair. They exert equal forces on each other.
Yes, it is true that the normal force on a block on a flat surface and the weight of the block form a third law pair.
To understand this concept, let's break it down step-by-step:
1. Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. This means that whenever an object exerts a force on another object, the second object exerts an equal and opposite force back on the first object.
2. In the case of a block on a flat surface, we have two forces acting on the block: the weight of the block and the normal force exerted by the surface.
3. The weight of an object is the force exerted on it due to gravity. It acts vertically downward, pulling the object towards the center of the Earth.
4. The normal force, on the other hand, is the force exerted by a surface to support the weight of an object resting on it. It acts perpendicular to the surface, in a direction opposite to the force of gravity.
5. According to Newton's Third Law, the weight of the block and the normal force exerted by the surface are an action-reaction pair. The weight of the block is the action force exerted by the Earth on the block, and the normal force is the reaction force exerted by the block on the surface.
6. The normal force and the weight have equal magnitudes but opposite directions, satisfying the requirement of Newton's Third Law.
In summary, the normal force on a block on a flat surface and the weight of the block form a third law pair: the normal force is the reaction force to the weight of the block.