In which situation does the reactive force between two colliding objects cause physical change?

The reactive force between two colliding objects causes physical change in situations where the force is strong enough to cause a deformation or movement in one or both of the objects. This could include situations where objects collide with enough force to break or bend them, or where one object is propelled away from the other due to the force of the collision. In general, the greater the force of the collision, the greater the physical change that will occur as a result of the reactive force between the objects.

The reactive force between two colliding objects can cause physical changes in various situations, including:

1. Elastic Collisions: In an elastic collision, objects collide and bounce off each other without any permanent deformation or loss of kinetic energy. The reactive force causes the objects to deform temporarily during the collision, and they subsequently return to their original shape.

2. Inelastic Collisions: In an inelastic collision, objects collide and stick together or partially deform, resulting in a loss of kinetic energy. The reactive force between the objects causes them to deform, creating physical changes such as shape alterations or permanent damage.

3. Explosions: In explosive situations, the reactive force between objects can cause physical changes such as fragmentation, structural damage, or displacement of objects. The force generated during an explosion can result in the objects breaking apart, releasing energy and causing physical changes in their surroundings.

4. Compressive Situations: In cases where objects are compressed forcefully, the reactive force can cause physical changes such as compression or deformation. For example, when a heavy object is placed on a soft material like clay or foam, the reactive force causes the material to compact and change shape.

It's important to note that the specific physical changes resulting from the reactive force between two colliding objects depend on various factors like the materials involved, collision velocities, and forces applied.