Impact forces are the forces that occur when two objects collide. These forces can cause changes in motion, deformation, or damage to the objects involved. For example, when a car hits a wall, the impact force can cause the car to crumple and the wall to crack, depending on the speed and mass of the car. The strength of an impact force depends on several factors, including the speed of the objects, their mass, and the angle of collision. Understanding impact forces is important in fields like engineering and safety design, where minimizing damage and protecting people during collisions is crucial.