what change could be made to reduce the error caused by friction in an inelastic collision

To reduce the error caused by friction in an inelastic collision, you could:

1. Use a smoother surface: The smoother the surface, the less friction there will be. This could be achieved by polishing the surface or using a material with low friction like ice or a well-oiled surface.

2. Use lighter objects: The heavier the objects involved in the collision, the more friction there will be. By using lighter objects, you can reduce the amount of friction.

3. Increase the speed: The faster the objects are moving, the less time there is for friction to act on them. This could reduce the amount of error caused by friction.

4. Use spherical objects: Spherical objects have less surface area in contact with the ground, which can reduce friction.

5. Use air tracks or magnetic levitation: These methods can virtually eliminate friction by reducing the contact between the colliding objects and the surface.

Remember, in a perfectly inelastic collision, the objects stick together after the collision, so reducing friction can help to ensure that the collision is as inelastic as possible.