/*******************************************************************************************************/
/* TITLE - Required                                                                                    */
/*******************************************************************************************************/

======Burning Paper with Colliding Steel Balls======


/*******************************************************************************************************/
/* GREY BOX INFORMATION - Required                                                                     */
/*******************************************************************************************************/
/* Leave this unchanged */

<WRAP right box>
**Materials: **{{$demo.materials_description}}\\
**Difficulty: **{{$demo.difficulty_description}}\\
**Safety: **{{$demo.safety_description}}\\
\\
**Categories:** {{$demo.categories}}
\\


/*******************************************************************************************************/
/* Alternative Titles - Optional (But the text must be left in)                                        */
/*******************************************************************************************************/

**Alternative titles:** Colliding Spheres
</WRAP>


/*******************************************************************************************************/
/* SUMMARY - Required                                                                                  */
/*******************************************************************************************************/
/* Leave this unchanged */

====Summary====                   
{{$demo.summary}}


/*******************************************************************************************************/
/* PROCEDURE - Optional                                                                                */
/*******************************************************************************************************/

====Procedure====  
  - Obtain two solid steel balls.
  - Strike the steel balls together with the paper in between.
  - Repeat the collision a few times until a burning smell is noticeable.
  - Observe the appearance of brown or black scorch marks and small holes in the paper.


/*******************************************************************************************************/
/* Links - Optional                                                                                    */
/*******************************************************************************************************/

====Links==== 
Burning paper with steel ball-bearings - Steve Mould: 
{{youtube>COWOv8aOoSU?}}\\
📄 Two balls colliding can create heat and burn paper - Utah Physics: [[https://web.physics.utah.edu/~sps/demo/node21.html#:~:text=Hit%20the%20two%20steel%20balls,and%20holes%20in%20the%20paper.]]\\


/*******************************************************************************************************/
/* VARIATIONS - Optional                                                                               */
/*******************************************************************************************************/

====Variations====
  * Use different thicknesses of paper to test how easily it scorches.
  * Try balls of different materials (e.g., brass, aluminum) to compare heat effects.
  * Test whether repeated lighter collisions produce the same effect as fewer strong impacts.


/*******************************************************************************************************/
/* SAFETY PRECAUTIONS - Required                                                                       */
/*******************************************************************************************************/

====Safety Precautions====
  * Keep fingers clear of the impact area to avoid injury.


/*******************************************************************************************************/
/* QUESTIONS TO CONSIDER - Optional                                                                    */
/*******************************************************************************************************/

====Questions to Consider====
  * What form of energy conversion is taking place in this demonstration?
  * Why does the paper burn but not catch fire completely?
  * How does the law of conservation of energy explain what happens during the collision?
  * Would elastic collisions generate the same amount of heat? Why or why not?
  * What factors influence how much heat is generated at the point of impact?


/*******************************************************************************************************/
/* DEMONSTRATION INFORMATION - Required                                                                */
/*******************************************************************************************************/

/* Complete information in the Demonstration Info box below, following instructions exactly. */