Cambridge Secondary (7-9). Stage 9. MCE Science. Workbook - Unit 8: Rate of Reaction - Question 19

Attach one hook piece and one loop piece of fastening strip (each 2 cm long) to different spots on each of two tennis balls using adhesive tape. Gently roll or toss the balls towards each other 10 times. Record whether they stick together and whether the strips meet with the correct orientation.

Predict what will happen when the balls collide on sides without fastening strips.