Tenpin bowling ball rolling down an incline (NCPQ)

Rolling a tenpin bowling ball and a volley ball down an incline. Provide opportunities for students to talk about themselves by asking if anyone like ten-pin bowling. If so, ask about how you make the ball spin, or does it roll or slide down the lane. Answer: the ball skids along the first two-thirds (13 m) of the 18 m lane which is low friction and polished with oil. The last 5 m is the ‘back end’ of the lane which has no applied oil and is where the ball rolls. Balls have weight blocks inside them to make them curve ‘bias’ when they roll.
A good demonstration is to ask which will travel further along the ground after being allowed to roll down an incline: a ten-pin bowling ball or a volleyball (same diameter)?
This demonstration shows the results. My tests gave 8 m for a 10-pin bowling ball, and 4 m for a volleyball on a vinyl floor when released from a height of 5 cm down a 1.2 m incline. Actually, the only factor that makes a difference is the coefficient of rolling friction between the ball and the vinyl. The fact that they have different masses and rotational inertia cancels out.
This video was made by Dr Richard Walding ably assisted by his fine Year 11 Physics student Hannah at Moreton Bay College in May 2019.
My thanks to Donna at Zone Bowling Capalaba for giving me the ten-pin bowling ball.
Reference New Century Physics for Queensland, Units 3 & 4, 3rd ed, OUP 2019 by Dr Richard Walding. Chapter 2.3 page 80-86.
Website: seniorphysics.com/ncpq