The motion of the ball The speed of the ball Friction from the ground A magnetic field
I gave my students this multiple choice question: A student rolls a ball on the ground. Which of these causes the ball to slow down and then stop?

Only one answer is correct among these 4 choices:
- The motion of the ball
- The speed of the ball
- Friction from the ground
- A magnetic field

Could you tell me which one is correct?

Friction from the ground