Question

A boy slides on a smooth floor. What makes the boy to slow down?
a. Sliding friction between the surface of the shoes and the smooth floor.
b. Rolling friction between the surface of the shoes and the smooth floor.
c. Fluid friction between the surface of the shoes and the smooth floor.
d. Static friction between the surface of the shoes and the smooth floor

Answer 1

a. Sliding friction between the surface of the shoes and the smooth floor.