IDNStudy.com, ang komunidad ng pagbabahagi ng kaalaman. Magtanong ng anumang bagay at makatanggap ng kumpleto at eksaktong sagot mula sa aming komunidad ng mga propesyonal.

Which shows that the surface of the ground is affected by friction force?

A.Cemented floor only
B.Grassy Area
C.Both cemented and grassy area
D.None of these​