Question

6. Friction can be increased by
a) making the surfaces rough
b) lubricating the surfaces
c) using ball bearings
d) using streamlined shapes​

Answer 1

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(ʙ) Mᴀᴋɪɴɢ ᴛʜᴇ sᴜᴿғᴀᴄᴇs ᴿᴏᴜɢʜ

Tʜᴇ ᴿᴏᴜɢʜᴇᴿ ᴀ sᴜᴿғᴀᴄᴇ, ɢᴿᴇᴀᴛᴇᴿ ᴛʜᴇ ғᴿɪᴄᴛɪᴏɴ. 

Answer 2

Answer:

making the surface rough