Why is rolling friction less than sliding friction?
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Answer:
Rolling friction is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. Sliding friction is the force resisting the motion when a body slides on a surface. The force of friction depends on the area of contact between the two surfaces. As the area of contact is less in the case of rolling than in the case of sliding, rolling friction is less than the sliding friction. Rolling friction is the resistance to motion experienced by a body when it rolls upon another. It is much less than sliding friction for the same pair of bodies.
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Sʟɪᴅɪɴɢ ғʀɪᴄᴛɪᴏɴ ɪs ᴛʜᴇ ғᴏʀᴄᴇ ʀᴇsɪsᴛɪɴɢ ᴛʜᴇ ᴍᴏᴛɪᴏɴ ᴡʜᴇɴ ᴀ ʙᴏᴅʏ sʟɪᴅᴇs ᴏɴ ᴀ sᴜʀғᴀᴄᴇ. Tʜᴇ ғᴏʀᴄᴇ ᴏғ ғʀɪᴄᴛɪᴏɴ ᴅᴇᴘᴇɴᴅs ᴏɴ ᴛʜᴇ ᴀʀᴇᴀ ᴏғ ᴄᴏɴᴛᴀᴄᴛ ʙᴇᴛᴡᴇᴇɴ ᴛʜᴇ ᴛᴡᴏ sᴜʀғᴀᴄᴇs. As ᴛʜᴇ ᴀʀᴇᴀ ᴏғ ᴄᴏɴᴛᴀᴄᴛ ɪs ʟᴇss ɪɴ ᴛʜᴇ ᴄᴀsᴇ ᴏғʀᴏʟʟɪɴɢ ᴛʜᴀɴ ɪɴ ᴛʜᴇ ᴄᴀsᴇ ᴏғsʟɪᴅɪɴɢ, ʀᴏʟʟɪɴɢ ғʀɪᴄᴛɪᴏɴ ɪs ʟᴇss ᴛʜᴀɴ ᴛʜᴇ sʟɪᴅɪɴɢ ғʀɪᴄᴛɪᴏɴ.