Why friction is self-adjusting force?
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Answer:
sᴛᴀᴛɪᴄ ғʀɪᴄᴛɪᴏɴ ɪs ᴄᴏɴsɪᴅᴇʀᴇᴅ ᴀ sᴇʟғ ᴀᴅᴊᴜsᴛɪɴɢ ғᴏʀᴄᴇ ʙᴇᴄᴀᴜsᴇ ɪᴛ ᴡᴀɴᴛs ᴛᴏ ᴛʜᴇ ᴏʙᴊᴇᴄᴛs ᴛᴏ ʀᴇᴍᴀɪɴ ᴀᴛ ʀᴇsᴛ ᴀɴᴅ ɴᴏᴛ ᴍᴏᴠᴇ. ᴛʜᴇʀᴇғᴏʀᴇ, ɪғ ᴀɴ ᴇxᴛᴇʀɴᴀʟ ғᴏʀᴄᴇ ɪs ᴀᴘᴘʟɪᴇᴅ, ᴛʜᴇ sᴛᴀᴛɪᴄ ғʀɪᴄᴛɪᴏɴ ғᴏʀᴄᴇ ᴡɪʟʟ ᴇǫᴜᴀʟ ᴛʜᴇ ᴍᴀɢɴɪᴛᴜᴅᴇ ᴏғ ᴛʜᴇ ᴇxᴛᴇʀɴᴀʟ ғᴏʀᴄᴇ, ᴜɴᴛɪʟ ɪᴛ sᴜʀᴘᴀssᴇs ᴛʜᴇ ᴛʜʀᴇsʜᴏʟᴅ ᴏғ ᴍᴏᴛɪᴏɴ.
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Explanation:
Static friction is considered a self adjusting force because it wants to the objects to remain at rest and not move. Therefore, if an external force is applied, the static friction force will equal the magnitude of the external force, until it surpasses the threshold of motion.
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