how do objects vibrate?
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ᴡʜᴇɴ ᴀɴ ᴏʙᴊᴇᴄᴛ ᴠɪʙʀᴀᴛᴇs, ɪᴛ ᴅᴏᴇsɴ'ᴛ ᴍᴏᴠᴇ ᴘᴇʀᴍᴀɴᴇɴᴛʟʏ ᴏᴜᴛ ᴏғ ᴘᴏsɪᴛɪᴏɴ. ... ʙᴜᴛ ᴀɴ ᴏʙᴊᴇᴄᴛ ɪɴ ᴠɪʙʀᴀᴛɪᴏɴᴀʟ ᴍᴏᴛɪᴏɴ ᴡɪɢɢʟᴇs ᴀʙᴏᴜᴛ ᴀ ғɪxᴇᴅ ᴘᴏsɪᴛɪᴏɴ - ɪᴛs ᴏʀɪɢɪɴᴀʟ ᴇǫᴜɪʟɪʙʀɪᴜᴍ ᴘᴏsɪᴛɪᴏɴ. ʙᴇᴄᴀᴜsᴇ ᴏғ ᴛʜᴇ ʀᴇsᴛᴏʀɪɴɢ ғᴏʀᴄᴇ, ᴠɪʙʀᴀᴛɪɴɢ ᴏʙᴊᴇᴄᴛs ᴅᴏ ᴛʜᴇ ʙᴀᴄᴋ ᴀɴᴅ ғᴏʀᴛʜ.
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When an object vibrates, it doesn't move permanently out of position. ... But an object in vibrational motion wiggles about a fixed position - its original equilibrium position. Because of the restoring force, vibrating objects do the back and forth.
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