Question

why does an object float or sink when placed on the surface of water​

Answer 1

Aɴ ᴏʙᴊᴇᴄᴛ ғʟᴏᴀᴛ ᴏʀ sɪɴᴋ ᴡʜᴇɴ ᴘʟᴀᴄᴇᴅ ᴏɴ ᴛʜᴇ sᴜʀғᴀᴄᴇ ᴏғ ᴛʜᴇ ᴡᴀᴛᴇʀ ʙᴇᴄᴀᴜsᴇ﹐ Aɴ ᴏʙᴊᴇᴄᴛ sɪɴᴋs ɪɴ ᴡᴀᴛᴇʀ ɪғ ɪᴛs ᴅᴇɴsɪᴛʏ ɪs ɢʀᴇᴀᴛᴇʀ ᴛʜᴀɴ ᴛʜᴀᴛ ᴏғ ᴡᴀᴛᴇʀ. Aɴ ᴏʙᴊᴇᴄᴛ ғʟᴏᴀᴛs ɪɴ ᴡᴀᴛᴇʀ ɪғ ɪᴛs ᴅᴇɴsɪᴛʏ ɪs ʟᴇss ᴛʜᴀɴ ᴛʜᴀᴛ ᴏғ ᴡᴀᴛᴇʀ. Wʜᴇɴ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ·s ᴡᴇɪɢʜᴛ ғᴏʀᴄᴇ ɪs ʙᴀʟᴀɴᴄᴇᴅ ʙʏ ᴛʜᴇ ᴜᴘᴡᴀʀᴅ ᴘᴜsʜ ᴏғ ᴛʜᴇ ᴡᴀᴛᴇʀ ᴏɴ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ.

Answer 2

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An object float or sink when placed on the surface of the water because,

• When the object's weight force is balanced by the upward push of the water on the object.
• If the weight force down is larger than the water's upward push on the object, then the object will sink.