Question

1 What type of lever is a
crowbar?
2 in the human arm the elbow
is the fulcrum, the effort is
produced by the biceps and the
load acts downwards through
the hand. What class of lever is
this part of the human arm?
3 A bottle opener has its fulcrum
at one end of the lever and the
effort is applied at the other
end. What class of lever is it?​

Answer 1

Answer:

ɪ) ɪɴ ᴀ ғɪʀsᴛ-ᴄʟᴀss ʟᴇᴠᴇʀ, ᴛʜᴇ ғᴜʟᴄʀᴜᴍ ɪs ᴘʟᴀᴄᴇᴅ ʙᴇᴛᴡᴇᴇɴ ᴛʜᴇ ᴇғғᴏʀᴛ ᴀɴᴅ ʟᴏᴀᴅ ᴛᴏ ʀᴇsᴇᴍʙʟᴇ ᴀ sᴇᴇsᴀᴡ. ᴇxᴀᴍᴘʟᴇs ᴏғ ᴛʜɪs ᴛʏᴘᴇ ᴏғ ʟᴇᴠᴇʀ ɪɴᴄʟᴜᴅᴇ ᴀ ʙᴀʟᴀɴᴄᴇ sᴄᴀʟᴇ, ᴄʀᴏᴡʙᴀʀ, ᴀɴᴅ ᴀ ᴘᴀɪʀ ᴏғ sᴄɪssᴏʀs. ᴀ sᴇᴄᴏɴᴅ-ᴄʟᴀss ʟᴇᴠᴇʀ ɪs ᴡʜᴇɴ ᴛʜᴇ ʟᴏᴀᴅ ɪs ᴘʟᴀᴄᴇᴅ ʙᴇᴛᴡᴇᴇɴ ᴛʜᴇ ғᴜʟᴄʀᴜᴍ ᴀɴᴅ ᴇғғᴏʀᴛ.

ɪɪ) ᴀ ʙᴇɴᴛ ᴀʀᴍ ɪs ᴀ ᴄʟᴀss 3 ʟᴇᴠᴇʀ. ᴛʜᴇ ᴘɪᴠᴏᴛ ɪs ᴀᴛ ᴛʜᴇ ᴇʟʙᴏᴡ ᴀɴᴅ ᴛʜᴇ ғᴏʀᴇᴀʀᴍ ᴀᴄᴛs ᴀs ᴛʜᴇ ʟᴇᴠᴇʀ ᴀʀᴍ. ᴛʜᴇ ʙɪᴄᴇᴘs ᴍᴜsᴄʟᴇ ᴘʀᴏᴠɪᴅᴇs ᴛʜᴇ ᴇғғᴏʀᴛ (ғᴏʀᴄᴇ) ᴀɴᴅ ʙᴇɴᴅs ᴛʜᴇ ғᴏʀᴇᴀʀᴍ ᴀɢᴀɪɴsᴛ ᴛʜᴇ ᴡᴇɪɢʜᴛ ᴏғ ᴛʜᴇ ғᴏʀᴇᴀʀᴍ ᴀɴᴅ ᴀɴʏ ᴡᴇɪɢʜᴛ ᴛʜᴀᴛ ᴛʜᴇ ʜᴀɴᴅ ᴍɪɢʜᴛ ʙᴇ ʜᴏʟᴅɪɴɢ.

ɪɪɪ) ᴏᴛʜᴇʀ ᴇxᴀᴍᴘʟᴇs ᴏғ ғɪʀsᴛ ᴄʟᴀss ʟᴇᴠᴇʀs ᴀʀᴇ ᴘʟɪᴇʀs, sᴄɪssᴏʀs, ᴀ ᴄʀᴏᴡ ʙᴀʀ, ᴀ ᴄʟᴀᴡ ʜᴀᴍᴍᴇʀ, ᴀ sᴇᴇ-sᴀᴡ ᴀɴᴅ ᴀ ᴡᴇɪɢʜɪɴɢ ʙᴀʟᴀɴᴄᴇ. ɪɴ sᴜᴍᴍᴀʀʏ, ɪɴ ᴀ ғɪʀsᴛ ᴄʟᴀss ʟᴇᴠᴇʀ ᴛʜᴇ ᴇғғᴏʀᴛ (ғᴏʀᴄᴇ) ᴍᴏᴠᴇs ᴏᴠᴇʀ ᴀ ʟᴀʀɢᴇ ᴅɪsᴛᴀɴᴄᴇ ᴛᴏ ᴍᴏᴠᴇ ᴛʜᴇ ʟᴏᴀᴅ ᴀ sᴍᴀʟʟᴇʀ ᴅɪsᴛᴀɴᴄᴇ, ᴀɴᴅ ᴛʜᴇ ғᴜʟᴄʀᴜᴍ ɪs ʙᴇᴛᴡᴇᴇɴ ᴛʜᴇ ᴇғғᴏʀᴛ (ғᴏʀᴄᴇ) ᴀɴᴅ ᴛʜᴇ ʟᴏᴀᴅ.