Fig 14 shows a handheld tin opener. The handles of the tin opener act as a lever mechanism. (a) (i) State the class of lever used in the handles of the tin ...
Question 1 Report
Fig 14 shows a handheld tin opener. The handles of the tin opener act as a lever mechanism.
(a) (i) State the class of lever used in the handles of the tin opener shown in Fig 14. [1]
(ii) State the positions of the effort and the load on the tin opener. [2]
[Total: 3 marks]
Answer Details
(a)(i) The handles of the tin opener operate as a first class lever. [1] In a first class lever, the fulcrum (pivot point) is positioned between the effort and the load. On the tin opener, the central pivot pin sits between where the user squeezes (effort) and where the cutting wheel meets the can rim (load).
(a)(ii)
- Effort: at the ends of the handles where the user squeezes them together. [1] The user applies a compressive gripping force at the far ends of the handles to operate the opener.
- Load: at the cutting wheel where it pierces and cuts through the metal can rim. [1] The resistance of the metal rim being punctured and sheared is the load force that the lever must overcome.
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