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| MECHANISMS EXAMINATION QUESTION | |
| V. Ryan © 2004 - 2009 | |
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The diagram below shows a design for a simple mechanism which moves piston X forwards and backwards inside the cylinder. It is part of a type of internal combustion engine. |
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1. Piston X moves backwards and forwards, what type of motion is this? |
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| Reciprocating motion | |
| 2. What is a movable pivot? | |
| The pivot is a centre of movement. A part or point about which something turns. | |
| 3. Place labels on the diagram to show the position of two moving pivots. | |
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4. Engineers have found that as the system rotates there is a problem with the mechanism. In the space below describe the problem. |
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| As the rotating shaft rotates it pushes the rod forwards and backwards. However, eventually the rod smashes against the cylinder and the mechanism stops suddenly. | |
| 5. In the space below draw a solution to the problem. | |
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DIAGRAM SHOWING THE PROBLEM |
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SOLUTION TO THE PROBLEM |
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Widen the cylinder, allowing the rod to pass backwards and forwards without 'smashing into the cylinder walls. |
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6. Internal combustion engines are linked to pollution. What type of pollution do they create. |
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| Internal combustion engines emit carbon monoxide and other polluting gases. | |
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