An Introduction to Mechanisms

1 Homework Tasks

Task 1: Research It

i) Find two examples for each of the three classes of lever (6 examples in total), then explain for each which class lever they are (2 of each class lever).

ii) Now find an image of 1 example for each class of lever above (3 in total) and label where the fulcrum/pivot, effort and load are.

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Task 2: Calculate It

Calculate the answers to the following problems involving gear ratios:
A driver pulley has a diameter of 200mm and rotates with a speed of 30rpm. Calculate the speed of a driven pulley with a diameter of 100mm.
A driver pulley has a diameter of 80mm and rotates with a speed of 50rpm. Calculate the speed of a driven pulley with a diameter of 100mm.
A driver pulley has a diameter of 50mm and rotates with a speed of 10rpm. Calculate the required diameter of a driven pulley if we want it to rotate at 50rpm.

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