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Mechanisms and Structures
Quick questions on Levers and linkages: N(A)-Level Design and Technology
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the three classes of lever?Show answer
The class depends on what lies in the middle:
What are the principle of moments?Show answer
A moment is the turning effect of a force:
What are linkages?Show answer
A linkage is a set of connected bars (links) that pass on or change motion. Linkages can reverse the direction of a movement (a reverse-motion linkage), change push into a turn, or move two points together. They let a single input control movement in a chosen direction, useful in toys, tools and folding products.
What is not setting moments equal for balance?Show answer
To find an unknown distance or force, set clockwise moments equal to anticlockwise moments.
What is q1?Show answer
State the formula for the moment of a force. [1 mark]
What is q2?Show answer
A force of 20 N acts 0.5 m from a pivot. Calculate the moment. [2 marks]
What is q3?Show answer
A 200 N load sits 0.3 m from a pivot. What effort is needed 0.6 m from the pivot to balance it? [3 marks]
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