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SingaporeDesign and Technology

Mechanisms and Structures

3 dot points across 3 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How do gears and pulleys change the speed and direction of rotation, and how do you calculate a gear ratio?

Describe how gears, pulleys and belts transmit motion, and calculate gear ratios to find changes in speed
A clear answer to the N(A)-Level D&T outcome on gears and pulleys. How gear trains and belt-and-pulley systems change speed and direction, the idler gear, and calculating a gear ratio from the number of teeth.
8 min answer →

How do levers let a small effort move a large load, and how do you calculate the turning effect?

Describe the three classes of lever and use the principle of moments to calculate the turning effect of a force
A clear answer to the N(A)-Level D&T outcome on levers. The three classes of lever, how linkages change direction of motion, and using the principle of moments to calculate the turning effect of a force.
8 min answer →

What makes a structure strong and stable, and how can a designer stop it from collapsing or tipping?

Describe how structures resist forces and stay stable, using techniques such as triangulation and a low, wide base
A clear answer to the N(A)-Level D&T outcome on structures. Forces of tension and compression, making structures strong through triangulation and material shape, and keeping them stable with a low centre of gravity and a wide base.
8 min answer →