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Forces and Dynamics
Quick questions on Turning effect of forces and moments explained: O-Level Physics
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 moment of a force?Show answer
The moment of a force is its turning effect about a pivot. It equals the force times the perpendicular distance from the pivot to the line of the force:
What are the principle of moments?Show answer
When an object is balanced (in equilibrium) about a pivot, the total clockwise moment equals the total anticlockwise moment about that pivot:
What is conditions for equilibrium?Show answer
An object is in equilibrium when it has no resultant force and no resultant turning effect. The two conditions are:
What is wrong unit?Show answer
A moment is in newton metres (), not newtons.
What is q1?Show answer
Calculate the moment of a force acting from a pivot. [2 marks]
What is q2?Show answer
State the principle of moments. [2 marks]
What is q3?Show answer
Explain why a double-decker bus is designed with its heaviest parts low down. [2 marks]
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