CAIE A-Level Physics 4.1.1 Centre of Gravity
Practise representing an object’s weight at its centre of gravity and using that location to analyse balance, support and turning.
- Syllabus
- 2028–2030
- Course
- Physics 9702
- Level
- AS
Exam points
- Represent the weight of an object as acting at its centre of gravity.
- Use the centre-of-gravity concept to analyse balance, support or turning situations.
- Interpret the location and effect of the weight force in a stated physical system.
4.1.1—The weight of an object may be taken as acting at a single point known as question 1
The cylinder in (a) is hung from the end A of a non-uniform bar AB , as shown in Fig. 3.1.
Fig. 3.1
The bar has length 50 cm and has weight 0.25 N . The centre of gravity of the bar is 20 cm from B. The bar is pivoted at P. The pivot is 12 cm from B.
An object X is hung from end B. The weight of X is adjusted until the bar is horizontal and in equilibrium.
Explain what is meant by centre of gravity.
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