Edexcel IGCSE Physics 復習筆記 1.4.3 Centre of Gravity
Edexcel IGCSE Physics 復習筆記 1.4.3 Centre of Gravity
Centre of Gravity
The centre of gravity of an object (sometimes called the centre of mass) is defined as:
The point through which the weight of an object acts
For a symmetrical object of uniform density, the centre of gravity is located at the point of symmetry
For example, the centre of gravity of a sphere is at the centre
The centre of gravity of a regular shape can be found by symmetry
The centre of gravity of an irregular object can be found by locating its balance point
A broomstick has a centre of gravity slightly closer to the head of the broom since there is more mass located there
The centre of mass of a broomstick which is also its balance point
Exam Tip
Since the centre of gravity is a hypothetical point, it can lie inside or outside of a body. The centre of gravity will constantly shift depending on the shape of a body. For example, a human body’s centre of gravity is lower when learning forward than when stood uprightHowever, make sure that when you are drawing force diagrams to draw the forces as if they were acting on the centre of gravity of the object!
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