4.2 Centre of Mass
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4 Terms
What is the centre of mass in an object?
A point through which any externally applied force produces straight line motion but no rotation.
It's an imaginary point where the entire weight of an object appears to act.
What is the centre of gravity?
The point through which the resultant gravitational force on the object, its total weight W will act.
How can you find the centre of gravity of an object?
A freely suspended object will come to rest with its centre of gravity vertically below the point of suspension?
Describe the method used to find the centre of gravity of an object?
A plumb-bob is suspended from a piece of string, when it comes to rest the string is vertical.
Make small holes along the edges of the object made from card. Insert a pin through one of the holes and hold the pin firmly in a clamp. Allow the object to swing freely and come to rest with its centre of gravity vertically below the pin. Hang a plumb line from the pin and draw a line along the vertical string of the plumb line. Repeat with other holes. The centre of gravity will be the point of intersection.