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SS2: PHYSICS - 1ST TERM

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  1. Scalars & Vectors | Week 1
    5 Topics
    |
    1 Quiz
  2. Equations of Motion | Week 2
    3 Topics
    |
    1 Quiz
  3. Projectile | Week 3
    5 Topics
    |
    1 Quiz
  4. Equilibrium of Forces I | Week 4
    4 Topics
  5. Equilibrium of Forces II | Week 5
    4 Topics
    |
    1 Quiz
  6. Stability of a Body | Week 6
    4 Topics
    |
    1 Quiz
  7. Simple Harmonic Motion (SHM) | Week 7
    4 Topics
  8. Speed, Velocity & Acceleration & Energy of Simple Harmonic Motion | Week 8
    5 Topics
    |
    1 Quiz
  9. Linear Momentum | Week 9
    6 Topics
    |
    1 Quiz



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Topic Content:

  • Definition of Centre of Gravity
  • Determine the Position of the Centre of Gravity of an Irregular Object
    • Use of a Plumbline
    • Using the Balancing Method
  • Determining the Weight of an Object by the Principle of Moments

The Centre of gravity of a body is the point at which the total weight of a body appears to be concentrated.

or

The Centre of gravity of a body is the point at which the total weight of a body appears to pass through.

Centre of mass of a body is the point at which the total mass of a body appears to pass through or concentrated.

The Centre of gravity for objects varies as shown below.

C.GFor a Uniform rod, the centre of gravity
is at the mid-point of the centre rule.
Screenshot 2022 07 06 at 00.29.33For a Uniform Circular Plate, the centre
of gravity is at the mid-point of the circular
plate.
Screenshot 2022 07 06 at 00.34.30For a Uniform Circular Ring, the centre of
gravity is at the centre of the ring.
Screenshot 2022 07 06 at 00.37.11For a Uniform Rectangular Sheet, the centre
of gravity is at the point of intersection of
the diagonals.
Screenshot 2022 07 06 at 00.45.30For a Uniform Triangular Plate, the centre
of gravity is at the point of intersection of
the medians.

Determine the Position of the Centre of Gravity of an Irregular Object:

The centre of gravity of irregular-shaped objects can be determined by suspension with a plumb line from two or more points or by balancing the body on a knife-edge.

 

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