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Rev. Notes > IGCSE > Forces
Previous Topic Forces Next Topic

Force Effect of force Friction
Balanced forces Unbalanced forces Addition of forces
Newton's firts law of motion Newton's second law of motion Newton's third law of motion
Circular motion Circular motion - Examples Center of mass
Hook's law Hook's law (Elastic behaviors) Hook's law (Plastic behaviors)
Hook's law - Elastic limit Effects of applied force on the materials Moment of force
Priciple of moment of force Equilibrium Conditions of equilibrium

Addition of forces

If two or more forces are pulling or pushing an object in the same direction the the effect of the forces will add up.

If the forces pulling it in opposite directions then the backwards forces can be subtracted.

If two forces are pulling an object in different direction, then their resultant can be found by using graphs.

To calculate the single (resultatnt) force we draw the two forces in the correct direction and to a scale length that is suitable. e.g.

1 cm = 10 N or 1 cm = 5 N or 1 cm = 20 N etc. (depends on the size of force)

Then we can find the resultant by completing the parallelogram.

Then the resultant is the diagonal line across the parallelogram between the two forces.

This gives the direction of resultant force and the magnitude is given by the length of the line.


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View Comments on this Chapter - Total Comments (5)
wweerre Said :
all r coooo
  15/08/14 09:04 AM
Aroosha Pervaiz Said :
spend plumb line 4rm whr it is hanged upp
  21/04/13 03:43 PM
Aroosha Pervaiz Said :
  21/04/13 03:40 PM
Aroosha Pervaiz Said :
@ghost the point from where it is hanged up
  26/01/13 04:36 PM
Ghost Said :
Could you explain this :Suspend a plumb line from the same place. Thanks for your help.
  11/05/12 06:08 AM


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