SS2: PHYSICS  1ST TERM

Scalars & Vectors  Week 15 Topics1 Quiz

Equations of Motion  Week 23 Topics1 Quiz

Projectile  Week 35 Topics

Equilibrium of Forces I  Week 44 Topics

Equilibrium of Forces II  Week 54 Topics

Stability of a Body  Week 64 Topics1 Quiz

Simple Harmonic Motion (SHM)  Week 74 Topics

Speed, Velocity & Acceleration & Energy of Simple Harmonic Motion  Week 85 Topics1 Quiz

Linear Momentum  Week 96 Topics1 Quiz

Mechanical Energy & Machines  Week 102 Topics1 Quiz
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Resultant & Equilibrant Forces
For a body to be in equilibrium, the sum of forces in one direction must be equal to the sum of the forces in the opposite direction.
From the force board experiment, the resultant R of two forces A and B acting at point O is found using the parallelogram method. It is found to be equal in magnitude but opposite in direction to the third force. This third force which is equal in magnitude but opposite in the direction of the resultant force is called equilibrant force, therefore,
A resultant force is that single force that acts alone and has the same effect in magnitude and direction as two or more forces acting together.
An equilibrant force is a single force which will balance all other forces taken together. It is equal in magnitude but opposite in direction to the resultant force.
If F_{1}, F_{2}, and F_{3} are in equilibrium, F_{1} is the equilibrant of F_{2} and F_{3}, F_{3} is the equilibrant of F_{1} and F_{2}, F_{2} is the equilibrant of F_{1} and F_{3}.
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