What is a vector?, A vector is a physical quantity that has both magnitude and direction., Is force a scalar or a vector?, Force is a vector quantity., What is the resultant force?, The resultant force is the single force that has the same effect on an object as all the individual forces acting on it combined., How do you add two forces at right angles?, Two forces acting at right angles can be added by: Drawing a vector triangle (using the head-to-tail method), or Applying Pythagoras’ theorem to calculate the magnitude of the resultant force., What does equilibrium mean?, A body is in equilibrium when both the resultant force and the resultant moment (torque) acting on it are zero., How can a force be resolved?, , What is the centre of gravity of a body?, The centre of gravity of a body is the point at which the entire weight of the body may be considered to act., Define the moment of a force, The moment of a force is the product of the force and the perpendicular distance from the pivot (or axis of rotation) to the line of action of the force. , State the principle of moments, For a body in equilibrium, the sum of the clockwise moments about any point is equal to the sum of the anticlockwise moments about that same point., What is a couple?, A couple is a pair of equal and opposite forces that are parallel but act along different lines, separated by a distance., Define torque of a couple, Torque of a couple = one of the forces × perpendicular distance between the forces., What are the two conditions for equilibrium?, For a body to be in equilibrium, both of the following conditions must be satisfied: 1-The resultant force acting on the body is zero. 2-The resultant moment (torque) about any point is zero..

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