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13 Cards in this Set
- Front
- Back
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Scalar Quantities
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Have only magnitude (size), no direction.
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Vector Quantities
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Have magnitude and direction.
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Resultant Force
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Two vectors meeting at a point may be added (or combined) to give a resultant.
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Equilibrium
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The state in which a body is not changing in position, composition, shape, or movement.
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Centre of Mass
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This is the position inside or outside a body at which the total mass of the body appears to act. A force can be applied without the object rotating. Centre of Mass and Centre of Gravity are the same.
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Coplanar Forces
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When the lines of action are all in the same plane.
They may be parallel, anti-parallel, or non-parallel. |
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Parallel Forces
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The lines of action are parallel and the directions are the same.
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Anti-parallel Forces
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The lines of action are parallel but, the directions are opposite to each other.
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Non-parallel Forces
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The forces are in the same plane but, are neither parallel or anti parallel
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Moment of Force
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The product of the force and the perpendicular distance of its line of action from the point. It measures the turning effect that the force will have about a point.
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Tension
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A pulling force.
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Principle of Moments
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If a system of coplanar forces keeps a body at rest, then the sum of the clockwise moments about any point in the plane of the forces equals the sum of the anticlockwise moments about the same point.
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Arm of The Moment
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The perpendicular distance from the turning point to the line of action of the force .
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