1,334 prompts matching "A binary operation that is ordinary addition in disguise"
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Worked Example: Checking the solution of three equations by substitution
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Practice: The value of g used in Nigerian examination papers
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Explain Back: The resultant of two forces acting in the same straight line
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Spot My Mistake: The greatest and the least resultant of two given forces
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Quiz: Recovering the original force from its two components
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Practice: Choosing the most convenient pair of directions to resolve along
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Worked Example: Marking the weight, the normal reaction and the friction on a diagram
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Explain Back: The forces acting on a body hanging from two strings
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Worked Example: Using the sine rule on the triangle of forces
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Explain Back: The order in which the forces are drawn round the triangle
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Practice: Why the forces must sum to nought in two perpendicular directions
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Explain Back: Why the total moment about any point must be nought
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Worked Example: Drawing the polygon of forces to scale
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Practice: Finding an unknown force from a closed polygon
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Practice: Limiting friction, and the greatest value it can reach
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Spot My Mistake: Why friction does not depend on the area of contact
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Worked Example: The moment of a force about a point on its own line of action
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Explain Back: The units of a moment, and why they are newton metres
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Explain Back: Locating the point of concurrence on a diagram
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Quiz: A rod resting against a wall, and the concurrence of its three forces
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