716 prompts matching "Quiz: Subtracting one surd from another"
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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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Learn: Choosing the point about which to take moments
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Worked Example: Drawing the polygon of forces to scale
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Learn: What an unclosed polygon of forces tells you
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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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Spot My Mistake: The moment of a force whose line of action is not perpendicular
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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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Learn: The algebraic sum of moments when the senses differ
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Explain Back: Locating the point of concurrence on a diagram
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Spot My Mistake: Using concurrence to find the direction of an unknown third force
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Practice: Resolving three forces in two perpendicular directions
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Worked Example: Matching each force to the sine of the angle opposite it
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Learn: Finding two unknown forces by Lami's theorem
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Spot My Mistake: When Lami's theorem may be used, and when it may not
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Explain Back: A probability distribution table for a discrete random variable
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Learn: The expectation of a discrete random variable
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