1,246 prompts matching "Set theory laws: commutative and associative"
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Practice: Why the forces must sum to nought in two perpendicular directions
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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: Finding an unknown force from a closed polygon
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Quiz: The coefficient of friction between two surfaces
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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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Worked Example: The total moment of three parallel forces about one end
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Learn: The algebraic sum of moments when the senses differ
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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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Spot My Mistake: Finding two unknown tensions from three forces in equilibrium
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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: Why the probabilities in a distribution must sum to one
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Worked Example: Finding a particular term of a binomial expansion
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Learn: Finding the coefficient of a stated power in an expansion
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Practice: Using a binomial expansion to approximate a number
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