1,305 prompts matching "Surds that cannot be combined at all"
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Quiz: The magnitude of the resultant of several coplanar forces
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Practice: The direction of the resultant of several coplanar forces
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Worked Example: Marking the weight, the normal reaction and the friction on a diagram
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Learn: A space diagram and a force diagram drawn side by side
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Explain Back: The forces acting on a body hanging from two strings
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Spot My Mistake: Drawing the triangle of forces to scale to find an unknown force
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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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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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Practice: Finding an unknown force from a closed polygon
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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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Quiz: The point about which the total moment of a set of forces vanishes
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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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