nts in static contexts (A-level only) Flashcards","topicId":"26c82d73-a69f-4712-98c1-58af89f57e9c","topicSlug":"moments-in-static-contexts","cards":[{"id":"0ec5abde-d934-4b71-b53f-ce6daee12d1a","cardType":"basic","front":"Why does a force acting through a pivot have zero moment about it?","back":"Its perpendicular distance from the pivot is zero.","points":2,"mcqOptions":null},{"id":"4d52046b-ff43-43d1-9fa4-2894aecfab0a","cardType":"cloze","front":"The magnitude of a moment is given by $\\text{[...]}$.","back":"The magnitude of a moment is given by $\\boxed{M=Fd}$.","points":null,"mcqOptions":null},{"id":"26663898-1f7f-4034-9e03-6d26c10811c2","cardType":"basic","front":"What are the units of a moment?","back":"N m","points":1,"mcqOptions":null},{"id":"ade363a4-432a-4ab2-a97e-9de7e228f652","cardType":"cloze","front":"In $M=Fd$, $d$ is the [ ].","back":"In $M=Fd$, $d$ is the shortest perpendicular distance to the force's line of action.","points":null,"mcqOptions":null},{"id":"9a9db47c-d914-4301-a822-43f7c2ec8194","cardType":"basic","front":"What determines whether a moment is clockwise or anticlockwise?","back":"The direction the force would turn the object about the fixed pivot.","points":1,"mcqOptions":null},{"id":"fe80eaa2-5bb2-489a-a5df-0bfdd90df6e2","cardType":"cloze","front":"Before calculating a moment in N m, $40\\text{ cm}$ must be converted to $\\text{[...]}$.","back":"Before calculating a moment in N m, $40\\text{ cm}$ must be converted to $\\boxed{0.4\\text{ m}}$.","points":null,"mcqOptions":null},{"id":"b6d5bae7-2880-4fe8-9834-8c737fa2b9ba","cardType":"basic","front":"An 18 N force acts perpendicularly 0.7 m from a pivot. Find its moment magnitude.","back":"$12.6\\text{ N m}$","points":2,"mcqOptions":null},{"id":"364ae198-f38c-4dd4-abf9-e1a73ec63859","cardType":"basic","front":"What two conditions are required for static equilibrium?","back":"

Resultant force is zero.
Resultant moment about any point is zero.

","points":3,"mcqOptions":null},{"id":"3bbe17a2-dfc1-42ca-96e3-939901bcf9f2","cardType":"cloze","front":"For an object in equilibrium, $\\text{[...]}$.","back":"For an object in equilibrium, $\\boxed{\\text{total clockwise moments}=\\text{total anticlockwise moments}}$.","points":null,"mcqOptions":null},{"id":"25ba2d5d-71f4-4e47-be2c-c3ad372dd3f1","cardType":"basic","front":"Why does balancing moments alone not prove complete equilibrium?","back":"The resultant force could still be non-zero.","points":2,"mcqOptions":null},{"id":"8b3a6c42-22f4-4690-ad24-e715137ce1dc","cardType":"basic","front":"Why is it useful to take moments about a support?","back":"Any unknown force through the support has zero moment.","points":2,"mcqOptions":null},{"id":"18da507f-34f0-4107-afdb-ae199f77119b","cardType":"basic","front":"A 30 N downward force acts 2 m left of a pivot. What downward force 1.5 m right balances it?","back":"$40\\text{ N}$","points":2,"mcqOptions":null},{"id":"3680d45a-7e15-4127-8a3b-e74500a76659","cardType":"cloze","front":"For a force $F$ acting at distance $r$ and angle $\\theta$ to a rod, the moment magnitude is $\\text{[...]}$.","back":"For a force $F$ acting at distance $r$ and angle $\\theta$ to a rod, the moment magnitude is $\\boxed{M=rF\\sin\\theta}$.","points":null,"mcqOptions":null},{"id":"f91883b2-713e-41cd-945b-6f881f7035ad","cardType":"basic","front":"Compare the moments produced by a force parallel and perpendicular to a rod.","back":"

Parallel force: zero moment.
Perpendicular force: maximum moment.

","points":3,"mcqOptions":null},{"id":"f1db1852-54e5-49a5-ab2a-52ab2b579edd","cardType":"basic","front":"A 50 N force acts at the end of a 0.8 m rod at $30^\\circ$ to it. Find the moment magnitude.","back":"$20\\text{ N m}$","points":2,"m

3.4.1 Moments in static contexts (A-level only) Flashcards

3.4.1 Moments in static contexts (A-level only) Flashcards