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instant.","mcqOptions":null},{"id":"a2a125f7-3267-4f40-a642-9cc72f9d4c47","cardType":"basic","points":2,"front":"Can a system with no relative motion between its components accelerate relative to the ground?","back":"Yes - no relative motion only concerns movement between components.","mcqOptions":null},{"id":"dba897d0-f3ed-4a8c-a279-6cb2032ef7e0","cardType":"cloze","points":null,"front":"The mass used in the single-particle model is $\\text{[...]}$.","back":"The mass used in the single-particle model is $\\boxed{m_{\\text{system}}=m_1+m_2+\\cdots+m_n}$.","mcqOptions":null},{"id":"df63ec31-6e0a-4617-b89f-5ff8371f53a6","cardType":"basic","points":1,"front":"Which forces are included when applying Newton's second law to a complete system?","back":"Only the external forces acting on the system.","mcqOptions":null},{"id":"745f2f92-439a-4f93-b6e2-86d4ca8cc68c","cardType":"cloze","points":null,"front":"For components moving together, Newton's second law becomes $\\text{[...]}$.","back":"For components moving together, Newton's second law becomes $\\boxed{F_{\\text{external}}=m_{\\text{system}}a}$.","mcqOptions":null},{"id":"f5611b8d-ac8d-40a3-820f-1ffcaf266d81","cardType":"basic","points":2,"front":"Why do internal forces disappear from a whole-system equation?","back":"Their equal and opposite pairs cancel.","mcqOptions":null},{"id":"fde51e29-cbc2-4c0f-ae91-d40471ecd80f","cardType":"basic","points":1,"front":"When two touching blocks are treated as one system, how is their contact force classified?","back":"It is an internal force.","mcqOptions":null},{"id":"447cb78f-52bf-4497-8052-f333429c78a8","cardType":"basic","points":1,"front":"When a lift and its passengers form one system, how is the force between the passengers and floor classified?","back":"It is an internal force.","mcqOptions":null},{"id":"8a422ef6-a4f4-4637-826b-aaa24b2de45c","cardType":"cloze","points":null,"front":"Before resolving forces, choose a [ ]; forces opposite to it are negative.","back":"Before resolving forces, choose a positive direction; forces opposite to it are negative.","mcqOptions":null},{"id":"e4f20281-a87c-4fd1-8de8-8da3c6b18b5a","cardType":"basic","points":1,"front":"What system should usually be chosen to find the common acceleration of connected objects?","back":"Include every component moving together.","mcqOptions":null},{"id":"c04cd516-4f1b-4a72-861b-ac4c43cc3d7f","cardType":"basic","points":2,"front":"What system should be chosen to find a contact force between two components?","back":"Isolate one component so the contact force becomes external.","mcqOptions":null},{"id":"d9f1780d-3590-4437-97b1-71c7b2f0fa24","cardType":"basic","points":1,"front":"Two crates of masses 8 kg and 12 kg move together. What mass is used in the single-particle model?","back":"$20\\text{ kg}$.","mcqOptions":null},{"id":"e8cf66bd-0b16-49ea-a425-5efa039a780b","cardType":"basic","points":1,"front":"The 8 kg and 12 kg crates have coefficient of friction 0.2. What is their total friction?","back":"$39.2\\text{ N}$, using $F=0.2(20g)$.","mcqOptions":null},{"id":"c59c06fb-adfa-40eb-8e89-6d30e7668c10","cardType":"cloze","points":null,"front":"For the two crates, the resultant horizontal force is $\\text{[...]}$.","back":"For the two crates, the resultant horizontal force is $\\boxed{120-39.2=80.8\\text{ N}}$.","mcqOptions":null},{"id":"130ece6d-f99b-4c30-8ec6-aba9bdf0cda8","cardType":"basic","points":2,"front":"A resultant force of 80.8 N acts on the combined 20 kg crates. Find their acceleration.","back":"$4.04\\text{ m s}^{-2}$.","mcqOptions":null},{"id":"a57777fa-df3e-46bf-ad90-4e421389880d","cardType":"basic","points":1,"front":"A lift of mass 600 kg carries 150 kg of passengers. What total mass is used?","back":"$750\\text{ kg}$.","mcqOptions":null},{"id":"56c33543-38d7-4b5c-bce6-934922650bc0","cardType":"basic","points":2,"front":"A 750 kg lift system has tension 8100 N. Taking upwards as positive, find its acceleration and direction.","back":"$1\\text{ m s}^{-2}$ upwards.","mcqOptions":null},{"id":"be1ebe7c-6e35-4823-923f-5fc98851e6cc","cardType":"cloze","points":null,"front":"To test whether stacked blocks move together, compare the [ ] with the maximum available friction.","back":"To test whether stacked blocks move together, compare the required friction with the maximum available friction.","mcqOptions":null},{"id":"b8032896-1051-4c3c-82ff-d7a1b3ef3348","cardType":"basic","points":2,"front":"A 30 N force acts on two proposed combined blocks of masses 2 kg and 8 kg. What common acceleration is assumed?","back":"$3\\text{ m s}^{-2}$.","mcqOptions":null},{"id":"1c888d36-f2a9-4ce4-bde9-a861a826165f","cardType":"basic","points":2,"front":"What friction is required to accelerate the 2 kg upper block at $3\\text{ m s}^{-2}$?","back":"$6\\text{ N}$.","mcqOptions":null},{"id":"5b4bf562-9067-48a0-ad5c-b4e4ff9d4f91","cardType":"cloze","points":null,"front":"For the 2 kg upper block with $\\mu=0.25$, the maximum friction is $\\text{[...]}$.","back":"For the 2 kg upper block with $\\mu=0.25$, the maximum friction is $\\boxed{F_{\\max}=0.25(2g)=4.9\\text{ N}}$.","mcqOptions":null},{"id":"9d6caa6e-754c-4ed0-9a19-b50cfc06e7ac","cardType":"basic","points":2,"front":"The required friction between two blocks is 6 N, but the maximum is 4.9 N. 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