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Conceptual Newton's Law's Questions - HS Freshman Physics
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[QUOTE="SkyrimKhajiit, post: 4952212, member: 536179"] NOTE: The following questions are not part of any homework assigned. This is part of finding extra concept-related questions to help me study for my physics unit test. [B]Homework Statement [/B] I have conceptual questions, not problems. I'll provide sufficient evidence that I've attempted to think about them. 1. A boy seems to fall backward in an accelerating bus. What property does this illustrate? [LIST] [*]I'm honestly swaying between the law of inertia and the third law. [/LIST] [LIST] [*]I'm thinking law of inertia because the boy is resisting, then "non resisting" a change in motion... [/LIST] [LIST] [*]But I'm thinking third law because the bus is moving forward and the boy is falling backward. (Sorry if this is an obvious question.) [/LIST] 2. What is the difference between inertial and noninertial reference frames? [LIST] [*]Just a question about vocabulary terms. I know that inertia is the tendency for objects to resist a change in motion. Would non-inertial mean that the object doesn't experience as much inertia, or no inertia at all? [/LIST] 3. A fisherman stands in a boat that is moving forward toward a beach. What happens to him when the boat hits the beach? [LIST] [*]Thinking that it may have to do with Newton's third law (i.e. when boat hits dock, fisherman falls back)? [/LIST] [LIST] [*]Is this a trick question or more obvious than it seems :D ? [/LIST] 4. A passenger sits in a stationary train. There are some objects on a table: an apple, a box of candy, and a can of soda. What happens to all these objects with respect to the passenger when the train accelerates forward? [LIST] [*]Of course the objects fall backward, but why? [/LIST] [LIST] [*]Is it the third law acting again? As the train accelerates forward, the passenger and his objects move back... [/LIST] [LIST] [*]BUT: "what happens to all these objects [B]with respect to the [/B][I][B]passenger[/B][/I]"; is this a trick question, leading me to believe that the passenger is facing the back, instead of the front of the bus? [/LIST] 5. A rock is thrown vertically upward and stops for an instant at its highest point. Is the rock in equilibrium at this point? Are there forces acting on it? [LIST] [*]This one threw me off - the object isn't moving, but there is a force of gravity/air resistance? [/LIST] [LIST] [*]This led me to the next question... [/LIST]6. Is it possible for an object to have a zero acceleration and zero velocity when only one force acts on it? [LIST] [*]Not sure if it's completely relevant, but I remember a question that asked if an object could have a zero velocity and non-zero acceleration, and found that at an object's peak, the acceleration would be non-zero and the velocity would be 0. [/LIST] [LIST] [*]Now on to this question, I'm thinking as hard as I can to think of an example in which there is zero acceleration/velocity with only ONE force acting on it. [/LIST] [LIST] [*]All I can think of is if the force is equal to 0, but this obviously wouldn't be possible [/LIST] 7. Two boys are pulling a spring scale in opposite directions. What is the reading of the spring scale if each boy applies a force of 50N? [LIST] [*]Our class hasn't really covered spring forces/Hooke's laws other than in free-body diagrams, but I'm still curious about this. [/LIST] [LIST] [*]50+50=100N? [/LIST] [/QUOTE]
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