SOLVED:Which of the following is NOT true for every possible motion involving a constant speed? (A) The magnitude of velocity is constant. (B) The object may be changing direction. (C) The acceleration is zero. (D) The magnitude of the net force acting on the object can be equal to or greater than zero. (E) The net work done on or by the object is zero.

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Chapter 2

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Video Transcript

so we can take an example off uniform circular motion. So let's let's assume that an object is moving in the uniform circular motion with, ah, constant speed. So even if the object is moving in a circular motion with the constant speed, the velocity is changing every moment because the velocity is the direction, Um, which makes a tangent at the point of the circle. So at each point, the attendant is different. So that's why the direction of the velocity exchanging. Although the magnitude remains constant, so the velocity is constant. In that case, option is true. No, the object is, as we mentioned, that changing the object is changing its direction. So that means auction bees true as well. But we'll come back to Option C because ax elation is not cereal here. So we have to see if that condition satisfies here or not. But we see that the centripetal force is the net force acting on the object, and that's greater than zero. So that means d seems to be true also from the work energy theorem. We see that since the object is moving so we only have kind of energy here and the the kinetic energy is changing. So the change in kinetic Sorry, the kind of again it is not changing here because the velocity is constant. So that means the next change in kinetic energy and the network are both zero. So that means he's through. So the only option that seems not true is option C where ax elation is here. So I mean, as we see here, that ax elation is nausea because the very sentimental acceleration which is acting towards the center, so the option C seems to be the answer.

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How much work is done by a pitcher in throwing a …

Problem 16 Hard Difficulty

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Video Transcript

Robert Jansen

Physics SAT Subject Test

Physics SAT Subject Test

Robert JansenPhysics SAT Subject Test

Robert Jansen

Physics SAT Subject Test