![]() ![]() Consider someone in a rotating space habitat. What is the law of inertia for rotating systems in terms of angular momentum? Angular momentum does not change without an applied external torque. Angular momentum depends on the distribution of mass, whereas linear momentum depends on the total mass. Rotate a cylinder to create centrifugal force as viewed by a person on the inside of the curved outer wallĪll of the above Distinguish between linear momentum and angular momentum. How can gravity be simulated in an orbiting space station? Spin a station shaped like a bicycle wheel Instead, it is a force that only appears in an accelerating frame of reference. Why is centrifugal force in a rotating frame called a "fictitious force"? It is not a fundamental force of nature. quadruples the tension in the string When you whirl a can at the end of a string in a circular path, what is the direction of the force you exert on the can? Toward the center of the circle If the string that holds a whirling can in its circular path breaks, what kind of force causes it to move in a straight- line path: centripetal, centrifugal, or no force? What law of physics supports your answer? No force Newton's first law If you are not wearing a seat belt in a car that rounds a curve, and you slide across your seat and slam against a car door, what kind of force is responsible for your slide: centripetal, centrifugal, or no force? There is no force as viewed by someone outside the car. When a rock tied to a string is whirled in a horizontal circle, doubling the speed _. Why doesn't the Leaning Tower of Pisa topple over? A vertical line through the center of gravity passes inside its support base. Surely that string won't cause them to suddenly fall faster, so totally smooshing them together should also not change how fast they fall, because you can still think of them as two blobs that just happen to be connected together.What is the relationship between the center of gravity and the support base for an object that is in stable equilibrium? A vertical line through the center of gravity must pass inside the support base of the object. Now connect the blobs together with a light string and again drop them at the same time. Also, consider that two identical blobs released at the same time will fall at the same rate that a single blob, by itself, will fall. So the two blobs, now in the form of one blob, still push with 2 Newtons. You haven't changed anything about the two blobs of clay except they are stuck together. Now smoosh those two blobs of clay together so that its now one big blob and keep the big blob on the scale. The downward force will be 2 Newtons because force is additive-the total force is the sum of the forces from each blob (as long as the force is in the same direction, of course). Now let's say we get another blob of clay identical to the first and add it to the scale along with the first blob of clay, so there are two blobs of clay on the scale. ![]() I'm not sure exactly what you are asking, but this may help: Let's say gravity causes a blob of clay to push downward on a weight scale with a force of 1 Newton. ![]() In this case, the force is really $$|F|=G\frac$, I'm just talking about the magnitude $\tau=rF\sin\phi$. ![]() The reason that objects tend to fall at the same rate is because on earth we can approximate the force of gravity to be $F=mg$. ![]()
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