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Physics 1021 Quiz: Reading Material Quiz Answers - Fall.docx

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School
Western University
Department
Physics
Course
Physics 1021
Professor
Martin Zinke- Allmang

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Document Summary

Forces (mc-01-ad-001) physics is applied to biological and physiological systems both at a macroscopic and at a microscopic level. The textbook provides reference to both; we study the effect of gravity on the otoliths in the macula of the inner ear and we study the effect of gravity on the entire human body. This is possible as the attached illustrates and many examples in the textbook rely on this approach. In the attached figure we consider the three forces t, Warm and f. which of the three forces in the figure is/are contact forces: all three forces, t and warm, t and f, warm and f. Answer key: c (mc-01-ad-002) physics is applied to biological and physiological systems both at a macroscopic and at a microscopic level. In the figure we consider the three forces t, warm and f. the dumbbell has a weight wdumbbell.

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Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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Related Questions

The large quadriceps muscle in the upper leg terminates at its lower end in a tendon attached to the upper end of the tibia (Fig. P8.27a). The forces on the lower leg when the leg is extended are modeled as in Figure P8.27b, where vector T is the force of tension in the tendon, vector w is the force of gravity acting on the lower leg, and vector F is the force of gravity acting on the foot. Find vector T when the tendon is at an angle of 25.0° with the tibia, assuming that ? = 40.0 N, F = 13.5 N, and the leg is extended at an angle ? of 40.0° with the vertical. Assume that the center of gravity of the lower leg is at its center, and that the tendon attaches to the lower leg at a point one fifth of the way down the leg.

This problem introduces the concept of tension. The example is a rope, oriented vertically, that is being pulled from both ends. Let Fu and Fd (with u for up and d for down) represent the magnitude of the forces acting on the top and bottom of the rope, respectively. Assume that the rope is massless so that its weight is negligible compared with the tension. (This is not a ridiculous approximation-modern rope material such as Kevlar can carry tensions thousands of times greater than the weight of tens of meters of such rope.)

Consider the three sections of rope labeled a, b, and c in the figure.

  • At point 1, a downward force of magnitude Fad acts on section a.
  • At point 1, an upward force of magnitude Fbu acts on section b.
  • At point 1, the tension in the rope is T1.
  • At point 2, a downward force of magnitude Fbd acts on section b.
  • At point 2, an upward force of magnitude Fcu acts on section c.
  • At point 2, the tension in the rope is T2.

(A) What is the magnitude Fad of the downward force on section a?

(B) What is the magnitude Fbu of the upward force on section b?

(C) The magnitude of the upward force on c, Fcu, and the magnitude of the downward force on b, Fbd, are equal because of which of Newton's laws?

(D) The magnitude of the force Fbu is ______ Fbd.

(E) Now consider the forces on the ends of the rope. What is the relationship between the magnitudes of these two forces?

(a) Fu > Fd

(b) Fu = Fd

(c) Fu < Fd

(F) The ends of a massless rope are attached to two stationary objects (e.g., two trees or two cars) so that the rope makes a straight line. For this situation, which of the following statements are true?

(a) The tension in the rope is everywhere the same.

(b) The magnitudes of the forces exerted on the two objects by the rope are the same.

(c) The forces exerted on the two objects by the rope must be in opposite directions.

(d) The forces exerted on the two objects by the rope must be in the direction of the rope.

A lunch tray is being held in one hand, as the figure illustrates (I will explain). The mass of the tray itself is 0.214 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.20 kg plate of food and a 0.239 kg cup of coffee. Obtain (a) the force T exerted by the thumb and (b) the force F exerted by the four fingers. Both forces act perpendicular to the tray, which is being held parallel to the ground. The person's right hand is shown with the thumb on top and all other fingers on the bottom or the tray. A vertical line is drawn as where ALL the measurements are made to (with arrows pointing out to it) from the base of the thumb upward. The following values are labeled: from this line to horizontal distance over to the thumbnail = 0.0600m, from this line to index fingernail = 0.100m, from this line over to middle of plate = 0.240m, from this line over to middle of coffee cup = 0.380m, and from this line over to the other line way to the right which is at the right edge of the coffee cup AND end of tray = 0.400m. The force F is labeled pointing up from the index finger (and all other fingers are hiding behind it). The force T is labeled pointing down from the thumb.