Quiz_ Reading_ Particle Kinetics Using Work and Energy

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Apr 3, 2024

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3/11/24, 9:44 AM Quiz: Reading: Particle Kinetics Using Work and Energy: ENGR240: Dynamics (001) https://canvas.liberty.edu/courses/601780/quizzes/2671240?module_item_id=60442959 1/7 Quiz: Reading: Particle Kinetics Using Work and Energy Due Mar 1 at 11:59pm Points 14 Questions 14 Available Feb 14 at 12am - Mar 1 at 11:59pm Time Limit 60 Minutes Instructions This quiz was locked Mar 1 at 11:59pm. Attempt History Attempt Time Score LATEST Attempt 1 49 minutes 13 out of 14  Correct answers are hidden. Score for this quiz: 13 out of 14 Submitted Feb 19 at 9:37pm This attempt took 49 minutes.  Question 1 1 / 1 pts Power Energy Conservative force Moment  The quiz: Covers the Textbook material from Module 5 (Chapter 14) . Contains 14 multiple-choice and true/false questions. Is limited to 60 minutes . Allows 1 attempt . Is worth 14 points . _________________________ is the capacity for doing work. Online Residential Athletics Sign In Request Info Apply Now Visit Us Create Guest Account

3/11/24, 9:44 AM Quiz: Reading: Particle Kinetics Using Work and Energy: ENGR240: Dynamics (001) https://canvas.liberty.edu/courses/601780/quizzes/2671240?module_item_id=60442959 2/7 Question 2 1 / 1 pts conservation of force nonconservative force frictional force conservative force The work done by a conservative force is independent of the path.  Question 3 1 / 1 pts conservation of mechanical energy principle of work and energy conservation of energy kinetic and potential energy equvalency It is either called conservation of mechanical energy or conservation of energy.  IncorrectQuestion 4 0 / 1 pts True If the work of a force is independent of the path and depends only on the force's initial and ±nal positions on the path, then the force is called _____________________. The equation T + V = T + V , where T , T and V , V are kinetic and potential energies at locations 1 and 2 along a path, respectively is called __________________________. (select all that apply) 1 1 2 2 1 2 1 2 The change in kinetic energy of a particle that displaced from position 1 to position 2 due to the resultant force F is always positive. R

3/11/24, 9:44 AM Quiz: Reading: Particle Kinetics Using Work and Energy: ENGR240: Dynamics (001) https://canvas.liberty.edu/courses/601780/quizzes/2671240?module_item_id=60442959 3/7 False This statement is wrong. Although kinetic energy of a particle at any location is always positive, the change can be either positive or negative depending on the energy at the initial and ±nal locations.  Question 5 1 / 1 pts True False Yes, the work done by a weight does depend only on the vertical displacement and not by the path.  Question 6 1 / 1 pts in the direction of the force. opposite to the direction of force. perpendicular to the direction of force. tangent to the path of the motion.  Question 7 1 / 1 pts d U = F d r The weight of a body is an example of conservative force. A force F will do work on a particle only when the particle undergoes a displacement _______________________. A force F is moving the particle along the path from position r to position r '. If the displacement vector is d r and its magnitude is ds, the work done on the particle mathematically is given by _________________________. ( Note: Bold face texts represent vectors)

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3/11/24, 9:44 AM Quiz: Reading: Particle Kinetics Using Work and Energy: ENGR240: Dynamics (001) https://canvas.liberty.edu/courses/601780/quizzes/2671240?module_item_id=60442959 4/7 d U = F x d r dU = F .ds dU = F .d r The work done (dU, which is a scalar) is given by the dot product of the force vector and the displacement vector, i.e., F .d r  Question 8 1 / 1 pts When the angle θ is 90 , the total work done on the particle will be zero. If 90 < θ ≤ 180 , the work done by the force will be negative. If 0 < θ ≤ 90 , the work done by the force will be positive. work is always positive. Work can be positive, negative, or zero depending on the angle between the force and the displacement vectors.  Question 9 1 / 1 pts Watt Kelvin Joule N.m.  Question 10 1 / 1 pts The work done on the particle is given by dU = F cos θ ds. Which of the following statement(s) is/are correct? Select all that apply. ο ο ο ο ο The unit of work is _______________________. (select all that apply)

3/11/24, 9:44 AM Quiz: Reading: Particle Kinetics Using Work and Energy: ENGR240: Dynamics (001) https://canvas.liberty.edu/courses/601780/quizzes/2671240?module_item_id=60442959 5/7 True False Yes, power is a scalar quantity.  Question 11 1 / 1 pts The area represents the distance a particle traveled from S to S . The area represents the work done by a force of magnitude F to move an object from S to S . If we know the function F cos θ of the curve, we can determine the area under the curve using the integral ∫ Fcos θ ds. The area under the curve is the total power consumed when a particle moves from S to S . The area under the curve is the work done on a particle to displace it from S to S . This work can be determined using the integral ∫ Fcos θ ds.  Question 12 1 / 1 pts The power generated by a machine is a scalar quantity. What can we say about the shaded area shown in the ±gure? (select all that apply. S stands for displacement) 1 2 1 2 1 2 1 2 Which of the following statement (s) is/are correct about work done by a particle's weight W ?

3/11/24, 9:44 AM Quiz: Reading: Particle Kinetics Using Work and Energy: ENGR240: Dynamics (001) https://canvas.liberty.edu/courses/601780/quizzes/2671240?module_item_id=60442959 6/7 If the particle moves up from S to S along the path due to the the weight, the work is negative. If the particle moves up from S to S along the path due to the the weight, the work is positive. If the particle moves down from S to S along the path due to the the weight, the work is negative. If the particle moves down from S to S along the path due to the the weight, the work is positive. Note that the direction of the weight is always downward. Work due to weight becomes positive only if the displacement is downward. In this case displacement becomes downward if the particle moves from S to S .  Question 13 1 / 1 pts principle of work. principle of energy. principle of momentum. principle of work and energy. 1 2 1 2 2 1 2 1 2 1 Suppose the resultant force F displaces a particle of mass m from location 1 to 2 along the path s. If the magnitudes of the velocities of the particle at positions 1 and 2 are respectively V and V , it can be shown that ∑ U = 1/2 (mV -mV ). This equation is represents ________________________. R 1 2 1-2 2 2 1 2

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3/11/24, 9:44 AM Quiz: Reading: Particle Kinetics Using Work and Energy: ENGR240: Dynamics (001) https://canvas.liberty.edu/courses/601780/quizzes/2671240?module_item_id=60442959 7/7 The equation relates the work done to the kinetic energy of the particle, and called the principle of work and energy.  Question 14 1 / 1 pts work energy momentum power Quiz Score: 13 out of 14 The dot product of force and velocity or F . V is called _______________.