10/3/21, 8:15 AM Alef Frontend View hints View feedback Play All Question 1 You extend a spring that is hanging vertically and then let go. Which statement best describes the spring’s motion? The spring returns straight to the position of zero displacement. The spring moves up and down around the position of zero displacement. The spring moves up and down between the release point and the position of zero displacement. The spring moves downward to the point of the maximum amplitude. Question 2 Drag and drop the correct values for each quantity. An external force extends a spring to 0.40 m. The spring constant of the spring is 25.0 N/m. Mahmoud uses this information to find the three quantities shown. Internal force developed in the spring: – 10.0 N https://moe.alefed.com/teacher/?1633234182121#/lessons/lesson/a382333d-fc41-4d5f-9e8d-000000030156/content/147b414e-8884-4ffa-916e-c869… 1/11 10/3/21, 8:15 AM Alef Frontend 10.0 N External force exerted on the spring: Work done on the spring: 2.5 J 2.00 J 4.00 J 2.00 N 12.5 N – 25.0 N Question 3 A weight attached to a spring is pulled down and then released. The graph shows vertical displacement as function of time. What does the graph indicate about the motion of the spring? It is a uniform rectilinear motion. It is a periodic motion with variable amplitude. It is a simple harmonic motion. https://moe.alefed.com/teacher/?1633234182121#/lessons/lesson/a382333d-fc41-4d5f-9e8d-000000030156/content/147b414e-8884-4ffa-916e-c869… 2/11 10/3/21, 8:15 AM Alef Frontend It is a driven oscillatory motion. Question 4 Which of the following represents the amplitude of the spring in simple harmonic motion? vertical displacement between point 2 and point 4 horizontal displacement between point 1 and point 4 vertical displacement between point 1 and point 2 horizontal displacement between point 3 and point 4 Question 5 https://moe.alefed.com/teacher/?1633234182121#/lessons/lesson/a382333d-fc41-4d5f-9e8d-000000030156/content/147b414e-8884-4ffa-916e-c869… 3/11 10/3/21, 8:15 AM Alef Frontend Select the correct word from the drop-down menu. Maya is asked to find the spring constant, k. She plots force vs. displacement of the spring on a graph and finds the slope of the line. Question 6 What property of a spring is represented by the spring constant? spring maximum elongation spring force spring length spring rigidity Question 7 Hooke’s law is used to describe the relationship between the internal force and displacement for a particular spring. Which equation is Hooke’s law? https://moe.alefed.com/teacher/?1633234182121#/lessons/lesson/a382333d-fc41-4d5f-9e8d-000000030156/content/147b414e-8884-4ffa-916e-c869… 4/11 10/3/21, 8:15 AM Alef Frontend F = kx F = x k F = −k x k x F = − Question 8 As force on a spring increases, what other dependent variables also increase? work elastic limit time i t t https://moe.alefed.com/teacher/?1633234182121#/lessons/lesson/a382333d-fc41-4d5f-9e8d-000000030156/content/147b414e-8884-4ffa-916e-c869… 5/11 10/3/21, 8:15 AM Alef Frontend spring constant equilibrium position displacement Question 9 A 40 N force on a spring expands it by 70 cm. What is the work done on the spring? 28 J 14 J 1.8 J 1.4 J Question 10 An external force is used to pull down a spring. The spring’s internal force acts to restore the spring to its equilibrium position. How are the external force and internal force related, at https://moe.alefed.com/teacher/?1633234182121#/lessons/lesson/a382333d-fc41-4d5f-9e8d-000000030156/content/147b414e-8884-4ffa-916e-c869… 6/11 10/3/21, 8:15 AM Alef Frontend equilibrium? The external force is larger than the internal force and they have the same direction. The external force is smaller than the internal force and they have opposite directions. The external and internal forces have the same magnitude and direction. The external and internal forces have the same magnitude and opposite directions. Question 11 Different weights attached to a spring expand the spring as shown in the graph. How would you find the work done on the spring at any point on the line? twice force multiplied by the displacement https://moe.alefed.com/teacher/?1633234182121#/lessons/lesson/a382333d-fc41-4d5f-9e8d-000000030156/content/147b414e-8884-4ffa-916e-c869… 7/11 10/3/21, 8:15 AM Alef Frontend the force multiplied by the displacement half the force multiplied by the displacement a quarter of the force multiplied by the displacement Question 12 Which of the following is an example of a person in periodic motion? a person on a roller coaster a person on a slide a person on a swing a person climbing a mountain Question 13 https://moe.alefed.com/teacher/?1633234182121#/lessons/lesson/a382333d-fc41-4d5f-9e8d-000000030156/content/147b414e-8884-4ffa-916e-c869… 8/11 10/3/21, 8:15 AM Alef Frontend How can you create periodic motion in a vertical spring with a weight attached? Spin the weight in a circle and release. Pull the weight down and release it. Hang a larger weight on the spring. Hang a smaller weight on the spring. Question 14 Select the correct phrase from the drop-down menu. A weight attached to a spring is pulled down. This force expands the spring and as a result, the spring develops an internal force in the opposite direction, which when released causes the spring to move with periodic motion called simple harmonic motion. Question 15 Select the correct phrase from the drop-down menu. https://moe.alefed.com/teacher/?1633234182121#/lessons/lesson/a382333d-fc41-4d5f-9e8d-000000030156/content/147b414e-8884-4ffa-916e-c869… 9/11 10/3/21, 8:15 AM Alef Frontend A moving spring is in simple harmonic motion. The internal force of the spring acts to restore it to its equilibrium position . Question 16 When different weights are attached to a spring, the spring’s displacement changes. Which graph shows force vs. displacement for a spring? https://moe.alefed.com/teacher/?1633234182121#/lessons/lesson/a382333d-fc41-4d5f-9e8d-000000030156/content/147b414e-8884-4ffa-916e-c86… 10/11 10/3/21, 8:15 AM Alef Frontend https://moe.alefed.com/teacher/?1633234182121#/lessons/lesson/a382333d-fc41-4d5f-9e8d-000000030156/content/147b414e-8884-4ffa-916e-c86… 11/11
