PHY165 Physics Modules 3 Actual Exam Study Questions with Verified Answers | Brand New Version

PHY165 Physics Modules 3 Actual Exam Study Questions with Verified Answers | Brand New Version 1. Dynamics - ANSWER Branch of classical mechanics concerned with the study of forces and their effects on motion 2. Force - ANSWER Push or a pull 3. What is the other name of Newton's Third Law of Motion? - ANSWER Law of Interaction 4. Which one of the following statements is NOT part of the Law of Inertia? - ANSWER For every action, there is an equal but opposite reaction 5. Which of the following is NOT true about actions and reactions according to the Law of Interaction? - ANSWER Actions and reactions act on the same system 6. What is the equation associated with the Law of Acceleration? - ANSWER Fnet = ma 7. Which of the following is the BEST description of a force? a) simply a push or a pull b) an action exerted on an object which may change the object's state of rest or motion c) something only found in sci-fi movies d) A and B - ANSWER a) simply a push or a pull b) an action exerted on an object which may change the object's state of rest or motion c) something only found in sci-fi movies *d) A and B* 8. What is the unit for force? - ANSWER Newtons 9. In a free body diagram of a box resting on the floor, how many forces would you draw? A) 1 B) 2 C) 3 D) 4 - ANSWER B) 2 10.True or False: When an object is in uniform circular motion its velocity is constant. - ANSWER False 11.Law of Interaction? - ANSWER For every action, there is an equal but opposite reaction 12.According to Newton's Third Law of Motion, what is the reaction to a ball being kicked by a teenager? - ANSWER The ball applies a force to the teenager's foot 13.True or False: In physics. The Weight and Mass of an object have the same value. - ANSWER False 14.What is the weight of a 1560 kg car? - ANSWER W=mg 1560 x 9.80= 15,288 *15,290 N* 15.When a tugboat pulls a barge with a net force of 842,000 N, what acceleration will the barge experience if it has a mass of 1,625,000 kg? - ANSWER Use f=ma revise a=Fnet/m 842,000/ 1,625,000 = 0. *0.518 m/s^2* 16.When a 2270 kg car accelerates from rest to 12.0 ms in 2.50 s, what net force acts on the car during this time? - ANSWER Use a=vf-vi/t answer in m/s^2 Use f=ma answer in N (12.0 - 0 ) / 2.50 = 4.80 2270 * 4.80 = 10,896 *10,900 N* 17.Calculate the spring constant of a spring if it stretches 17.5 cm when a force of 102 N acts on it. - ANSWER use k=f/x 102/ 17.5= *5.82 N/m* 18.A 38.4-kg child is playing on a Merry-Go-Round that has a diameter of 3.42 m. She is moving at a uniform tangential speed of 3.32 . Answer the following questions about the child's motion. 19.What is the more complex definition of a force? - ANSWER A action exerted on an object that can change the object's state of rest or motion. 20.The unit for force, and what is its relationship to the fundamental units? - ANSWER 1N = 1kgms2 21.What is an agent of a force? - ANSWER The specific, immediate, and identifiable cause of a force. 22.What is the reaction to a person punching a desk? - ANSWER The desk applies a force to the person's hand. 23.What is the reaction to the gravity pulling down on a falling leaf? - ANSWER The leaf pulls up on the Earth. 24.Differentiate between weight and mass. - ANSWER The weight of an object is a measure of the pull of gravity on that object, while the mass of an object is the measure of the amount of material in an object. 25.What is the mathematical relationship between weight and mass? - ANSWER W = mg 26.What is the weight of a 91.3-g ball? - ANSWER W = mg = (0.0913 kg) (9.80 ms2ms2) = 0.895 N 27.What is the mass of a 954.6-kg elephant? - ANSWER 954.6 kg 28.What is the mass of a 282,000-N rocket? - ANSWER m = wgwg= (282,000N)/ 9.80ms2= 28,800 kg