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## work and energy questions and answers

d. TRUE - The equation states that PEgrav = m•g•h; PE is dependent upon mass. 5. The power delivered by the toe rope is 450 Watts. Motion | Lesson Exercises, CBSE Class 7th (VII) English Chapter 2. Mensuration CBSE Class VI (6th) Mathem... Chapter 10. Question 1. What is the ratio of velocities of a nucleus that splits into two parts with radii 1:2 4. Then the displaceme... Part (1)               Question 1. Asked by Mail.nehasharmaa 19th February 2019 10:13 AM Consider a particle of mass m which is driven by a machine that has a constant power k Watts. (D) 48J, 3. f. TRUE - Friction is a non-conservative force and thus alters the total mechanical energy of an object. Calculate the final kinetic energy of a block of mass if the mass of the block is 10kg and has a constant velocity of 10m/s. i. c. FALSE - This is not always the case. A 1-kg object is accelerated from rest to a speed of 2.0 m/s. a. j. So these NEET Physics MCQs with Answers for all Concepts as per the latest syllabus. The force of the road on the tires does positive work while air resistance does and equal amount of negative work. Heat Chapter 5. (B) (R+ma)v This object gains 4.0 Joules of kinetic energy. g. TRUE - Kinetic energy does not have a direction associated with it; it is a scalar quantity. n. TRUE - A force which acts in a direction opposite the motion of an object will do negative work. Copyright 2020 , Engineering Interview Questions.com. FALSE - If a force does not add mechanical energy to a system of objects, then it is likely a conservative force (provided it doesn't remove mechanical energy either). Answer: See table above; explanations provided below. m. FALSE - The kinetic energy increases from 0 J to 2 J (0.5•1•22); that's an increase by 2 J. n. FALSE - Such an object will definitely gain or lose mechanical energy but not necessarily kinetic energy. What is the secret that Meena shares with Mridu in the backyard? g. TRUE - This is the conservation of energy principle and one that you need to firmly understand. e. FALSE - Whether there is envy in a physicist's heart is not for us to tell; the evil found within one's heart is often vast and mysterious ... . c. The force is vertical and the displacement if horizontal; they make a 90 degree angle. We can however definitively say that a physicist classifies forces in order to analyze physical situations in accord with the classification. (C) 392J 10. C. Units of work would be equivalent to a Newton times a meter. What is the force on the particle at time t if the particle starts from the rest? On the other hand if one or more non-conservative-classified forces are doing work, then KEi + PEi + Wnc = KEf + PEf. e. TRUE - Tension does not do work upon the object and so the total mechanical energy is conserved. a. The presence of air resistance (a non-conservative force) does a little work and so one might notice a very slight change in mechanical energy. h. TRUE - The Joule (abbrev. e. FALSE - Work is not dependent on how rapidly the force displaces an object; power is time-based and calculated by force multiplied by speed. c. The force is backwards and the displacement is forwards. (A) When the body experiences force 1. TRUE - Power is a rate quantity and thus time-based. i. Knowing our Numbers:Page 2 Q. Which of the following statements are true about mechanical energy? When the force and the displacement act in the same direction, positive work is done. It would however be possible that work is not done by a non-conservative force and there be no transformation of energy at all; i.e., the object remains at rest. External (i.e., Non-conservative) Forces. A worker covers a distance of 40 km from his house to his place of work, and 10 km towards his house back. (D) 4:1, 12. If a non-conservative force acts upon an object, then the object will either gain or lose mechanical energy. 8. c. FALSE - The mechanical energy of an object is only conserved if non-conservative forces do not do work upon the object. Questions with in the  Chapter  Page 100 ( CBSE Class IX ( 9th) Science Textbook - Chapter 8. Include all that apply. J. Meena ... Chapter 1. (D) None of the above, Answer: (B) When there is an increase in energy because of mechanical influence, 10. (C) mav c. FALSE - Gravitational potential energy is dependent upon the mass of the object (PEgrav = m•g•h) but elastic potential energy is dependent upon the spring constant and the compression or stretch length of the spring (PEelastic = 0.5•k•x2). Try these : (Class VI ( 6th) Mathematics Chapter 1. Rank these four objects in increasing order of kinetic energy, beginning with the smallest. c. FALSE - If an object is on the ground, then it does not have potential energy (relative to the ground). CBSE Class 9 Science Chapter 11 Work and Energy, Explanation, Examples, Question Answers. Answer. Answer. f. In baseball, the catcher exerts an abrupt applied force upon the ball to stop it in the catcher's mitt. TRUE - Work is a form of energy, and in fact it has units of energy.. b. A falling object always gains kinetic energy as it falls. g. In a physics lab, an applied force is exerted parallel to a plane inclined at 30-degrees in order to displace a cart up the incline. Which of the following statements are true about conservative and non-conservative forces? If two people do the same job, then they're doing the same amount of work. What is the average power required to lift a mass of 100kg to a height of 50m in 50 seconds? Include all that apply. J, Object C: KE = 0.5•(1.0 kg)•(5.0 m/s)2 = ~13 J (12.5 J), Object D: KE = 0.5•(5.0 kg)•(2.0 m/s)2 = 10. FALSE - Watt is the standard metric unit of power; Joule is the standard metric unit of energy.. c. TRUE - A N•m is equal to a Joule. (C) When m1 > m2, m2 will move with four times increase in its velocity than m1 / Exam Questions - Work, energy and power. (A) 6:1 Two objects of the same mass could have different weights if in a different gravitational field; so it is not appropriate to say that kinetic energy depends upon weight. m. FALSE - There are many instances in which an individual force does positive work and yet the object maintains a constant speed. The person who does it fastest generates more power. (A) When m1 and m2 is at rest, the kinetic energy transferred will be maximum Consider a force applied to lift an object at constant speed. However, another object could have less speed and make up for this lack of speed in terms of a greater mass.

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