![]() The total energy of an object falling freely towards the ground … The potential energy of your body is least when you are ….ī. Rewrite the following sentences using a proper alternative.Ī. While dragging or lifting an object, negative work is done byģ. (iii) The slowness with which work is performedĮ. (ii) amount of energy required to perform the work (iii) reaction force in vertical direction Which of the forces involved in dragging a heavy object on a smooth, horizontal surface, have the same magnitude? (iii) transformed from one type to anotherĬ. (i) transferred from one place to another For work to be performed, energy must be …. Choose one or more correct alternatives.Ī. Thus, they are perpendicular to each other.Ģ. Its displacement is along the tangent to the circle.In uniform circular motion, the force acting on an object is along the radius of the circle. ![]() Why is the work done on an object moving with uniform circular motion zero? Thus, if an object has no momentum then it cannot possess kinetic energy.į.Now K.E = ~ mv2, So if v = 0 then K.E also will be zero.If it is zero, it implies that v = 0 (since mass can never be zero). Momentum is the product of mass and velocity.No, it does not have kinetic energy if it does not have momentum.If an object has 0 momenta, does it have kinetic energy? Explain your answer. When an object is displaced by displacement ‘s’ and by applying force ‘F’ at an ’angle’ 30°. Determine the amount of work done when an object is displaced at an angle of 300 with respect to the direction of the applied force. (3) Let the velocity of the object be vc when it reaches the ground, near point C.įrom equations (i) and (iii) we see that the total potential energy of the object at its initial position is the same as the kinetic energy at the ground.ĭ. (2) When the object is stationary at A, its initial velocity is u = 0 (1) Let the velocity of the object be v B when it reaches point B, having fallen through a distance x. Let us calculate the energies of the object at A, B and C. Let the point C be on the ground directly below A and B. Let the point B be at a distance V, vertically below A. Let us look at the kinetic and potential energies of an object of mass (m), falling freely from height (h), when the object is at different heights.Īs shown in the figure, the point A is at a height (h) from the ground. Prove that the kinetic energy of a freely falling object on reaching the ground is nothing but the transformation of its initial potential energy. However, as initial velocity is zero, u = 0Ĭ. This generates an acceleration a in the object, and after time T, the velocity of the object becomes equal to ‘v’. Let ‘u’ be its initial velocity (here u = 0). Suppose a stationary object of mass ‘m’ moves because of an applied force. Derive the formula for the kinetic energy of an object of mass m, moving with velocity v. (iii) e.g., water at the top of a waterfall, before the drop.ī. ![]() (iii) e.g., flowing water, such as when falling from a waterfall. (i) Potential energy is the energy possessed by the body because of its shape or position. (i) Kinetic energy is the energy possessed by the body due to its motion. Explain the difference between potential energy and kinetic energy. Maharashtra State Board Class 9 Science Solutions Chapter 2 Work and EnergyĬlass 9 Science Chapter 2 Work and Energy Textbook Questions and AnswersĪ. Balbharti Maharashtra State Board Class 9 Science Solutions Chapter 2 Work and Energy Notes, Textbook Exercise Important Questions and Answers. ![]()
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