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June 18, 2010 at 3:23 PM Worksheet on Weight (includes gravitational field and field strength) Section A 1. The gravitational field strength is the ratio A. Mass/Volume B. Gravitational force/weight C. Gravitational force/mass D. Mass/volume 2. On a planet, the gravitational force on a mass of 5kg is 20N. The gravitational field strength on the planet is A. 4 N kg^-1 B. 10 N kg^-1 C. 20 N kg^-1 ^-1 D. 100 N kg 3. The gravitational field strength on the Moon is 1.6ms^-2. What are the acceleration of free fall for a body of mass of 2kg and a body of mass 5kg respectively on the Moon? A. 0.8ms^-2; 0.32ms^-2 B. 1.6ms^-2; 1.6ms^-2 C. 3.2ms^-2; 8.0ms^-2 D. 2.0ms^-2; 5.0ms^-2 4. The weight of a body is given by A. weight=density x volume B. weight=mass x gravitational field strength C. weight=mass x acceleration D. weight=velocity x time 5. A steel ball bearing of radius 5mm is of weight W. What is the weight of a steel ball bearing of radius 10mm ? A. 2W B. 4W C. 8W D. 16W Section B 1. (a) Define the weight of an object and state its SI unit. _______________________________________ (b) Write down the relationship between mass, weight and gravitational acceleration. _______________________________________ (c) Evaluate the following statements. Correct any false statements. (i) Weight is considered a force. True/False _______________________________________ (ii) The greater the pull of gravity, the greater the weight of an object. True/False _______________________________________ (iii) Weight of an object anywhere in the universe is the same. True/False _______________________________________ (iv) Weight is equal to mass True/False _______________________________________ (v) A 5kg object has a weight of 100N on the surface of the Earth. True/False _______________________________________ (d) If the gravitational acceleration on the Earth ia 10m/s^2 and on the Moon it is 1.6m/s^2, calculate the weight of a 2kg computer (i) On the Earth (ii) On the Moon 2. A metal sphere weighs 30N on the Moon. The gravitational field strength on the Moon is 1/6 of that of the Earth. The sphere was released from a height of 5m above the surface of the Earth. (a) State the acceleration of the sphere ._________________________________ (b) State the acceleration of the sphere if it is released at the same height above the surface of the Moon._____________________________________________________ (c) Calculate the weight of the sphere on the Earth. (d) Would the speed of the sphere just before it touches the surface be the same on the Earth and the Moon? Explain. _______________________________________________________ |