Questions 1-6 (2 points each.-20 minutes total) 1. Suppose that a block with wei

Question

Questions 1-6 (2 points each.-20 minutes total) 1. Suppose that a block with weight 1ON moves across a surface with constant speed under the action of a horizontal force F 3N. Which statement concerning this situation is not true: (a) The block is not accelerated. (b) The net force on the block is zero N. (c) The frictional force on the block has magnitude 3N. (d) The coefficient of kinetic friction between the block and the surface is 0.30. (e) The direction of the total force that the surface exerts on the block is vertically upward. 2. You break down an object into small sections, add the products of the individual masses and positions, and divide by the total mass when you want to determine the center of mass of: (a) Any object (b) An oddly shaped object (c) A hollow sphere (d) Any 3-dimensional body 3. A resultant force of 7N gives a certain mass an acceleration of 0.5 m/s2. How large a force is needed to give an object with twice the mass the same acceleration?

Explanation / Answer

1. There is gravitational force vertically downwards on the block. Thus option (b) is the answer

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