解答上述试题---**Extracted Content:** **Title:** 三、作图题 **Question 1:** 1. 如图1.3-15所示，有一个物体放在水平地面上。以 A 为作用点，画出物体对水平地面压力的示意图。 **Chart/Diagram Description:** * **Type:** A simple physics diagram showing an object resting on a horizontal surface. * **Main Elements:** * **Object:** A rectangular block is shown, standing upright on its base. Inside the block, the letter "A" is visible. * **Surface:** Below the block, a horizontal line with short diagonal lines (hatching) underneath represents a horizontal ground or surface. * **Point of Application:** A small black dot is marked on the bottom surface of the rectangular block, precisely at the center of the contact area between the block and the horizontal surface. This point is referred to as 'A' in the question stem, serving as the point of application for the pressure. * **Relative Position:** The rectangular block is positioned centrally and directly on top of the horizontal hatched surface. * **Figure Caption:** 图 1.3 - 15