Why is the thrust not drawn, why is he not the thrust

It says that there is no thrust to go up at a certain speed.

It's all the same, force is a vector, it can be translated, how to draw an image, how to draw it.

Test question analysis: (1) When the air resistance is not considered, the bullet is only affected by the earth's gravity on it, and the point of action is at the center of gravity, and the gravity can be calculated according to g=mg (2) The drawing method of the diagram of the force: first draw the scale, and then find the point of action of the force, from the point of action of the force, draw a line segment along the direction of the force, draw an arrow at the end of the line segment to indicate the direction of the force, and mark the magnitude of the force at the end of the segment (3) The object resting on the inclined plane is subjected to gravity, friction and support, Then the center of gravity represents the direction of the three forces respectively

1) Gravity of the center of gravity of the bullet is made vertically downward, and the gravity is g=mg=, as shown in the figure: (2) Draw a scale of 125N, from the point of action of the force, according to the scale, draw a line segment with an arrow along the vertical upward, the line segment with a size of 250N, and mark the symbol F, as shown in the following figure: (3) Gravity over the center of gravity for vertical downward gravity, over the center of gravity for friction along the inclined plane, and through the fulcrum for the support force perpendicular to the inclined plane As shown in the figure:

Comments: This question tests students' ability to analyze the force on the object, and will use the schematic diagram of the force to show the action point and direction of the force Clarify the magnitude, direction, and action point of the force, and make the drawing according to the drawing requirements, and generally divide the line segment into 2 (or 3) segments to determine the scale.

It says that there is no thrust to go up at a certain speed.

Rushing up yes means it's moving upwards because of inertia.

Figure 1: The arrow refers to the direction of motion, and the title says that the force analysis diagram is drawn, and the thrust is not emphasized, which is a constant acceleration and uniform deceleration, and the high one is very common, and there is no thrust.

It says that there is no thrust to go up at a certain speed.

Both draws are wrong. You should start from the geometric center of the object, make a line segment according to the direction of the force, and determine the length of the line segment according to the magnitude of the force.

It's all the same, force is a vector, it can be translated, how to draw an image, how to draw it.

Wen Hao (Hao's word means: vast and boundless) Xiujie (Xiu: to describe the slender and tall figure, Jie: neat).

Because the pressure acts on the contact surface, it is more appropriate to draw the zhi on the contact surface

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If you study the pressure caused by the object on the ground, you should draw it on the contact surface of the object's ground, because the ground is studied, and the ground wood has a center; If the study of a certain object A exerts pressure on the object B, the force diagram of B can be drawn on the center of gravity (if the pressure is not studied).

Pressure is the force exerted by an object on the "contact surface", and its point of action is on the contact surface. Of course, it cannot be drawn on the center of gravity of the object, because it is not the force on the object.

In physics, pressure refers to the force that occurs on the contact surface of two objects, or the perpendicular force of a gas on the surface of a solid and a liquid, or the perpendicular force of a liquid on a solid surface. Traditionally, in mechanics and most engineering disciplines, the word "pressure" is synonymous with pressure in physics.

The center of gravity is the point at which the resultant force of all the constituent fulcrums of the gravity force passes through the object in any direction in the gravitational field. The center of gravity of a regular and uniform object is its geometric center. The center of gravity of an irregular object can be determined by the suspension method.

The center of gravity of an object, not necessarily on the object. Also, the center of gravity can refer to the center or main part of the matter.

The position of contact between the object and the tabletop, the push and pull force are also at the contact site.

The thrust and friction must be in the same straight line.

Generally, friction and thrust are drawn on the center of gravity of the object, and they are located in the same straight line.

Decomposition of force: at the center point of the square object, it is decomposed into a force fy that is vertically downward and a force fx that is horizontal and forward; fx=fy=f*sin45°。