What is the relationship between the center of gravity and the balance of movement

All parts of an object are subject to gravity, and from the effect point of view, we can think that the gravitational force of each part is concentrated at one point (the point at which gravity acts on the object), which is called the center of gravity of the object.

The center of gravity of an object with uniform mass distribution and regular shape is located at the geometric center of the object, such as the center of gravity of a uniform sphere at its center of gravity. The position of the center of gravity of an object with uneven mass distribution is not only related to its shape, but also related to its mass distribution, for example, the center of gravity of a crane changes with the weight and height of the lifting weight.

The center of gravity of an object is a fixed point, independent of the position and state of motion of the object; The position of the center of gravity is also not necessarily on the object, for example, the center of gravity of a uniform mass distribution ring is located at the center of the circle.

The center of gravity of an object with uneven mass or irregular shape can be found by using the experiment-suspension method: the object is suspended and balanced, and the point of gravity must be in the direction of the suspension line, and then a new suspension point must also pass through the center of gravity, and the intersection point of the front and rear lines is the position of the center of gravity.

The position of the center of gravity can also be calculated using the rotational equilibrium condition.

Oh, that's right.

Solution: Possibly. Because if this object is a sphere with uneven mass distribution.

Roll in a certain direction.

Then it is impossible to roll in a straight line at a uniform speed.

The center of gravity remains the same, and the determination of the center of gravity is in the book, which is not much to say here.

Principle:If each element of a structure is considered as an object, then there must be a point of equilibrium (i.e., the center of gravity) under the action of these objects, and the position of this point of equilibrium determines the physical balance of the structure.

Every tiny part of an object is subject to gravity.

(see gravitational forces, which can be approximated as converging systems of forces intersecting at the center of the earth.) As the size of the object is much smaller than the radius of the earth.

Therefore, the gravitational force acting on an ordinary object can be approximately regarded as a parallel force system, and the total weight of the object is the resultant force of these gravitational forces.

If the volume and shape of an object are not the same, the gravitational force on the object will always pass through the coordinate system fixed to the object, regardless of the direction it is in towards the ground.

A certain point, the center of gravity. The center of gravity is not necessarily on the object, for example the center of gravity of a ring is not on the ring, but on its center of symmetry. Collapse.

The position of the center of gravity is of great significance in engineering. For example, in order for the crane to work normally, the position of its center of gravity should meet the conditions of a single annihilation, and the floating stability of the ship is also related to the position of the center of gravity; If the center of gravity of a high-speed rotating machine is not on the axis, it will cause violent vibrations, etc.

From a physical point of view, the line perpendicular to the center of gravity and the table top through the object is maintained in the support surface of the object. Otherwise, the object can easily fall over. To keep an object stable, it is necessary to consider the question of its center of gravity and balance.

In ancient China, the study of gravity and balance has achieved fruitful results, and many artistic masterpieces have been created, which occupy an important position in history and have far-reaching influence.

Flat bricks are very stable, and bricks are easy to tip over when they are erected; The water in the bottle is very stable, and the empty bottle or the bottle full of water is more likely to tip over. From the above two examples, in order for an object to be stable and not easy to tip over, two conditions need to be met: first, its base area should be large; Second, its importance is concentrated at the bottom as much as possible, that is, its center of gravity should be low.

The center of gravity of an object can be thought of as the point of application of the resultant force of gravity.

For any object, if its base area is larger and the center of gravity is lower, it will be more stable and less likely to tip over. For example, a tower-shaped building is always large at the bottom and pointed at the top; When shipping goods, always put the heavy things underneath and the light ones on top.

With this knowledge in mind, let's take a look at the tumbler. The tumbler's entire body is light, except for a heavier piece of lead or iron at its base, so its center of gravity is very low; On the other hand, the base area of the tumbler is large and sleek, making it easy to swing. When the tumbler is tilted to one side, due to the change of the fulcrum (the contact point between the tumbler and the desktop), the center of gravity and the fulcrum are not on the same plumb line, at this time, the greater the degree of tilt of the tumbler, the greater the horizontal distance of the center of gravity from the fulcrum, the greater the swing effect produced by gravity, and the more significant the tendency to return it to its original position, so the tumbler can never be pushed down.

Like tumblers, the equilibrium state in which a stationary object can automatically return to its original position after a slight disturbance is called steady and burning equilibrium in physics. Ball-like objects such as table tennis balls, footballs, and basketballs can continue to maintain balance in any position after being subjected to external forces, and this state is called casual balance. For an object in casual equilibrium, the center of gravity and fulcrum are always on the same plumb line, and the height of the center of gravity remains the same.

The pencil placed horizontally on the table is a kind of casual balance, no matter where it rolls, the height of the center of gravity is constant.

Factors that affect the balance and stability of the human body include weight, support surface, and center of gravity. Weight: It is the degree of gravity of the object and the weight of the pants, the weight and mass are different, and the unit is Newton.

Support surface: It is a plane composed of support points, which is a plane enclosed by the outermost support point line, because the support point on the support surface can only provide support force, but not tensile force, so the lower the center of gravity of the object, the more stable the object. Center of gravity:

Refers to the point of the resultant force of the Earth on every tiny part of the gravitational pull of an object.

Factors that affect the balance and stability of the human body include weight, support surface, and center of gravity.

1. Weight: It is a measure of the size of the object subjected to gravity, the weight and mass are different, and the unit is Newton. It is an essential property of an object. Under the gravitational pull of the Earth, the weight of a substance with a mass of 1 kg is Newton.

2. Support surface: It is a plane composed of support points, which is the plane enclosed by the outermost support point line, because the support point on the support surface can only provide support force, but cannot provide tensile force, so the lower the center of gravity of the object, the more stable the object.

3. Center of gravity: refers to the point of the resultant force of the earth on each tiny part of the gravitational force of the object.

The center of gravity is the point of action of gravity, and every object has a center of gravity and only one center of gravity. The center of gravity changes with the shape of the object as well as the distribution of mass. The shape is regular, the mass distribution is uniform, and the center of gravity of the object is generally at the geometric center of the object.

The relationship of gravitational equilibrium can only be said when the object is in equilibrium, or when the gravitational force cancels each other out with other forces, and the object is in equilibrium.

Equilibrium is a matter of state, that is, when an object is in mechanical motion, if the object is in equilibrium, then the net force to which it is subjected is zero. In junior high school physics, the equilibrium state is that the object is at rest or in a uniform linear motion, and in high school physics, it is said that when the velocity state of the object is unchanged, it is the equilibrium state of the object.

When an object is subjected to gravity, and the object wants to be in equilibrium, then it must have another force that counteracts with gravity, and this force is the equilibrium force of gravity.

When it comes to the relationship between gravity and stability, there is also a saying in this direction, and it can be said that the lower the center of gravity, the better the stability of the object.

A pair of equilibrium forces, equal in magnitude and in opposite directions, act on the same object.