Two Force Balance Practice questions, conditions for two force balance

The balancing force is acting on the same object.

Pressure is acting on the grass.

The frictional force is in the opposite direction to the applied force.

And here there is no friction and there is no friction.

a, Interaction forces;

b, no frame at all;

c, the direction is the same, no;

d, acting on the same object, the magnitude of the force is equal, the direction is opposite, choose d

Option d The equilibrium force acts on the same object, A is the interaction force, and B is not in the same direction, of course it is impossible to equilibrium.

d: The gravitational force on the ball and the support force of the grass on the ball.

The equilibrium force is two forces on an object, the object of study is one, the action force and the reaction force are acting on the two objects, and the object of study is two interacting objects.

Of course, first of all, we need to understand what equipoise is.

Equilibrium is two forces acting on the same object of the same magnitude and opposite directions. The nature of the force is the same.

In the above topic, only d fits the concept of equilibrium force acting on an object, and the magnitude of the force is equal in direction and the nature of the force is the same.

A balanced force is a force acting on the same object, in opposite directions, and of equal magnitude.

aThe two forces are not on the same object, so they are not correct.

b Two forces act on the same object, but they are not in opposite directions and therefore are not correct.

C, like A, is also not right.

D is right and eligible.

Select D, the balance of the two forces requires to be on the same object, so it is excluded that a, c, and b are not on the same straight line, so D is selected

The conditions for the equilibrium of the two forces are: equal in size, opposite in direction, acting on a straight line, acting on an object.

Size: Equal.

Direction: The opposite two forces act on the same object and in the same straight line.

Effect: The object remains at rest or moves in either direction in a uniform linear motion.

That is, two forces acting on the same object, if they are equal in magnitude, opposite in direction, and in the same straight line, the two forces balance each other.

Equilibrium state. When an object in equilibrium deviates from the equilibrium state due to a slight effect of the outside world, the equilibrium state of the object can be divided into four situations due to the difference in stability: stable equilibrium; unstable equilibrium; metastable equilibrium; Balance as you go.

The distinction of these equilibrium states should depend on the equilibrium position in which we place the object.

The conditions for the balance of the two forces are:

1. Two forces act on the same object.

2. The magnitude of the two forces acting on the object is equal.

3. The two forces acting on the object are in opposite directions and in the same straight line.

If an object is at rest or moving in a straight line at a uniform speed under the action of several forces, then the object is in equilibrium. If the object is in equilibrium under the action of two forces, then the two forces are in balance with each other, which is referred to as two-force equilibrium.

Here's something I've learned:

If an object can remain at rest or move in a straight line at a uniform speed when it is subjected to two forces, we say that the object is in equilibrium. The two forces that keep an object in equilibrium are called equilibrium forces.

Two forces acting on an object, if the object is at rest or in a state of uniform linear motion, then the effect of these two forces cancels each other out (the net force is 0), we say that the two forces are balanced.

Conditions for the balance of forces.

Size: Equal.

Direction: Opposite.

Other conditions: on the same line, on the same object.

Effect: The object is stationary or moves in a straight line at a uniform speed.

Two forces acting on the same object, if they are equal in magnitude, opposite in direction, and on the same straight line, the two forces balance each other.

An object can be subjected to multiple forces, such as vertical upward support and vertical downward gravity. At this point, the object is stationary or moving in a straight line at a uniform speed.

The following ** intuitively reflects the balance of two forces (also a classic exam question).

Note: The conditions for the equilibrium of two forces are simply homogeneous, colinear, reversed, and equal. In particular, the condition of "homogeneity" is often missed by beginners, resulting in an incorrect judgment of the balance of the two forces.

In the movie "Captain America 2", the director of S.H.I.E.L.D. is hunted and killed by the Hydra organization. Nick drives a car that resembles a tank and goes all the way. Bucky dropped a bomb under the chassis of the car, and the bomb**, the car's uniform speed and straight driving state were instantly subverted.

So how can you keep an object moving in a straight line at a uniform speed?

The general definition of two-force equilibrium is: if two forces acting on the same object (i.e., at the same point of action), equal in magnitude and opposite directions, then the resultant force of these two forces is 0, and we say that the two forces are balanced. (The stressed object is also in equilibrium).

For the landlord "understand the definition, the practical application is not good", the key is to grasp the point that "two forces acting on the same object (i.e., the same point of action)".

Many mistakes in judging the balance of two forces are due to not figuring out where the two forces are working. For example, here's a common example:

Determine whether the gravity of the chandelier and the pull of the ceiling on the rope are balanced.

At first glance, the answer to this question seems to be yes, the rope pulls the chandelier, the ceiling pulls the rope, without the tension of the ceiling and the gravity balance of the chandelier, wouldn't the chandelier fall down? This statement is naturally wrong.

After careful force analysis, it will be found that the pull of the ceiling on the rope acts on the rope, while the gravity of the chandelier acts on the chandelier, so the two forces are not a balanced force.

The problem of power.

Power refers to the speed at which the car does work, power p=fv, f is the power provided by the car, and v is the speed of the car.

For cars, there is a maximum power p.

It can be seen from this formula that when p is fixed for the maximum power, the force is large, the speed is laughing, and the speed is large, the force is small. That is, it is impossible for a car engine to provide a large speed and a large force at the same time. In the process of speeding up, the power that the car can provide will decrease, and when the speed reaches a certain value, the force will decrease to the same as the amount of resistance, and the car will not accelerate.

In fact, power determines that many devices in reality cannot accelerate infinitely, because they do not work as fast as they can.

When you add to 200N and it is constant, the acceleration is constant, but the power of the car will continue to increase, and when it reaches the rated power, the speed will not change. p=fv

If it had been 200n, he would have been accelerating a=f m

f=200-100=100

So it's been accelerating.

1. Two-force balance and equilibrium force From the definition, two-force balance only refers to the balance of two forces, while balance force refers to more than one pair of balanced forces, and the number is different;

2. The two forces are balanced, and the body of the shirt remains in the original state of the shirt;

3. The balance of the two forces is: the two forces are equal in magnitude, opposite in direction, acting on a straight line, acting on the same object, and the equilibrium force is: the force acting on the object is zero or rising.

4. Equilibrium can act on a line.

1.The balance of two forces belongs to the balance force and is not exactly the same.

2.According to Newton's laws, it could also be a stationary group.

3.Equipoise:

Several forces acting on the same object, if the object is still or becomes in a state of stationary or uniform linear motion, then the net force of these forces is zero, and we say that these forces are balanced.

Two forces are balanced. If the object remains at rest or in a straight line at a constant speed, the effects of these two forces on the object's motion cancel each other out (the resultant force is 0), and we say that the two forces are balanced.

4.Not necessarily.

Two-force equilibrium refers to the equilibrium of two forces of equal magnitude and opposite directions acting at the same point to be the balance of forces on the object, and for one of the forces, the other force is its equilibrium force. The force balance of the object does not mean that the trapped object is stationary, the force balance is only buried in the nucleus and does not change the motion state of the object, if the original object is in a uniform motion, then it is still in uniform motion after the action of the equilibrium force.