What is the physical quantity of an object that is moving in a uniform circular motion and remains u

Choose A. In the process of motion, the direction of the centripetal force must be perpendicular to the direction of linear velocity, and the centripetal force does not do work on the object; The centripetal force is not a new force of nature experienced by an object, but the resultant force of an external force experienced by an object; The direction of the centripetal force is always directed towards the center of the circle, and its direction changes all the time, so it is not a constant force.

Checked, the centripetal force is perpendicular to the direction of velocity, so the centripetal force does not do work.

In c, the centripetal force may be gravity, tension, etc., and in d, the magnitude of the centripetal force remains the same, but the direction is changing, pointing to the center of the circle.

a Uniform circular motion is actually a variable acceleration curve motion, but the linear velocity, angular velocity, centripetal acceleration, period, frequency and other quantities remain unchanged in the process of motion.

A pair Because it is a uniform circumference, if it is not perpendicular, there is a component force in the tangent line that will change the velocity magnitude.

Since the force and displacement are always perpendicular, then there is no component in the direction of displacement, so no work can be done.

c False The centripetal force is an effectual force, not a qualitative force, that is to say, there is no real centripetal force, it is a synthetic force.

D false The centripetal force always points to the center of the circle, so its direction has been changing, and it will not be a constant force, and the constant force requires that the magnitude and direction are unchanged (vector).

The centripetal force of a is chosen because it is perpendicular to the direction of velocity and has no component along the direction of velocity, so no work is done.

The centripetal force is an inertial force, not a new force.

The direction of the centripetal force changes all the time, so it is not a constant force.

Select ab: The centripetal force of an object moving in a uniform circular motion is perpendicular to the direction of velocity and does not work.

C: The centripetal force is the component of the original force, or the resultant force. Not a new force of nature.

D: The direction changes at any time, how can it be constant force.

a.Right. b do not do work, wrong.

c The centripetal force is the effect force.

d is not a constant force, a change in direction, wrong.

a Centripetal force does not do work on an object Centripetal force is a force named after the effect of action The direction of the centripetal force changes all the time.

When doing uniform circular motion, the physical quantities that remain unchanged are: linear velocity, angular velocity, period, frequency, kinetic energy, centripetal acceleration, and centripetal force (given object).

What is uniform circular motion.

The motion of a particle in a circular motion is called "uniform circular motion" if the length of the arc passing through it is equal in any equal amount of time, and the linear velocity of the uniform circular motion changes from moment to moment.

Sufficient and necessary conditions for uniform circular motion.

1. It has an initial velocity (the initial velocity is not zero).

2. It is always subjected to the resultant external force of the same magnitude, the direction is perpendicular to the direction of velocity, and the direction of velocity is on the same side.

Properties of uniform circular motion.

1. Movement characteristics: the size of the linear velocity remains unchanged, and the direction changes at all times.

2. Stress characteristics: all external forces provide centripetal force.

3. Nature of motion: the direction of rain acceleration changes all the time, so the uniform circular motion is a non-uniform variable speed motion.

In a uniform circular motion, what remains constant means that it is not the same in size and direction (in the case of a vector).

Therefore, the physical quantities of the unchanging stool are:

The magnitude of linear velocity (you can't say "linear velocity"), angular jujube attack velocity, period, frequency, kinetic energy, magnitude of centripetal acceleration, magnitude of centripetal force (given object).

The physical quantities in which an object moves in a uniform circular motion are as follows:

1.Angular velocity.

2.Linear velocity.

3.Centripetal acceleration.

4.Centripetal force.

In the uniform circular motion of the family, which of the following physical quantities does not change?

1.Angular velocity.

2.The magnitude of the resultant external force.

Correct Answer: Angular velocity.

If the length of the arc passing through the arc is equal in any equal time, this kind of slippery motion is called "uniform circular motion". By definition, we can see that (angular velocity) = δt = 2 t = 2 n (representing angle or radian) is a constant, so the angular velocity does not change.

Linear velocity (linear velocity is the magnitude of velocity), angular velocity, magnitude of acceleration, angular acceleration, magnitude of momentum, angular momentum, period, frequency, kinetic energy.

The conclusion is: the size of almost all threads.

Almost all angular quantities, including magnitude and orientation, except for angular positions, are constant.

The linear velocity magnitude is unchanged (so upstairs is wrong), period, frequency, angular velocity, kinetic energy.

angular velocity, period, length of trajectory, linear velocity, centripetal acceleration, impulse, kinetic energy, mechanical energy, internal energy.

The magnitude of the velocity angular velocity of the magnitude of the centripetal acceleration of the rotational speed period.

The angular velocity is actually constant, and the magnitude and direction of the angular velocity are constant. The direction of angular velocity is determined by the right-hand spiral determination, and if it is a counterclockwise circular motion when viewed from top to bottom, then the direction of angular velocity is always upward. So there is also a b in the answer

If you follow the general definition in the book, it will not change. Because, speed refers to speed in junior high school and high school textbooks. Because uniform circular motion is a stable state of motion, nothing changes.

Angular velocity is a vector quantity and the direction is perpendicular to the circumferential plane.

None of the same is upstairs corrected, the angular velocity is a vector, but the direction is the same.

In a uniform circular motion, v does not change, =v r, t=2 r v, f=1 t, these physical quantities do not change.

Hello! The velocity is a vector, there is a magnitude and a direction, the magnitude of the velocity does not change, but the direction keeps changing, a is wrong.

v = wr, w angular velocity is also a vector, the direction is constantly changing, b error c is correct, according to the periodic formula t=2 w (where w only indicates the angular velocity magnitude) rotational speed refers to the number of times an object does circular motion per unit time. is a scalar quantity, and like the period, it does not change.

So choose CD

Hope it helps!

The following phenomena do not change the state of motion of the object.

First of all, you have to distinguish what is a vector and what is a scalar, vector is a physical quantity with a size and a direction, and a scalar is a physical quantity with a magnitude and no direction.

Kinetic energy is a scalar quantity, so it does not change;

The velocity is a vector, although the magnitude does not change, but the direction changes from moment to moment, it is the tangent direction;

Acceleration is also a vector quantity, and the direction is directed by the object to the center of the circle, so it is changing;

The direction of the resultant force is the direction of acceleration, and Newton's second law tells us that the resultant force is the cause of the acceleration, and it is also changing at this time.

The velocity does not change, so the kinetic energy does not change

The direction of velocity, acceleration and external force changes.

So you can only choose A

a, the direction of other physical quantities is changing.

a, because the direction changes all the time, the vector is changing, and the scalar is constant.

Choose A. In the process of motion, the direction of the centripetal force must be perpendicular to the direction of linear velocity, and the centripetal force does not do work on the object; The centripetal force is not a new force of nature experienced by an object, but the resultant force of an external force experienced by an object; The direction of the centripetal force is always directed towards the center of the circle, and its direction changes all the time, so it is not a constant force.