About Uniform Circular Motion 55, About Uniform Circular Motion

This is because the normal acceleration itself changes direction and is always perpendicular to the described velocity.

It depends on which velocity object is described in terms of acceleration. If the velocity is decomposed into x-axis and y-axis components (the direction of velocity is constant), then it is clear that the normal acceleration is changing the magnitude of the two velocities.

There's no need to take it too seriously, acceleration is just a physical quantity that people use to describe changes in velocity. The change in velocity is a change in the magnitude of the value and a change in direction. When describing the change in velocity, there is acceleration that only changes the magnitude of the velocity value, and there is acceleration that only changes the direction of velocity, the former is the same as the direction of the described velocity (negative values can also be used as a magnitude comparison of the value), and the latter is perpendicular to the direction of the described velocity.

The normal acceleration itself changes direction, and is always perpendicular to the direction of the described velocity (velocity in the tangent direction, regardless of whether the velocity is average) or not, and to describe the change in this velocity is, of course, to change the direction of this velocity. If there is an acceleration, one of its two components is always in the same direction as the velocity, and the other component is the normal acceleration, obviously it is the same component that changes the velocity value in the same direction as the velocity, and only changes the magnitude of the velocity value, but not the direction.

Acceleration is required to change the velocity, which is an external force.

The external force can be broken down perpendicular to the direction of velocity and along the direction of velocity.

The direction of the force perpendicular to the velocity changes the direction of velocity, and the force along the direction of velocity changes the magnitude of the velocity.

Normal acceleration is perpendicular to the direction of velocity, so it doesn't change the velocity.

Because this acceleration is in the direction of motion of the perpendicular object. You can draw a tangent line on the circle of motion and then draw a normal line to see, it must be vertical. What changes is the radius of the circumference of the object's motion, the linear velocity does not change, but the radius changes, so the angular velocity changes.

Because he is always perpendicular to the direction of velocity, and velocity is a vector, you say that "normal acceleration can only change direction", which is wrong, and the reason for changing direction is not normal acceleration, but centripetal force.

Of course, it doesn't change. For example, if you take a train. Jumping in place doesn't make a difference. Because people themselves have inertia when they are in constant motion.

What is uniform circular motion.

The normal direction does not do work. Tangential work.

Normal acceleration is centripetal acceleration, and the direction of the velocity of the circular motion is along the tangent direction of the circle, always perpendicular to the normal acceleration, so it cannot change the magnitude of the velocity, only the direction.

With the positive coke decomposition method. There is no force in the direction of velocity, so the magnitude of velocity does not change. Only with force can there be acceleration, and only with acceleration can there be speed!!

Relative to the uniform circular motion, the normal acceleration is the centripetal acceleration, but the normal acceleration is perpendicular to the velocity direction of the object, that is to say, the direction of the resultant external force on the object is perpendicular to the velocity direction of the object, so the resultant external force does not do work on the object, so the velocity of the object remains the same.

To change the linear velocity, there must be acceleration in the direction of velocity. The normal acceleration is always perpendicular to the direction of velocity, so the normal acceleration cannot change the magnitude of the linear velocity, but only the direction of the velocity.

Because the normal acceleration is perpendicular to the center of the circle, it is a component force, and it must only change the direction of the velocity! It's another component that changes the magnitude of the speed!

The normal acceleration is always perpendicular to the velocity, and if no work is done, the velocity cannot be changed.

Normal acceleration is perpendicular to the center of the circle and is a component perpendicular to the centripetal force.

Therefore, the direction of force in the normal direction of acceleration has nothing to do with the force experienced by the object, and the solid normal acceleration can only change the direction, but not the magnitude of the velocity.

Acceleration causes the object to gain a change in velocity, and the direction of this variable of velocity is the same as that of acceleration. Normal acceleration can only change the velocity of the object gaining the normal direction, so it cannot change the magnitude of the velocity.

1. The particle moves in a circle, and if the length of the arc is equal in any equal time, this motion is called "uniform circular motion".

2. Uniform circular motion is the most common and simplest motion in circular motion (because velocity is a vector, uniform circular motion actually refers to uniform circular motion).