Seek the laws of circular motion and flat throwing motion urgently! ! ! Please everyone! !

Flat throwing motion: an object is thrown at a certain initial velocity level. If an object is only subjected to gravity, this motion is called flat throwing motion.

Quasi-flat throwing motion: after an object is thrown horizontally, it moves in a straight line at a uniform speed in the horizontal direction (excluding air resistance) (just like flat throwing motion), while the motion in the vertical direction is not only affected by gravity, but also by other forces in the vertical direction.

The difference between quasi-flat throwing action and flat throwing action

The difference between the two is: after the object is thrown, is there any other force besides gravity in the vertical direction? The catch is a flat throw.

Conditions of quasi-planar parabolic motion;

(1) Under the constant force;

② The initial velocity direction is perpendicular to the constant force.

For example, the swing ball swings around the suspension point in the vertical plane, and when it reaches the lowest point, the rope suddenly breaks, and then the swing ball moves; The umbrella rotates around the vertical axis, and the movement (excluding air resistance) made after the water drops on the umbrella edge are all examples similar to the flat throwing movement.

Circular motion: When a particle moves on a circle with R as the center and R as the radius, that is, its trajectory is circular, it is called "circular motion".

It is also divided into uniform circular motion and variable-speed circular motion (uniform motion mainly refers to the constant speed and the constant force, but the speed changes because the direction of the force changes)

The main differences among them are as follows: (1) The flat throwing action is only influenced by gravity; Quasi-flat throwing action is to change gravity into other forces on the basis of flat throwing action; Circular motion is not a constant force but a variable force (because at least the direction of the force has changed again)