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Around us has very many different forms the object movement, so long as observes carefully middle, can discover the interesting rule and the phenomenon.


The strength may change the object the state of motion, causes the static object migration, also may cause in the movement the object static.For example the player in the static soccer the application of force, then may cause the soccer trundle; Similarly, he also may make an effort to cause in the trundle the soccer static.


When the object carries on the translation, its movement direction and the application of force direction is same.We impel the object forward, the object then forward motion; We backward pull the object, the object then backward moves.Therefore, our application of force, may change the object movement the direction.


In the different movement form ── translation, the circular motion and the clock pendulum movement, the strength increase which we execute, the object movement speed speed up; On the contrary, executes strength reduction, object movement on speed on slow-down.For example we use the big strength impetus swing, the swing swinging scope to be able to be big, but the speed also can speed up.


When the object rubs mutually, can because of contact has one kind of resistance, is called the friction force, it can reduce speed the object movement the speed.Friction force size and contact face whether rough related: The object surface is rougher, the friction force which produces is bigger.In the daily life, we sedulously increase the friction force frequently, by facilitates the work, or prevented the accident occurs.For example the shoe sole pit grain may increase the shoes and the road surface friction force, prevents to slip.

A lot of objects of different forms of our surroundings existence exercise, as long as with quiet attention observe, will find the in the middle interesting regulation and the phenomenon.

The power can change the exercise appearance of the object, making the static object move, can also make the medium object quiet of exercise.For example the player applies on static football, then can make football roll over;equally, he can also make an effort to make roll over the medium football quiet.

When object carry on the straight line exercise, it the direction that exercise is similar to the direction that apply.We forward push the object, the object then and forward moves;we backward pull the object, the object then and backward moves.Therefore, we apply, the direction that exercise for the convertibility object.

In different exercise form-- straight line exercise, circumference exercise and clock put exercise, we increase the power of, the object exercise of speed speed;contrary, reduce the power of, object the exercise reduces for the speed slowly.For example we use the bigger power promotion swing, the swing swing of the range will compare greatly, and the speed also will speed.

When object rub each other, will produce a kind of resistance because of get in touch with, be called the friction, it will reduce the speed of the slow object exercise.The size of the friction has something to do with get in touch with face whether roughly: the object surface is more rough, output friction more big.In the daily life, we usually intentionally increase the friction, working with the convenience, or preventing the surprised occurrence from.For example the pit 紋 of the shoe sole can increase the friction that the shoes and road face, keeping us from slip and fall down.

2008-03-30 18:55:08 補充：
sor

中文果個pit 紋

即係pit line

sorry...sorry

Around us has very many different forms the object movement, so long
as observes carefully middle, can discover the interesting rule and
the phenomenon.



The strength may change the object the state of motion, causes the
static object migration, also may cause in the movement the object
static. For example the player in the static soccer 施力, then may
cause the soccer to roll; Similarly, he also may make an effort to
cause to roll the soccer static.



When the object carries on the translation, its movement direction and
施力 the direction is same. We impel the object to front, the object
then forward motion; We 向後 pull the object, object then rearward
movement. Therefore, we 施力, may change the object movement the
direction.



In the different movement form - - translation, the circular motion
and 鐘擺 in the movement, the strength increase which we executes,
the object movement speed speeds up; On the contrary, executes the
strength reduction, the object movement reduces speed on the speed.
For example we use the bigger strength impetus swing, the scope which
the swing swings to be able to be bigger, but the speed also can
speed up.



When the object mutually rubs, can because of contact has one kind of
resistance, is called the friction force, it can reduce speed the
object movement the speed. Friction force size and contact face are
whether rough related: Object surface rougher, produces the friction
force is bigger. In the daily life, we frequently sedulously increase
the friction force, facilitates the work, or prevented the accident
occurs. For example the shoe sole pit grain may increase the shoes and
the road surface friction force, prevents to slip.