Newton's laws of motion[3]
Equations of motion (Second Law)
Laws that show the relation between force and the motion are Newton's laws of motion.
This consists of three laws. (See below)
| First Law | If force doesn't act, the object continues a state as it is. |
| Second Law | If force acts on the object, the acceleration proportional to mass is caused. |
| Third law | When force acts on the object, the object is pushed back by the force of the same size. |
Here, the law third law of motion, trying to explain the law of action and reaction.
For example, hand pressed to the surface of the desk.
Strengthen the more pressing, the greater the force felt by the hand.
This is a desk and push hands, push back the hand from the power of the same size desk.
In this case, the force pressing the hand desk "action", the power to push back the hand desk "reaction" he said.
Action and reaction, the size of a pair of power is the opposite direction is equal.
This section illustrates the relationship between the desk and hands,
If you hit the wall, the ball
If you want to stretch the spring,
If objects attract each other, the gravitational and electromagnetic force
Is a typical example of the action and reaction as well as a pair.
Establishment of a pair of action and reaction that is not a special case.
Pair of action and reaction are all of one's muscles to be realized.
That this law of action and reaction.
In other words, force can not exist alone.
What is always in force, only when there is action and reaction pair.
First law of action and reaction of the three laws of Newton's laws of motion.
If you push down on the same force that pulled at the same power at the close.
This is the law of action and reaction.
Pressing the desk in the cases of hand, is easy to understand from the work desk and wonder if the push carts rumbling.
When you push the truck, hands, feel the power.
This is evidence that the truck is pushing back the hand.
In this case, "the truck pushing force" and "ability to push back the hand truck" are equal.
But since moving truck is going down "is bigger than the force pressing the truck" and misleading.
"Press the power truck" and "ability to push back the hand truck" is a direction of action and reaction is always the subject of high treason.
Does, even though the power of harmony and direction of high treason, is also the question of why or truck moving.
This question has been confused with the asymmetry of power.
"Balancing power" and "action-reaction" that is separate from it.
Humans walk with the friction of the sole.
There is friction between the wheels of the truck to the ground.
The friction of the sole, but the big move is down from the friction of the wheels from the truck.
And as long as the press truck, which has caused the power of high treason and orientation between the hand truck.
It is easy to understand that the case to try to put power and for a very heavy truck to push is imaged.
In this case, considerable power is sure to be applied to the arm, and to feel power also in the shoe sole that is straddling at the same time by me.
This shoe sole's power and power in the equal large opposite direction are caused in the wheel as a frictional force.
The truck moves with the shoe sole by the difference of the frictional force of the wheel.
Also, I can imagine an extremely small friction soles. (Wheel of the truck is normal friction)
Also press the truck, slick and slippery soles, can not propel the truck before.
Pressing force is the same truck, and proceed from there is no friction at the bottom of shoes.
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