還有3角函數?? SIN COS??
V=VO + at
- 2 decades agoFavorite Answer
Newton's second law of motion explains how an object will change velocity if it is pushed or pulled upon.
Firstly, this law states that if you do place a force on an object, it will accelerate, i.e., change its velocity, and it will change its velocity in the direction of the force.
Secondly, this acceleration is directly proportional to the force. For example, if you are pushing on an object, causing it to accelerate, and then you push, say, three times harder, the acceleration will be three times greater.
Thirdly, this acceleration is inversely proportional to the mass of the object. For example, if you are pushing equally on two objects, and one of the objects has five times more mass than the other, it will accelerate at one fifth the acceleration of the other.
In mathematics, the trigonometric functions are functions of an angle, important when studying triangles and modeling periodic phenomena. They are commonly defined as ratios of two sides of a right triangle containing the angle, and can equivalently be defined as the lengths of various line segments from a unit circle. More modern definitions express them as infinite series or as solutions of certain differential equations, allowing their extension to positive and negative values and even to complex numbers. All of these approaches will be presented below.
In modern usage, there are six basic trigonometric functions, which are tabulated below along with equations relating them to one another. (Especially in the case of the last four, these relations are often taken as the definitions of those functions, but one can equally define them geometrically or by other means and derive the relations.)
Newton's second law: fundamental law of dynamics
The acceleration of an object equals the total force acting on it, divided by its (constant) mass.
m is the mass of the object in question,
F is the total force acting on the object
a is the object's acceleration, i.e., the rate of change of its velocity with respect to time
For example, if a bowstring exerts a constant force of 100 newtons on an arrow having a mass of 0.10 kg, then the arrow's acceleration will be 1000 m/s2 until it leaves the bow (after which the arrow will stop speeding up).
When the forces on the object all act along the same line, they can be added as positive and negative numbers, depending on their direction. When they do not all act along the same line, the total must be found by vector addition.
The quantity m, or mass, is a characteristic of the object. The greater the total force acting on an object, the greater the change in its acceleration will be. This equation, therefore, indirectly defines the concept of mass.
In the equation, F = ma, a is directly measurable but F is not. The second law only has meaning if we are able to assert, in advance, the value of F. Rules for calculating force include Newton's law of universal gravitation.
- 傲憾青天御風行Lv 52 decades ago
Newton's second law :
Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. As learned in the "The Rocket Simulation" Lab, the acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force of propulsion acting upon the rocket-chair increased, the acceleration of the rocket-chair increased. As the mass of the rocket-chair increased, the acceleration of the rocket-chair decreased.
trigonometric function ：
A function of an angle expressed as the ratio of two of the sides of a right triangle that contains that angle; the sine, cosine, tangent, cotangent, secant, and cosecant. Also called circular function.
V=VO + at
以上這些公式是由牛頓第二運動定律演變而來的3大公式, 這3個公式可以計算出所有運動狀態下的未知數......也就是可以解所有的力學的題目啦 ~~~~
舉例來說: 1物體從靜止開始自由落體落下, 3秒後該物體的速度 V=V0+at = 0+9.81*3=29.43m/s......其他以此類推 ~~~~Source(s): 網址1:http://www.glenbrook.k12.il.us/gbssci/phys/Class/n...