压力类型
物理学教导力是质量乘以加速度，但如果需要想象力是什么，它如何影响身体？很简单。想象一下推或拉一个物体，物体的推或拉是对物体施加力，如果物体显示出一些位移，就会有一个有限的力值。单位面积作用在物体上的力称为压力。压力和力密切相关，物体上的力越大，物体上的压力就越大。
作用力和类型
当力施加到物体上时，它可以启动对象的运动或停止其运动，或者可以根据施加的力类型帮助改变对象的形状或大小。如果一个身体受到两个力，这些力可能会增加或可能会减少整体力。这是因为力是一个向量，也就是说，它既有大小又有方向。因此，力的方向也很重要。
- 如果施加在物体上的力是同一个方向的，那么这些力会加起来，整体的力会更大。
- 如果施加在物体上的力方向相反，则力不会相加，整体力会更小。
The formula for Force is given as, F = Ma.
The SI unit of Force is Newton (N)
有许多类型的力量可以应用或自然存在于宇宙中。接触力是身体应该接触的一种类型，例如，击球或推箱子。肌肉力是由于施加的力而使肌肉处于紧张状态的力，例如，推动任何物体都会对肌肉施加力。摩擦力是存在于两个表面之间的力的类型，它抵抗物体的运动并且始终沿与运动相反的方向起作用。
非接触力是身体不接触但施加力的力。磁力、重力等力是非接触力。静电力是两个电荷相互施加力的力，同种电荷相互排斥，异种电荷相互吸引。重力是由两个质量施加的，质量的大小在产生力的过程中起最大作用，例如，重力是地球施加的重力。
压力
压力定义为每单位面积的力。这直接意味着面积会影响施加的压力量，如果施加力的面积较小，则施加力的面积越大，压力就越小。
压力的 SI 单位是 N/m 2 。此外，不同类型的压力在标准形式中具有不同的单位。
Formula for Pressure, P = F/A
现实生活中的压力示例：
- 切水果或蔬菜时，用锋利的刀代替钝刀，这样对水果施加的压力更大，水果更容易切。
- 钉在墙上的钉子末端非常尖，以便对墙壁施加更大的压力。
- 搬运工在头上放一块圆布，以增加面积，压力较小，以便可以施加重量级。
压力类型
有不同类型的压力，它们有不同的压力单位。例如，atm 是用于大气压的单位。让我们来看看存在的不同类型的压力，
气压：
Air is present above the sea level, and there are so many layers, the higher it goes, air starts to exert more and more pressure, and the pressure exerted by the air in the atmosphere is known as atmospheric pressure. The unit used for measuring the atmospheric pressure is atm.
The human body also has Pressure inside the body which compensates for the pressure present in the atmosphere, Therefore, Human body does not feel it. The atmospheric pressure varies due to the fluctuation in the atmosphere. The weight of air is responsible for the atmospheric pressure, and it is essential for the life on earth.
The instrument used to measure the atmospheric pressure is called Barometer. Barometer has Mercury filled, and it is vacuumed in the rest of the space. It measures Patm as pgh.
Patm = pgh
Where, p = Density of the air
g = acceleration due to gravity
h = height of the mercury.
绝对压力：
Absolute Pressure is the pressure with respect to Zero pressure present, that is, with respect to no pressure present in the empty, free-space. No pressure is obtained in vacuum. Absolute pressure is denoted as Pabs
不同的压力：
Differential Pressure, as the name suggests, is the difference between the two values of pressure. The pressure obtained will be lesser than either of the pressures and unit is same for the differential pressure obtained.
Pd = P2 – P1
表压：
Gauge pressure is also known as Overpressure, and it is the recently invented pressure. The differential pressure obtained from atmospheric pressure and absolute pressure is known as overpressure or gauge pressure.
下图显示了表压、绝压、大气压、
Note: In order to measure Blood pressure, an inflatable cuff is placed on the forearm, Blood flow is detected and the corresponding pressures are measured in the mercury- filled manometer (Device used to measure pressure). The maximum blood pressure is called as Systolic Pressure. The minimum blood pressure is called as Diastolic pressure.
示例问题
问题1：物体的质量为50kgs，物体正在加速，加速度为2 m/sec 2 。求物体产生的力值。
解决方案：
Given: Mass= 50kgs
Acceleration (a)= 2 m/sec2
Force = Mass × Acceleration
Force = 50 × 2
Force= 100N
问题2：汽车产生的力是100kgs的质量等于300N。求汽车的加速度。
解决方案：
Given : Mass= 100kgs
Force= 300N
Force = Mass × Acceleration
Acceleration = Force/Mass
Acceleration = 300/100
Acceleration (a)= 3 m/sec2
问题3：表压和差压有什么区别？
回答：
Differential pressure is the difference between the two pressure while gauge pressure or overpressure is defined as the difference between absolute pressure and atmospheric pressure. Therefore, we can conclude that gauge pressure can be differential pressure but not vice-versa.
问题4：为什么书包提供的背带最好做得更宽一些。如果包带不那么宽会怎样？
回答：
The bag straps are put on shoulders and based on how heavy the bag is, there is certain pressure exerted on the shoulder, if the straps are wider, the area covered would be more and hence, the pressure exerted on the shoulders would be less. However, if the straps are not wide enough, the area covered would be really less and the pressure exerted may injure the shoulders.
问题5：一个物体被50N的力推，物体的底面是10m 2 ，物体对表面的压力是多少？
解决方案：
Given: Force= 50N
Area= 10m2
Pressure= Force/area
Pressure(P) = 50/10
Pressure (P)= 5 N/m2
问题6：一个物体施加了10N/m 2的压力，施加压力的面积是30m 2 。找到所需的力量？
解决方案：
Given: Pressure= 10N/m2
Area= 30m2
Force= Pressure × Area
Force= 10 × 30
Force= 300N