Physics question: What is the difference between pressure and force?

"If an object is not moving, it has no force" is not correct. An object can be under pressure from left and right equally" for example. However it wouldn't move. When you press a door, your feet press to the flow, backward. Thus, you are under force from two opposite side equally. To make it clear for yourself, imagine you are pressing a door when you are standing over an ice floor. Can you do that? Off-course not. There is not enough roughness that you can press the door.

Pressure is force per unit area This means that the same force, applied to a larger area, will give lower pressure

Presure is the force divided by the area. Pressure is proportional to force. Same force exerts more or less pressure depending on the area on which the force is acting. More area same force => less pressure Less area same force => more pressure Same area less force => less pressure Same area more force => more pressure

If you apply force to something yet it doesn't move it's because some other force is balancing it so that the total force acting on, say, the door, is zero. In the example you mention, the reaction force comes from the door frame. It's easiest to understand when the reaction force comes from something compressible, like a spring. But in fact almost all materials are more or less compressible. You may be able to compress the door frame by a micrometer or some such, which causes it force back like a spring. The best known example is when you stand on the ground. Gravity pulls you downwards but you don't fall through the ground because the floor acts on your feet with a reaction force. As for the title of your question: "Pressure" has a different meaning is physics. When we say that the air pressure is 100,000 Pascal (=one atmosphere), it means that each square meter of a surface is subject to a force of 100,000 Newton from all the air molecules that bounce into the surface.

forse depend o n mass of object & accelaration of object, if accelaration is zer then moss become zero, t is a vecter quantity, pressure depends on forse applied & area on which it applied, it is scaler quantity ,

Force is mass x acceleration while pressure is force / area. When you exert force to an object but it does not move, you can make use of Newton's Third law of motion saying that for every action, there is a reaction. In Physics, when objects don't move, it is said to be in equilibrium. To make the object move (that is , to disturb the equilibrium), the sum of all torques should be zero and the sum of all forces should be zero. THis means that when you "preess hard against a door, or arm wrestling, for example, I am not moving", there are forces acting on the bodies involved, only that the sum of all the torques and the sum of those forces are equa to zero. That is why the objects do not move.

You're exerting force on the door but the door itself is resisting. If the door weren't there you would go plummeting through the door way. I'm just thinking out loud really. Same with arm wrestling. Your acceleration is being negated by the other fellows (hopefully not so much if you're doing well) but the acceleration is still there.

F = P * area or P = F / area Pressure is force per square unit of area. that's the difference Tires are inflated to 30 lbs per square inch. So if the weight supported by 1 tire is 1000 lbs, you can determine how much of the tire is in contact with the ground. 1000 / 30 = 33.33 square inches of tire touching the ground (assuming a perfectly elastic tire).

Pressure is the feeling just before a fart and force is letting "er"go