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physics:forces [2021/01/14 15:17] – epix | physics:forces [2021/03/11 03:09] (current) – [Tension] added link to incline plane epix | ||
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====== Forces ====== | ====== Forces ====== | ||
- | A force is an interaction that would change the motion of a given object. | + | A force is an interaction that would change the motion of a given object. The diagram below shows the forces typical of an object in any given system. |
- | Mass is the density of the object while weight | + | {{: |
- | Volume | + | |
+ | Where: | ||
+ | * $F_n$ is the normal force | ||
+ | * $F_r$ is friction | ||
+ | * $F_a$ is the applied force | ||
+ | * and $W$ being weight | ||
===== Weight ===== | ===== Weight ===== | ||
- | Weight is mass multiplied by gravity. $w = mg$ | + | Mass is the density of the object while weight is its resistance against gravity. Volume is related to mass via density. |
+ | |||
+ | ===== Applied Force ===== | ||
+ | Applied force is the force exerted on an object in a system externally. Typically it's given to you. It can also be substituted with a force like tension. | ||
+ | |||
+ | ===== Normal Force ===== | ||
+ | The normal force is what is exerted when a object rests against another. Typically, this force is equivalent to the weight of the object(($F_n = W$)), unless it is a special situation like an [[physics: | ||
===== Friction ===== | ===== Friction ===== | ||
- | Friction is a force caused by the collision of surfaces that are inherently uneven. It is mathematically defined as $F_r = \mu F_n$ where $F_r$ is friction, $F_n$ is the normal force((opposing force of weight when object is resting on a surface)), and $\mu$ being the coefficient of friction(([[physics: | + | Friction is a force caused by the collision of surfaces that are inherently uneven. It is mathematically defined as $F_r = \mu F_n$ where $F_r$ is friction, $F_n$ is the normal force((opposing force of weight when object is resting on a surface)), and $\mu$ being the coefficient of friction(([[physics: |
+ | |||
+ | ==== Static Friction ==== | ||
+ | This type of friction prevents an object from sliding against another surface parallel to the contact area. | ||
+ | |||
+ | ==== Kinetic Friction ==== | ||
+ | This type of friction slows an object instead of preventing its movement. Direction is opposite to the object' | ||
+ | ===== Tension ===== | ||
+ | See: [[physics: | ||
+ | |||
+ | Tension is a force that a rope((/ | ||
+ | |||
+ | ==== Finding Acceleration ==== | ||
+ | The acceleration of tension can be calculated by summing the forces of each object under tension by the sum of their masses(($a = \frac{\sum F}{m}$ where $F$ are the forces and $m$ is the total mass of the objects)). | ||
+ | |||
+ | === Force of Tension === | ||
+ | FIXME No clue if this is right, disregard if you're doing something important | ||
+ | |||
+ | You can use [[physics: | ||
+ | |||
+ | ==== From Weight and Net Force ==== | ||
+ | Tension can also be associated as equal to the net force of the system minus an acting force, typically weight $F_{net} = T - W$. | ||
+ |