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Forces - Coggle Diagram
Forces
Contact Forces
Frictional Force: The force exerted by a surface as an object moves across it or is pushed. Friction usually opposes the motion of an object. For example, if someone pushes a water bottle across a table, the friction between the water bottle and the table exerts a force in the opposite direction of where you're pushing it. It depends on the friction of both surfaces and the force in which they are pressed together.
Kinetic Friction:
Kinetic friction is the force that acts against a force that is trying to continue moving an object. it is the force that acts between moving surfaces. For example, if you managed to start moving the car, the friction between the wheels and the ground while the car is moving would be the kinetic friction.
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Static Friction
Static friction results when the surfaces of 2 objects are at rest relative to one another and a force exists on one of the objects to set it into motion relative to the other object. It is the force that acts against another force that is trying to get the object moving. For example, if you were to apply 10 Newton force to a car, the car would probably stay in its place. This is because the static friction of the car and the ground is greater than the force that you applied.
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Air Resistance Force: This is a special kind of frictional force that applies to objects as they travel through the air. It usually opposes the motion of the object, but it is usually neglected because of its small magnitude and because it is hard to predict its value.
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Tension Force: The force that is transmitted through a rope, string, wire, cable or anything that can be pulled from opposite ends. This force changes in proportion to the length of the object that is being pulled from opposite sides.
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Applied Force: A force applied to an object by another object. For example, if a person pushes a book across a table, they are exerting an applied force on the book in order to make it move.
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Normal Force: The force that acts on objects that are in contact with another stable object. For example, if a car is parked on a street, then the normal force in counteracting the gravitational force equally.
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Spring Force: spring force is exerted by a stretched or compressed spring upon any object that is attached to it. Any object that compresses or stretches a spring will always be acted upon by a force that restores the object to its resting position. For most springs, the magnitude of the force is directly proportional to how compressed or stretched it is.
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Newton's Laws of Motion
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Newton's 3rd Law: When an object exerts a force on a second object, the 2nd object exerts an equal and opposite force on the 1st object.
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Newton's 1st Law: An object will stay at rest or in motion going the same speed and direction unless acted upon by an unbalanced force.
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Free Body Diagrams
Purpose
The purpose of free body diagrams are to help people understand the differences or balances in forces and how it can act upon objects. It is a visual way of explaining how forces act on objects and why some things accelerate and others don't when forces are or aren't applied.
Design
The way free body diagrams are designed is with a center dot or box which is the object. How you can show the different forces acting upon the object is by drawing arrows off of it in different directions. In most cases, unless specified, left will be negative and right will be positive. If you want to tell if an object is accelerating when looking at a free body diagram, you see if 2 arrows pointing in opposite directions equal the same amount or not. If they do have the same the value, then the forces offset each other, if they don't then the object would be accelerating in the direction in which one arrow has a higher value.
Example
In this example, the object would not be accelerating. I know this because the frictional force is equal to the applied force and the normal force is equal to the gravitational force. If the forces applied to an object are equal, then the object cannot be accelerating, this is according to Newton's 2nd Law.
Acceleration
No
Two equal forces
If there are 2 equal forces or no forces acting on the object then the object either is moving at a constant velocity or it won't be moving at all
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Yes
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Distance Forces
Electrical Force: Electrical force is the attractive force between electrons and a nucleus. An example of this is the charge in a light bulb.
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Magnetic Force: The attraction or repulsion created between electrically charged particles because of their motion. An example of this is a compass.
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Gravitational Force: This is the force that everything on the earth, moon, and any other extremely massive object will experience. It is where the extremely massive object attracts another object towards itself. This is where some people get confused about the difference between mass and weight.
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