Free Body Diagrams. Push or pull The cause of an acceleration or the change in an object’s...
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Transcript of Free Body Diagrams. Push or pull The cause of an acceleration or the change in an object’s...
![Page 1: Free Body Diagrams. Push or pull The cause of an acceleration or the change in an object’s velocity (pg. 124)](https://reader036.fdocuments.in/reader036/viewer/2022082710/56649e7a5503460f94b7a903/html5/thumbnails/1.jpg)
TYPES OF FORCESFree Body Diagrams
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Force
Push or pull The cause of an acceleration or the
change in an object’s velocity (pg. 124)
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Force can act through contact or distance (pg. 125)
Contact force- force that arises from the physical contact of two objects Ex: pulling a spring, pull a wagon, pushing car
Field force- force that can exist between objects, even in the absence of physical contact between the objects Ex: gravity, electrical charges
![Page 4: Free Body Diagrams. Push or pull The cause of an acceleration or the change in an object’s velocity (pg. 124)](https://reader036.fdocuments.in/reader036/viewer/2022082710/56649e7a5503460f94b7a903/html5/thumbnails/4.jpg)
Applied Force
Force which is applied to an object by a person or another object Fapp: student pushing or pulling a desk across
the room
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Gravity Force
Force with which the earth, moon, or other massively large object attracts another object towards itself. (By definition, this is the weight of the object) Fgrav: = mass x acceleration due to
gravity Where acceleration due to gravity is 9.8
m/s2
![Page 6: Free Body Diagrams. Push or pull The cause of an acceleration or the change in an object’s velocity (pg. 124)](https://reader036.fdocuments.in/reader036/viewer/2022082710/56649e7a5503460f94b7a903/html5/thumbnails/6.jpg)
Normal Force
The support force exerted upon an object which is in contact with another stable object. Ex: book resting on a table, the table is
exerting an upward force upon the book in order to support the weight of the book
Fnorm
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Friction Force
The force exerted by a surface as an object moves across it or makes an effort to move across it Ffrict = (“mu”) (fnorm) Sliding and static friction
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Air Resistance Force
Force which acts upon objects as they travel through air (often observed to oppose the motion of an object)
Fair : skydiver, or downhill skier
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Tension Force
Force which is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends. Ftens:
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Spring Force
Force exerted by a compressed or stretched spring upon any object which is attached to it. Fspring:
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Coefficient of Friction
The 'coefficient of friction' (COF), symbolized by the Greek letter µ “mu”, is a dimensionless scalar value which describes the ratio of the force of friction between two bodies and the force pressing them together. The coefficient of friction depends on the materials used; for example, ice on steel has a low coefficient of friction, while rubber on pavement has a high coefficient of friction. Coefficients of friction range from near zero to greater than one – under good conditions, a tire on concrete may have a coefficient of friction of 1.7
“mu” =coefficient of friction
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Problem 1
A book is at rest on a table top. Draw the free body diagram that depicts this action.
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An egg is free-falling from a nest in a tree. Neglect air resistance. Draw a free-body diagram showing the forces involved
Problem 2
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Problem 3
A flying squirrel is gliding (no wing flaps) from a tree to the ground at constant velocity. Consider air resistance. A free body diagram for this situation looks like…
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Problem 4
A rightward force is applied to a book in order to move it across a desk. Consider frictional forces. Neglect air resistance. Construct a free-body diagram. Let’s see what this one looks like.