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CLEMSON / Physics / PHYS 1220 / What does it mean when a change in velocity is negative?

What does it mean when a change in velocity is negative?

What does it mean when a change in velocity is negative?

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Exam 2 Study Guide


What does it mean when a change in velocity is negative?



Formulas to Know

∙ Static friction  

Fsmax=μs FN 

μs - The coefficient of friction (dependent on what the surface is) F N - Normal Force

∙ Kinetic Friction  

Fk=μk FN 

μk -coefficient of kinetic friction (unitless)

∙ Acceleration

ax=FT−Fk 

m

FT- The force of tension


What is the reference area for drag force?



Don't forget about the age old question of What is the meaning of rigid in packaging?

∙ Rolling friction  

Fr=μrF N 

μr -coefficient of rolling friction

∙ Drag force

F D=−bv

b- the experimental constant. It is negative to show it’s moving opposite  velocity (v). Don't forget about the age old question of What is the meaning of aromatic anions?

∙ For the drag force on blunt objects (What we mostly will work with) drag force is shown by:

F D=12C Aρ v2 

C- The drag coefficient

ρ- The density of the medium

A- The object’s perpendicular cross-sectional area


Who discovered centripetal force?



v- The speed of the objects

∙ The magnitude of centripetal force is found by:

F C=mv2r If you want to learn more check out What is the meaning of a specific epithet?

If the origin is in a polar coordinate system

F C=−mv2 

rr^

Keplers Laws

Planetary Motion

a=r p+r A 

2

1. rp- The perihelion distance

2. rA- The aphelion distance

3. This answer comes in Astronomical Units or AU

4. 1 AU=1.5E11 meters

∙ Were only going to consider the first and the third since they’re the ones  formulas apply to.

∙ In Kepler’s third law it says that the square of a planet’s period T is  proportional to the cube of its semi-major axis

2 =a[AU ] 

T[ yr ] 

3

∙ Newton’s law of universal gravity shows:

F G=Gm1m2 

r2 

G- The gravitational constant= 6.673E-11

∙ The gravitational field of any source can be found from:

Unit vector pointing away

g (r)=−GM Don't forget about the age old question of What is the meaning of social control?

r2(¿ particle) Don't forget about the age old question of How do i start a farmers market in my community?

G-Gravitational constant

M- Mass

r- Radius

∙ Kinetic Energy

K=12m v2 

This answer is in Joules

∙ Potential Energy  

PE=mgh If you want to learn more check out What is the most significant agent of socialization?

∙ To find gravitational potential energy:

UG (r)=−Gm1m2 

r

∙ Elastic potential energy:

Ue=12k x2 

Or

Ue=12k y2 

K= the spring constant

∙ The sum of a systems Potential and Kinetic energy is its mechanical energy.  This is shown by:

E=K+U

∙ The conservation of mechanical energy is shown by:

∆ K+∆U =0

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