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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?



∙ Rolling friction  

Fr=μrF N 

μr -coefficient of rolling friction

∙ Drag force If you want to learn more check out What is the meaning of rigid in packaging?

F D=−bv

b- the experimental constant. It is negative to show it’s moving opposite  velocity (v).

∙ 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?



If you want to learn more check out What is the other term for arenes?

v- The speed of the objects

∙ The magnitude of centripetal force is found by:

F C=mv2r

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. We also discuss several other topics like What is the meaning of a specific epithet?

∙ 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: We also discuss several other topics like What is the meaning of formal social control?

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

r2(¿ particle)

G-Gravitational constant

M- Mass

r- Radius

∙ Kinetic Energy

K=12m v2 

This answer is in Joules

∙ Potential Energy  

PE=mgh

∙ To find gravitational potential energy:

UG (r)=−Gm1m2 We also discuss several other topics like Did the doctors who took part in genie’s study act as professionally as they should have?
We also discuss several other topics like How are supply and demand is influenced by the labor market?

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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