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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? Description

##### Description: These notes cover the formulas of the next exam
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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

∙ 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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