Transcript F 2 - Pine Tree ISD

By Physics Students
It’s The
Law
Net
Forces
Name That Decorate
What’s My
Is That
Force
That Tree! Acceleration Normal?
C
C
C
C
C
C
B
B
B
B
B
B
A
A
A
A
A
A
Honors
Honors
Honors
Honors
Honors
Honors
Graduate
Graduate
Graduate
Graduate
Graduate
Graduate
Final Jeopardy
You Can Hit A
Golf Ball 100m
But A Softball
Only Goes 40m.
nd
2
What is Newton’s
Law (mass inversely
proportional to
acceleration)?
You Drove Too
Fast And The
Box In The
Back of The
Truck Fell Off.
What is
Newton’s
First Law?
If That Planet
Would Stop Pulling
On Me, I Would
Take Off On My
Own.
What is
Newton’s First
Law?
This Tells You What ΣF
Is Equal To, Before You
Know If It’s In
Equilibrium or Not.
What is
nd
Newton’s 2 Law
(ΣF = ma)?
When I Push You,
You Do This – Even If
You Don’t Mean To!!
What is “Push Back”
rd
- Newton’s 3 Law
(for every force there
is an equal and
opposite force)?
The ΣF Acting On A
Car Operating Under
“Cruise Control”.
What is
ΣF = Zero (object
in equilibrium)?
The ΣF of
F1=38N 42°
and F2=118N -12.5°
What is
ΣF = 144N 0°
?
The ΣF causing a 3kg
object to accelerate at
2
3 m/s in the x-direction
2
and 7.5 m/s in the
y-direction.
What is
24.2N 68.2°?
For A Block On A Ramp
Inclined At An Angle θ,
The Forces (or
Components) Making
Up The ΣF in the ydirection.
What is
ΣFy = FN – Fg sin(90-θ)?
The ΣF On An Object In
Circular Motion At Constant
Speed Is Equal To This.
What is
2
ΣF = m(v /R) (mass x
centripetal acceleration)?
It Parallels The
Surface But Is
Contradictory To
Motion.
What is Frictional
Force, Ff = μFN?
It Always Points To
The Center of
Whatever Planet
You’re On, Whether
Touching Or Not.
What is
Gravitational Force,
Fg = mag?
It Never Shows Up
Unannounced And Can
Go Any Direction It
Wants When It’s There.
What Is
Applied Force,
F a?
If This Gets Bigger, it
Makes Sliding An
Object More Difficult.
What Is Normal
Force, FN?
A Type of Force That
Exists Without Contact.
If The “Jedi Force”
Were Real, It Would Be
In This Class.
What Is A
Field Force?
m = 42 kg
x
y
0N
FN
0N
- 412 N
m = 42
kg
20°
400 N
x
y
0N
FN
0N
- 412N
376 N
137 N
-μ FN
0N
m = 3 kg
28°
85 N
x
y
0N
- FN
0N
- 29.4 N
- 40 N
75 N
μ FN
0N
m1
θ = 32°
m2
Weight of m1 = 750 N; weight of hanging
block = 400 N; block sliding DOWN incline.
x
y
0N
FN
- 397 N
- 636 N
- 400 N
0N
μ FN
0N
325 N
m1
θ = 25°
m1 = 75 kg; block not moving
x
y
0N
FN
- 311 N
- 667 N
295 N
- 137 N
μ FN
0N
ΣF = 38N Acting
On A 4.2 kg Mass.
What Is
2
9.05 m/s ?
400N
129N
μk = 0.44
What Is
2
a = 26.1 m/s ?
A 40 kg Object Falling
In Presence of A
Constant 220 N Air
Resistance.
What is
2
a = 4.31 m/s
(down)?
A Roller Coaster
Going 32 m/s Over
The Top Of A Peak
Of Radius 50m.
What Is
2
2
a = (32) /50= 20.5 m/s
(down)?
[Pulling 2 g’s, If You’re
Counting!]
The Force That Causes A
0.200 kg Softball To Leave
A Slingshot At 15 m/s After
A 0.75 m Travel.
What is
ΣF = 30 N?
2
15
a 
2(0.75)
Using
2
vf
=
2
vi
+ 2aΔx
45 kg
What Is
FN = 441N 90°?
200N
45°
45 kg
What Is
FN = 583 N 90°?
100N
100N
45°
45 kg
30°
What Is
FN = 321 N 90°?
Blocks in Equilibrium
m1
θ = 32°
m2
m1 = 75 kg and m2 = 130 kg.
What Is
FN = 624N 90°?
Force of Seat On 75 kg
Pilot In Jet At Bottom
Of Circular Path With
Radius 600m Traveling
At Constant 120 m/s.
What Is
FN = 1064 N (up)?