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By Physics Students
| Date post: | 14-Jan-2016 |
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By Physics Students
It’s The Law
Net Forces
Name That Force
Decorate That Tree!
What’s My Acceleration
Is That 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.
What is Newton’s 2nd 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 Newton’s 2nd Law
(ΣF = ma)?
When I Push You, You Do This – Even If You Don’t Mean
To!!
What is “Push Back” - Newton’s 3rd 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 3 m/s2 in the x-direction
and 7.5 m/s2 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 y-
direction.
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 ΣF = m(v2/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,
Fa?
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
0 N
0 N
FN
- 412 N
x y
m = 42 kg
400 N
20°
0 N
0 N
376 N
-μ FN
FN
- 412N
137 N
0 N
x y
m = 3 kg
28°
85 N
x y
- FN
- 29.4 N
75 N
0 N
0 N
0 N
- 40 N
μ FN
m1
θ = 32°m2
Weight of m1 = 750 N; weight of hanging block = 400 N; block sliding DOWN incline.
x y
0 N
- 397 N
- 400 N
μ FN
FN
- 636 N
0 N
0 N
m1
θ = 25°
325 N
m1 = 75 kg; block not moving
x y
0 N
- 311 N
295 N
μ FN
FN
- 667 N
- 137 N
0 N
ΣF = 38N Acting On A 4.2 kg Mass.
What Is 9.05 m/s2?
129N400N
μk = 0.44
What Is a = 26.1 m/s2?
A 40 kg Object Falling In Presence of A
Constant 220 N Air Resistance.
What isa = 4.31 m/s2
(down)?
A Roller Coaster Going 32 m/s Over The Top Of A Peak
Of Radius 50m.
What Isa = (32)2/50= 20.5 m/s2
(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?
Using vf2 = vi
2 + 2aΔx
)75.0(2
152a
45 kg
What Is FN = 441N 90°?
45 kg
45°
200N
What Is FN = 583 N 90°?
45 kg45°
100N
30°
100N
What IsFN = 321 N 90°?
m1 = 75 kg and m2 = 130 kg.
Blocks in Equilibrium
m1
θ = 32°m2
What IsFN = 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 IsFN = 1064 N (up)?
