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)?