Things to Memorize for the AP Physics 1 Exam

Weight (W)

mg (mass x gravity)

Another name for weight

Fg

the equation for the vector sum of two vectors

√(x²+y²)

the equation for the angle of two vectors

tan⁻¹(y/x)

Whenever something changes direction, at one point velocity must hit ...

0

Slope of position graph gives ...

velocity

Slope of velocity graph gives ...

acceleration

Area under velocity graph gives ...

position

Area under acceleration gives ...

velocity

The acceleration of a projectile in the y = ___ and in the x = ___

-9.8; 0

when projectiles are at the peak, Y Velocity is ___, X is ____

0; still what it started as

Projectiles in a horizontal cliff problem, Vy initial = ___, Vx is ___

0; all of the velocity

Fgpara = ...

mgsinӨ

Fgperp = ...

mgcosӨ

Fn and Fg_per

mgcosӨ

Friction =

μFN; μcosθ

Friction is not always ___, but it is always ___

μmg; μFN

Fcentripetal = ...

mv²/r

V = ...

2πr/T (ONLY IF SPEED IS CONSTANT)

G-force =

Fn/Fg

Force centripetal ALWAYS goes toward the ...

center

Acceleration due to gravity on a planet: g = ...

GM/r²

Energy: Ask 4 questions ...

is it moving?, does it have height?, is it on a spring?, is it spinning?

The equations for energy are ...

½mv², ½kx², ½ I⍵², mgh

Mechanical energy is ___ energy

useable

Perfectly elastic collision means ...

no energy is lost

inelastic means collision...

energy is lost

Any collision has to be analyzed using momentum, anything before or after the collision can use ___

energy

4 momentum equations

Imp=Ft=mΔv= change in momentum

Area under a Force vs Time graph is ...

impulse

Area under a Force vs Distance graph is ...

work

Radians to Revolutions to Degrees conversions

2π radians = 1 revolution = 360°

The rotational version of F=ma

τ=I𝛼

With statics (not moving) put the axis of rotation over ... force so ...

an unknown; that it is ZERO in your equation.

In rotational dynamics, Always solve for component of the ... to the lever arm, before using it as a ...

force perpendicular; torque

(in rotational energy) a =

αr

(in rotational energy) v =

⍵r

When something is spinning it has ...

½I⍵²

τθ =

½I⍵²

L =

I⍵

Relating linear and angular momentum: use ...

mvR

Area under a Torque vs Time graph is ...

Angular Impulse

Period of a Pendulum

Tp = 2π√(l/g)

Period of a Spring

Ts=2π√(m/k)

Period of pendulum only depends on the variables __ and __

g; L

Period of spring only depends on the variables __ and __

k; m

Period (SHM)

the time it takes the object to complete one oscillation and return to the starting position

Frequency (SHM)

The number of cycles completed by oscillating particles in one second (f=1/T)