# Formulas I have learned in my pre-AP physics class

1. Dec 7, 2004

### TriumphDog1

Here are all the formulas I have learned in my pre-AP physics class so far, I just finished the 1st semester:
They are in no particular order.

$$F_c = \frac {mv^2}{r}$$

$$a_c = \frac {v^2}{r}$$

$$F_F = \mu * F_N$$

$$C = 2 * \pi * r$$

$$V_f = V_i + at$$

$$V_f^2 = V_i^2 + 2ad$$

$$d = V_i * t + \frac {1}{2} * at^2$$

$$d = \frac {1}{2} (V_f + V_i) * t$$

$$v = \frac {d}{t}$$

$$F = ma$$

$$F = \frac {G * m_1 * m_2}{r^2}$$

$$g = \mu * a$$

$$g = \frac {Gm}{r^2}$$

$$v_o = \sqrt {\frac {Gm}{r}}$$

$$P.E. = mgh$$

$$W = Fd$$

$$K.E. = \frac {1}{2} * mv^2$$

KEY
$$F_c$$ = centripital force
$$a_c$$ = centripital acceleration
m = mass
v = velocity
$$F_F$$ = frictional force
$$F_N$$ = normal force(weight)
$$\mu$$ = coefficient of friction
C = circumference
$$V_f$$ = final velocity
$$V_i$$ = initial velocity
a = acceleration
d = distance
g = acceleration due to gravity
t = time
G = gravitational constant
P.E. = potential energy
K.E. = kinetic energy
W = work

some important values:
mass of the earth = $$5.98 * 10^24 kg$$
radius of the earth = $$6.38 * 10^6 km$$
radius of the moon = $$1.74 * 10^3 km$$
mass of the moon = $$7.35 * 10^35 kg$$
gravitational constant = $$6.67 * 10^-11 \frac {N*m^2}{kg^2}$$

Feel free to add anything or make suggestions. I will add more as the year goes on. I hope this helps some of you.

Last edited: Dec 7, 2004
2. Dec 7, 2004

### Nylex

You mean gravitational constant.

3. Dec 7, 2004

### dextercioby

The gravitational constant a.k.a. Cavendish's constant IS THE GRAVITATIONAL FORCE WITH WHICH 2 BODIES OF 1Kg EACH SITUATED AT A DISTANCE OF OF 1m ATTRACT EACH OTHER.

That's how those words got there instead of "gravitational/Cavendish's constant".Via a simple dictionary-type definition.Unfortunately,it weren't all,just the first 2 which would lead to an erroneous statement.

Congratulations,Nylex!!Apparently statistical mechanics and Cavendish's constant have nothing in common,or do they...??I'll let u think about it.

PS Sorry for being cynical.

4. Dec 7, 2004

### TriumphDog1

there i fixed it

5. Dec 7, 2004

### Skomatth

This could be helpful as a sticky, I see so many people stuck just because they don't know a formula (especially basic kinematic ones !). If it's online, a link to the AP B and C formula sheets would be helpful too, as it is basically what Triumph posted.

6. Dec 7, 2004

### TriumphDog1

i did a quick google search and found this

7. Dec 8, 2004

### TriumphDog1

if this doesnt get stickied, nobody's even gonna see it with many new threads being created every day

8. Dec 8, 2004

### prasanna

$$v_e = \sqrt{\frac{2GM}{R}}$$

$$v_e$$ is the escape velocity

Last edited: Dec 8, 2004