# Example 4-2
m1 = 1000 kg
a1 = 0.5 * grav();
f1 = m1 * a1; N
m2 = 200 g
a2 = a1
f2 = m2 * a2; N

# Example 4-3
v0 = 100 kph
v = 0 kph
del_x = 55 m
a = (v^2 - v0^2) / 2 / del_x
m1 = 1500 kg
f = m1 * a; N

# Example 4-6
MKS(N)
m1 = 10 kg
f1 = m1 * grav()
f2 = 40 N
f3 = f1 + f2
f4 = f1 - f2

# Example 4-7
fp = 100 N
m1 = 10 kg
f1  = m1 * grav()
fy = fp - f1
ay = fy / m1

# Example 4-8
m1 = 65 kg
f1 = m1 * grav()
a2 = 0.2 * grav()
f2 = m1 * a2
fn = f1 - f2
m2 = fn / grav()

# Example 4-9
MKS(N, deg)
fa = PolarVec(40 N, 45 deg)
fb = PolarVec(30 N, -37 deg)
fr = fa + fb
mag(fr)
PolarAngle(fr)

# Example 4-11
MKS(N, deg)
fp = PolarVec(40 N, 30 deg)
fpx = component(fp,1)
fpy = component(fp,2)
m1 = 10 kg
fg = m1 * grav()
ax = fpx / m1
fn = fg - fpy

# Example 4-12
MKS(N, deg)
ma = 12 kg
mb = 10 kg
fp = 40 N
a = fp / (ma + mb)

# Example 4-13
mc = 1000 kg
me = 1150 kg
a = grav() * (me - mc)  / (me + mc)
Ft = me * (grav() - a); N

# Example 4-15
a = 1.2 m / s^2
q = atan(a / grav());deg

# Example 4-16
MKS(N)
q = 30 deg
m1 = 10 kg
a = grav() * sin(q)
fn = cos(q) * m1 * grav()

# Homework Problems:

TBD