1. until an unbalanced force acts on it!!1)
It stays there
forever
until an unbalanced force acts on it!!
Weight (Fg)
down
Table (FN) up FN NO Fg 2)
It accelerates
in the direction of the push
Weight (Fg)
down FN f
Table (FN) up
opposite the direction it moves
Friction (f) Fg
Yes
Friction slows the ball until is stops

2. ΣF = 0 3)
means the sum of the forces equals zero
(the net force is zero) NO
It means the object cannot be accelerating
(it could be moving, but if it is moving, it’s
moving with constant velocity)
ΣF = ma 4)
acceleration is directly proportional
to the net applied force
acceleration direction is in the direction
of the net applied force 5)
Given:
Fg = 485 N
g = 9.8 m/s2
Fg = mg
m = 49.5 kg
485 = m(9.8)
m =49,500 g
Fg = (49,500)(980)
Fg = 4.85 x 107 dynes

3. Fengine = 4800 Newtons Given: m = 1200 kg g = 9.8 m/s2 Fg = 11,760 N6)
Given:
m = 1200 kg
g = 9.8 m/s2
Fg = 11,760 N
a = 4.0 m/s2 FN
Fengine
F = Fengine
F = ma
ma = Fengine
(1200) (4) = Fengine Fg a
Fengine = 4800 Newtons

4. a = 3.75 m/s2 Given: m = 400 kg g = 9.8 m/s2 Fg = 3920 N7)
Given:
m = 400 kg
g = 9.8 m/s2
Fg = 3920 N
Fengine = 2250 N
f = 750 N FN
Fengine f
F = Fengine - f
F = ma
ma = Fengine - f
(400) (a) = Fg a
a = 3.75 m/s2

5. Given: m = 6.0 kg g = 9.8 m/s2 Fg = 58.8 N (a) (b) FT FT a a = 0 Fg Fg8)
(a)
(b)
Fg = 58.8 N FT FT a
a = 0 Fg Fg
(c)
(d) FT FT a a Fg Fg

6. FT= 58.8 N FT = 24.6 N FT = 81.0 N FT = 0.0 N F = FT - Fg F = ma
ma = FT - Fg
(6) (0) = FT
F = Fg- FT
F = ma
ma = Fg - FT
(6) (5.7) = FT
(a)
(b)
FT= 58.8 N
FT = 24.6 N
F = FT - Fg
F = ma
ma = FT - Fg
(6) (3.7) = FT
F = Fg- FT
F = ma
ma = Fg - FT
(6) (9.8) = FT
(d)
(c)
FT = 81.0 N
FT = 0.0 N

7. ΣF = 82.65 N Fg = mg 7.35 = m(9.8) a = 110 m/s2 mAgena = 3292 kg
Given:
Fupward = 90 N
Fg = 7.35 N 9)
Fupward a Fg
(a)
Fg = mg
7.35 = m(9.8)
m = kg (750 grams)
(b)
F = Fupward - Fg
F = 90 – 7.35
ΣF = N
F = ma
82.65 = (0.75) (a)
(c)
a = 110 m/s2
F = Faverage
F = ma
mAgena = 3292 kg
890 = m (0.133)
Given:
Faverage = 890 N
a = m/s2
10)
this is the mass of
both spacecraft
so . . .
m = 6692 kg