ZAD.1.
F_1 = 10 N = 10 \frac{kg*m}{s^2}
m_1 = 20 kg
m_2 = 10 kg +20 kg=30 kg
F_2 = ?
1.obliczam przyspieszenie a = \frac{F_1}{m_1}
a = 10 \frac{kg*m/s^2}{20 kg}
a = 0,5 m/s^2
2.obliczam F_2
F_2 = m_2 *a
F_2 = 30 kg*0,5 m/s^2
F_2 = 15 N
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ZAD.2.
m = 800 kg
t = 20 s
V = 20 m/s
F = ?
F = ma
a = V/t
F = mV/t
F = 800 kg20 m/s/20 s
F = 800 N
zad.3
F1 = 10 N
F2 = 20 N
Fw= ?
Fw = 20 N- 10 N
Fw = 10 N
jeżeli siły mają ten sam kierunek ale przeciwne zwroty to odejmujemy
zad.5.
m = 10 kg
gz= 10 m/s^2
gk = 1/6 gz = 10/6 m/s^2
Fz=?
Fk = ?
F = mg
Fz = 10 kg 10 m/s^2 = 100 N
Fk = 10 kg 10/6 m/s^2
Fk = 16,6 N
zad.6
m = 2 kg
F = 400 N
g = ?
F = mg
g = F/m
g = 400 N/2 kg
g = 200 m/s^2
[N] = [kgm/s^2]