Answer:
point A N = 11172 N
, point B N = 13486 N and point C N = 14801 N
Explanation:
Let's use Newton's second law on the Y axis, where the car is in equilibrium
a) Horizontal and flat road
Point A
N -w = 0
N = W = mg
N = 1140 9.18
N = 11172 N
b) Horizontal and curved road
In this case, when applying Newton's second law, we have centripetal acceleration, due to the curve
N -W = m a
a = v² / R
N = mg + m v² / R
N = m (g + v² / R)
Point B
Rb = 160 m
We reduce the speed to SI units
V = 71.8 km / h (1000m / 1km) (1h / 3600s) = 19.95 m / s
N = 1140 (9.8 + 19.95²/160)
N = 1140 11.83
N = 13486 N
B point
Rb = 125 m
N = 1140 (9.8 + 19.95²/125)
N = 1140 (12.98)
N = 14801 N
the curve is assumed 90º