1. A car rounding a banked curve. What is an angle for the road which has a curve of radius 60 meters with a design speed of 20 m/ s? Assume there is no geseran between car and road.
Penyelesaian
N= daya biasa
N sin θ = horizontal component of the normal force
N cos θ = vertical component of the normal force
w = m g = the berat kereta itu
The road is designed to be banked to eliminate dependence on friction.
The net horizontal force, the horizontal component of the normal force (N sin θ), required to keep the car moving in a circle around the curve.
We choose x-axis as horizontal and y-axis as vertical, so that centripetal acceleration, aR, is along the horizontal direction. In the horizontal direction, the only force is the horizontal component of the normal force (N sin θ), needed to produce the pecutan memusat. N sin θ = daya sentripetal.
Apply Newton’s law of motion in the vertical direction :
Apply Newton’s law of motion in the horizontal direction :
Penggantiting N in equation 1 into N in equation 2 :
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- Jisim dan berat
- Daya biasa
- Hukum kedua Newton tentang gerakan
- Daya geseran
- Gerakan pada permukaan mendatar tanpa daya geseran
- Gerakan dua jasad dengan pecutan yang sama pada permukaan mendatar kasar dengan daya geseran
- Gerakan pada satah condong tanpa daya geseran
- Gerakan pada satah condong kasar dengan daya geseran
- Gerakan dalam lif
- Pergerakan jasad dihubungkan oleh tali dan takal
- Dua jasad dengan magnitud pecutan yang sama
- Membulatkan lengkungan rata – dinamik gerakan membulat
- Membulatkan lengkung miring – dinamik gerakan membulat
- Gerakan seragam dalam bulatan mendatar
- Daya memusat dalam gerakan membulat seragam
