JAMB Physics 2011 Paper

Concept:Centripetal force is the inward force that keeps an object moving along a circular path.Explanation:Start by writing down the given values:Mass, $m = 2\ \mathrm{kg}$Velocity, $v = 10\ \mathrm{ms^{-1}}$Radius, $r = 4\ \mathrm{m}$The formula for centripetal force is:$$F = \frac{mv^2}{r}$$Now substitute the given values into the formula:$$F = \frac{2 \times (10)^2}{4}$$$$F = \frac{2 \times 100}{4}$$$$F = \frac{200}{4}$$$$F = 50\ \mathrm{N}$$This shows that the force required to keep the object moving in the circle is $50\ \mathrm{N}$.Answer:The centripetal force on the object is $50\ \mathrm{N}$.