Physics
Grade-10
Easy

Question

What is the centrifugal force acting when a ball is swirling around a point as it is tied to a rope. The radius of the circle formed is 20 cm. The mass of the ball is 300 gm. The speed of the rotation is 5 m/s.

  1. 37 N
  2. 37.5 N
  3. 38 N
  4. 38.5 N

hintHint:

F equals m v squared over r

The correct answer is: 37.5 N


    mass, m = 300gm = 0.3kg
    velocity, v = 5 m/s
    radius, r = 20cm = 0.20m
    centrifugal force,  F subscript c equals fraction numerator m v squared over denominator r end fraction
    Using the given formula,
    we will find the missing value,
    F subscript c equals fraction numerator 0.3 cross times left parenthesis 5 right parenthesis squared over denominator 0.20 end fraction
    equals fraction numerator 0.3 cross times 25 over denominator 0.20 end fraction
    equals 75 over 2 equals 37.5 space straight N

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