Question

Consider the ball being swung around in a circle on the end of a string at 1.03 revolutions per second. a. How much force is required to keep it moving in a circle at 3 revolutions per second if the string has a radius of 0.34 m, and the mass of the ball is 0.26 kg

Answer 1

The force required to keep the ball moving in the circular path is 1.664 N.

We know that the centripetal acceleration is given by;

ac=rω2

r =  0.34 m

ω = 3 revolutions per second

If 1 rev/s = 2π rad/s

3 rev/s = 3 rev/s × 2π rad/s/ 1 rev/s = 6π rad/s

ac= 0.34 m × 6π rad/s

ac = 6.4 ms^2

To find the force;

F = mac

m = 0.26 kg

F = 0.26 kg ×  6.4 ms^2

F = 1.664 N

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