Question

A boy is swinging a yo-yo with mass 0.25 kg in a circle with radius 1 m at a speed of 6 m/s. What is the tension in the string connecting the yo-yo to the boy's finger, disregarding the effect of gravity?

A. 20N
B. 12N
C. 35N
D. 9N

Answer 1

D. 9 N

Step-by-step explanation:

The tension on the string is equivalent to the centripetal force.

Centripetal force is the force exerted by an object in circular motion or path towards the center of the circular path.

Centripetal force = mv²/r

where m is the mass of the object, v is the velocity and r is the radius of the circular path.

Centripetal force = (0.25 kg × 6²)/ 1

= 9 N

Thus, the tension on the string is 9 N