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Intro to Torque

a yo yo has a...

Question

a yo yo has aspool of mass m and radius R. a massless string is wound around an axle of radius b and of negligible mass.if the yo yo released from rest has a downward acceleration of g/9 what is the ratio of R/b?

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Q. A Yo-Yo of mass

m

has an axle of radius

b

and a spool of radius

R

. The Yo-Yo is placed upright on a table and string is pulled with a horizontal force

\to F

to the right as shown in the figure.

The static friction coefficient between the Yo-Yo and the table is

μ_{s}

. Now there are two cases
Case (a): The string is pulled very gently.
Case (b): The string is pulled with a jerk.
The Yo- Yo will rotate

A yo-yo has mass

m

r

, and outer radius

R

. Its moment of inertia is

I

about its center. The yo-yo rolls without slipping on a horizontal table, and is pulled along by a horizontal string wound around its inner radius. The pulling by the string with tension

T

gives rise to an acceleration

a

. The yo-yo rolls without slipping.

What is the magnitude of acceleration a ?

Q. A Yo-Yo of mass

m

has an axle of radius

b

and a spool of radius

R

. The Yo-Yo is placed upright on a table and string is pulled with a horizontal force

\to F

to the right as shown in the figure.

The static friction coefficient between the Yo-Yo and the table is

μ_{s}

. Now there are two cases
Case (a): The string is pulled very gently.
Case (b): The string is pulled with a jerk.
The Yo- Yo will rotate

Q. A yo-yo has mass

m

r

, and outer radius

R

. Its moment of inertia is

I

about its center. The yo-yo rolls without slipping on a horizontal table, and is pulled along by a horizontal string wound around its inner radius. The pulling by the string with tension

T

gives rise to an acceleration

a

. The yo-yo rolls without slipping. Find the force of friction

f

, in terms of tension

T

.

Q. A yo-yo is relased from your hand with the string wrapped around your finger. If you hold your hand still, the acceleration of the yo-yo is :

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