8/17/2019 Hierrezuelo PhysEd 95 Article

1/6

Sliding

a

rollin

J

Hierrezuel

Mdaga),

Sp

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NEW A P P ROACH E S

shown

in

figure 1,

In

this stage the sphe

slips a t th e same time.

The

dynamic equ

describe this situation are

XF

=

Ma, =Ma

Z T / cy fr =

/

a

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of students errors, and therefore it

clear that, although there

is

a conne

translation and rotation, v,

rw

because

of

sliding.

From equations

6)

and (7) it can be

while the sphere is acquiring angular s

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NEW APPROACHE S

usually many times smaller than the slid

therefore balls and rollers are widely us

technical applications to reduce the fricti

surfaces.

Rigid rolling body moving freely on a

horizontal surface. This

is

the case of

a

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N E W

AP PROACHE S

Salazar A, SBnchez-Lavega A and Aman

1990

Is

the frictional force always oppo

motion? Phys.

Fduc

25 82-5

Shaw D 1979 Frictional force

on

rolling

J. P h F .

47

887-8