Aptitude Test Problems in Physics Science for Everyone by S Krotov ( PDFDrive.com )

Fig. 150

Solutions^143

The distances traversed by the block in uni-

formly varying motion at the initial velocity v

before it stops can be written in the form

1 '

V2^ V 2 7 V 2

1 2 =

2a

6=

2a2 2 2a

Taking into account the relations for the accelera-

tions al , a 2 , and a, we can find the distance I tra-

versed by the block along the horizontal guide:

(^21112)
I-1
1± 1 2 •
1.43. We shall write the equations of motion for
the block in terms of projections on the axis direct-
Fig. 151
ed downwards along the inclined plane. For the
upward motion of the block, we take into account
all the forces acting on it: the force of gravity mg,
the normal reaction N, and friction Ftr (Fig. 151),