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Force-Vector Diagrams
In each case, a rock is acted on by one or more forces. Draw an accurate vector diagram show­
all forces acting on the rock, and no other forces. Use a ruler, and do it in pencil so you can
correct mistakes. The first two are done as examples. Show by the parallelogram rule in 2 that
the vector sum of A + B is equal and opposite to W (that is, A + B -W). Do the same for 3 and 4.
Draw and label vectors for the weight and normal forces in 5 to 10, and for the appropriate
forces in 11 and 12.
m~
=
1. Static
2. Static
3. Static
6. Sliding at
constant speed
without frictio
4. Static
5. Static
7. Decelerating
due to friction
8. Static (Friction
prevents sliding)
9. Rock slides
(No friction)
11. Rock in free fall
12. Falling at
terminal
veloCity
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tncnx to
Jim Court
/
18. TJed to.J rope .Jnd pulled so that the rock moves
horizont.Jlly .Jt mnstant velocity. Note: 11Iere must be
air friction in this case,
20 Swinging en a rope. at lowest position.
No friction.
.......... ......
..'"
cons"nt
.1:
str.Ii~t d~ward.
Tied to a rope
pulled
Ao::elerating downward at 19.6 m/Sl. No friction.
I I 17.
I
.... ..
. ~!a
i
~
y
~ lS, Swinging en a rope. at the top
oi. vertical circle,
~
'1~ L===
l~l~T-+-_ _ __
14. Rising in a parabolic: tnjeetury.
. 19. TIed to a rope aNi pulled so that the rod;
accelerates horizontally .Jt 2g. No air. friction
,,
,--........
, ,
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I
1!. At the tap of a puUctic tIaje uy.
,,
,
,
,
I
,,
I
,,
I
,
16. Tied to a lOpe and pulled sbaigbt upward.
ActzIentinlJ upward at '.laa/sl.
'. t:
No . . ,..
............. .
.
". ..'F""
--
I
I
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