Biomedical Engineering Reference
In-Depth Information
Fig. 8.6
Experimental
arrangement used to
establish static equilibrium
in the conditions proposed
in this activity. A plank is
maintained in equilibrium,
placing it on the triangular
support base
M
1
M
2
d
1
d
2
M
1
¼
M
2
¼
4 marbles, for example;
M
1
¼
2
M
2
;
M
1
¼
3
M
2
;
and fill out Table
8.2
.
Table 8.2
Data obtained with the experimental setup used to establish
static equilibrium in the conditions proposed in this activity
Situation 1
F
1
(N)
d
1
(m)
F
2
(N)
d
2
(m)
F
1
d
1
(N m)
F
2
d
2
(N m)
Situation 2
F
1
(N)
d
1
(m)
F
2
(N)
d
2
(m)
F
1
d
1
(N m)
F
2
d
2
(N m)
Situation 3
F
1
(N)
d
1
(m)
F
2
(N)
d
2
(m)
F
1
d
1
(N m)
F
2
d
2
(N m)
If necessary, use a.u.f. in place of newton, N, for the unit of force
8.4.2.3 Static Equilibrium
1. The necessary conditions for static equilibrium of a rigid body were already
X
!
¼
¼
0, in translation and,
0, in rotation.
2. Verify, mathematically, if the conditions for equilibrium relative to rotation are
observed in each situation. For evaluation, consider the correct number of
significant digits in each measurement performed.
3. Determine the weight of the wooden bar, using the rubber band spring scale
constructed in Activity 1.
4. Apply the conditions for equilibrium relative to translation and determine the
magnitude of the support force (exerted by the triangular base on the wooden
bar) in each situation.
5. Justify the fact that the weight of wooden bar was not taken into account for the
verification of the rotational equilibrium conditions.
M
T
¼
∑
M
F
¼
