FORCES ACTING AT A POINT 39
- A space diagram of a force system is
shown in Figure 3.31. Which of the vec-
tor diagrams in Figure 3.32 does not rep-
resent this force system?
10 N
20 N
30 N
Figure 3.31
20 N
20 N
20 N 20 N
30 N
30 N
30 N 30 N
10 N
Not to scale
10 N
10 N
10 N
=Resultant
17.32 N
=Resultant
17.32 N
=Resultant
17.32 N Resultant
= 17.32 N
(d)
(c)
(a) (b)
Figure 3.32
- With reference to Figure 3.33, which of
the following statements is false?
FB= 20 N
FD= 8 N
FC= 5 N
FA= 10 N
150 °
60 °
30 °
Figure 3.33
(a) The horizontal component ofFAis
8.66 N
(b) The vertical component ofFB is
10 N
(c) The horizontal component of FC
is 0
(d) The vertical component ofFD is
4N
- The resultant of two forces of 3 N and
4 N can never be equal to:
(a) 2.5 N (b) 4.5 N (c) 6.5 N (d) 7.5 N
- The magnitude of the resultant of the
vectors shown in Figure 3.34 is:
(a) 5 N (b) 13 N (c) 1 N (d) 63 N
3 N
3 N 7 N
Figure 3.34
