Page 15 - Physics Form 5 KSSM_Neat
P. 15
Situation 3: Two forces acting on an object perpendicular to each other CHAPTER 1
Method and sample calculation
Consider the two (i) Complete the diagram (i) Force and Motion II
forces as the sides with the sides representing
of a rectangle. the two forces that are 6 N
KEMENTERIAN PENDIDIKAN MALAYSIA
perpendicular to each
other.
6 N (ii) Draw the diagonal of the 8 N
rectangle that represents
the resultant force, F of the
two forces. (ii)
8 N (iii) Calculate the length of the 6 N F
diagonal using Pythagoras’
Theorem.
(iv) Calculate the angle
between the diagonal and 8 N
one of the sides of the
rectangle. (iii)
F
6
θ
8
Info GALLERY
2
F = 6 + 8 2
The resultant force can also
be determined by drawing a F = 10 N
scaled diagram.
10 N
θ
6
(iv) tan q =
8
= 0.75
–1
q = tan (0.75)
= 36.9°
10 N
36.9°
LS 1.1.2 5
