Page 14 - Physics Form 5 KSSM_Neat

Determining a Resultant Force
A resultant force is the vector sum of the forces acting on a point. How do we determine the
resultant force of two forces acting on a point?

Activity 1.2 Pattern Recognition

KEMENTERIAN PENDIDIKAN MALAYSIA
Aim: To determine the resultant force produced when two forces are acting on an object on a plane
Instructions:
1. Carry out a Think-Pair-Share activity.
2. Observe the four situations that involve two forces acting on a point.
SCAN ME
SCAN ME
3. Examine the suggested method and the sample calculation. Worksheet
4. Scan the QR code and print the worksheet. Calculate the Activity 1.2
resultant force for each situation.
https://bit.ly/32ijdmS
Situation 1: Two forces acting on an object in the same direction
Method and sample calculation

6 N 8 N (i) The magnitude of the resultant Assume that the force to the
force is equal to the sum of the right is positive:
two forces. (i) Magnitude of the
(ii) The direction of the resultant resultant force,
force is the same as the F = 6 + 8
direction of the two forces. = 14 N
(iii) The resultant force is stated by (ii) Direction of the resultant
its magnitude and direction. force is to the right
(iii) Resultant force,
F = 14 N to the right
14 N

Situation 2: Two forces acting on an object in the opposite directions
Method and sample calculation

8 N 6 N (i) The magnitude of the resultant (i) Assume that the force to
force is obtained from the the right is positive:
vector sum of the two forces. Resultant force,
(ii) The direction of the resultant F = –8 + 6
force is in the direction of = –2 N
the force with the larger Magnitude of the
magnitude. resultant force = 2 N
(iii) The resultant force is stated by (ii) Direction of the resultant
its magnitude and direction. force is to the left
(iii) Resultant force,
F = 2 N to the left or
F = –2N
2 N

4 LS 1.1.2