Page 16 - Q & A STPM 2022 Physics

Physics Semester 1 STPM Chapter 1 Physical Quantities and Units
Answer: D
N
v
16 m s –1 16 m s –1

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–u u –1 12 m s –1
v – u 12 m s v
Common Error

Many students could not be Semester
2
2
(∆V) = 12 + 16 2 tan θ = 16 able to draw the direction of
–1
∆V = 20 m s 12 DV correctly.
θ = 53.1° 1
–1
∴ Change of velocity of the car is 20 m s S 53°W
Question 3

The diagram shows a horizontal force F pushing a block up an inclined plane.
F


If the weight of the block is W, what is the nett force acting on the block parallel
to the inclined plane?
A F cos θ C F cos θ – W sin θ
B W sin θ D F sin θ + W cos θ

Exam Tips
Answer: C Exam Tips
F cos 


F W sin 
F sin   F sin  F

W cos 
W

Nett force acting on the block parallel to F cos 
the inclined plane F can be resolved into two
= F cos θ – W sin θ components. F cos θ is
the horizontal component
and F sin θ is the vertical
component.

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