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Physics Form 4 Chapter 2 Force and Motion I
15. Which of the following The rocket moves upwards. 21. Figure 21 shows a graph of
physical quantities will What concept can be used to velocity against time for an
change when an object is explain this situation? aeroplane.
brought from Earth to the A Inertia V
Moon? B Impulse
A Mass C Newton’s second law B C
B Weight D Newton’s Third Law
C Inertia D
D Length 20. A E
t
16. What will happen when
forces acting on a plane are Tomato Figure 21
in equilibrium? Which part of the graph
A The plane will accelerate. Concrete shows that the forces
B The plane will decelerate. Tomato breaks floor acting on the plane are in
C The plane moves with equilibrium?
Chapter
uniform velocity. A AB
2 D The plane will change its B BC
height. C CD
D DE
17. A boy with a mass of 30 kg
runs at a velocity of 6 m s . 22. Which is the unit for impulse?
–1
He jumps on a stationary A kg m s
–2
trolley with a mass of 15 kg. B kg m s –2
2
Both the boy and the trolley C kg m s
2
–1
move together in the original Tomato D kg m s –1
direction of the boy’s motion.
What is the velocity of the 23. Figure 22 shows a ball rolling
boy and trolley? Tomato does not break Sponge down a smooth slope and
A 3.0 m s continues to move on a
–1
–1
B 4.0 m s rough horizontal surface.
C 6.0 m s –1
D 8.0 m s –1
18. A cannon ball with a mass of Figure 20 Smooth slope
20 kg is fired from a cannon
with a mass of 400 kg. If the Figure 20 shows two identical Rough surface
cannon ball moves with a tomatoes dropped from the Figure 22
velocity of 120 m s , what is same height onto a concrete
–1
the magnitude of the recoil floor and a piece of sponge Which of the following
velocity of the cannon? respectively. Which inference velocity-time graphs best
A 0.3 m s –1 C 3.0 m s –1 is correct? explains the motion of the
B 2.0 m s D 6.0 m s –1 A The impulsive force ball?
–1
depends on the velocity A v
19. Figure 19 shows a water
rocket with water gushing out of the tomato.
from its lower end. B The impulsive force
depends on the impact
time.
Water
rocket C The impulsive force t
Movement depends on the B v
gravitational potential
energy.
D The impulsive force
depends on the height at
Water the tomato falls.
t
Figure 19

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