Quiz ( 1 )
Grade/Cluster
11 Core
Subject
Section
Name
Physics
Date
AK
Score/20
ID
( I ) Choose the correct answer :
(4 marks )
1.The horizontal acceleration of a projectile after it is fired is ………..
a. dependent on the vertical acceleration
b. directly proportional to acceleration due to gravity
c. constant
d. zero
2. Neglecting air resistance, the initial horizontal velocity of a projectile is …….its final
horizontal velocity.
a. greater than
c. equal to
b. less than
d. directly proportional to
( Q3 and Q4 ), a projectile is launched at an angle from the level ground. Assume air
resistance is negligible.
3.Which of the following choices is NOT constant throughout the flight of the
projectile?
A.
Horizontal velocity
B.
vertical velocity
C.
horizontal acceleration
D.
vertical acceleration
4.Which of the below choices is zero throughout the flight of the projectile?
A.
horizontal velocity
B.
vertical velocity
C.
horizontal acceleration
D.
vertical acceleration
Quiz
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( II ) Solve the following problems :
(12 marks, 2 for each part )
5.A remote-control car with a constant velocity drives off the top of a wall that is 10.0 m
high and lands 4.60 m from the base of the wall.
a. What is the car’s velocity before it drives off the top of the wall?
b. What is the car’s vertical velocity at impact?
OR
Vf = Vi + at
= 0 + 9.8x1.43
= 3.22 m/s
c. How far from the base of the wall would the remote-control car have landed if it had
been subject to acceleration due to gravity on the Moon (1.7 m/s2)?
Quiz
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6.A punter kicks a football at an angle of 45° to the ground. The football has an initial
velocity of 25 m/s.
a. How long is the football in the air?
Vfy = Viy + gt
0 = 25sin45 – 9.8 x t
t = 1.8 s
Total t = 1.8 x 2 = 3.6 s
b. How far does the football travel horizontally?
= 252 sin(2x45) / 9.8 = 63.8 m
c. What is the maximum height of the football?
= 252 (sin45)2 / 2x9.8= 15.9 m
( III ) Answer the following questions :
(4 marks )
8.What is meant by trajectory?
a projectile’s path through space ignoring air resistance.
8.Do the horizontal and vertical components of a projectile depend on each other?
Explain.
The horizontal and vertical components do not depend on each other in the absence of
air resistance as each experience different types of motion.
Quiz
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