Question Pool Equation of Motion

# Equation of Motion - SAMAGRA Question Pool & Answers | Class 9 English Medium

Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 9 English Medium Physics Equation of Motion

Qn 1.

An object is starting from rest and moving with an acceleration of 2 m/s2. What will be its velocity after 10 second?

20

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Qn 2.

An arecanut took one second to reach the ground from the tree . Then what will be the approximate height of the arecanut tree?

( 20, 5, 12, 8)

5

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Qn 3.

X and Y are the liquids taken in a beaker. If Y is water, then what will be the relative density of X

( 1, Less than 1, greater than 1, zero)

Less than

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Qn 4.

Write the name of the appliance which works by the principle of Pascal’s Law

( Hydrometer, Thermometer, Lactometer, Hydraulic Jack)

Hydraulic

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Qn 5.

A car which was moving with 20m/s velocity came to rest in 5 s by applying brakes. Calculate it's acceleration.

u=20m/s , v= 0 m/s, t= 5 s

a= v-u/t

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Qn 6.

A body starts from rest, moves with uniform acceleration 2 m/s2. Calculate it's velocity when it travels 25 m.

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Qn 7.

A stone thrown upwards with an initial velocity of 29.4 m/s reaches the maximum height and then falls down. (take g = 9.8 m/s2 )

a) What is the velocity of the stone at the maximum height?

b) Write down whether the stone has attained acceleration or deceleration on moving up.

1. Calculate the time taken by the stone to reach the maximum height.

2. Which among the following depicts the correct speed-time graph of the motion of the stone ?

IMAGE

a) zero (0 m/s)

b) deceleration -9.8 m/s2

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Qn 8.

A slanting line was obtained on plotting the displacement – time graph of an object. The object is in ............................ motion.

( at rest, non-uniform speed, uniform speed, uniform acceleration)

uniform

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Qn 9.

Calculate the momentum of an object of mass 10 Kg moving at a velocity of 2 m/s.

p= mv=10x2= 20

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Qn 10.

A car travelling at a speed of 90 Km per hour (25 m/s), applies brake and comes to rest in 3 s. If the mass of the car including passengers is 1200 Kg, calculate the force applied on the brake.

F= m(v-u)/ t

= 1200(0- 25) / 3

=- -10000 N

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Qn 11.

Starting from rest, a car travels with a uniform acceleration of 5 m/s2.
a) Calculate it's velocity after 20 s.
b) In this time,
how much will be it's displacement?

a=5m/s2

t=25 s

d=75 m, u=0

v=?, v=u+at

=0+5 x 25 = 125

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Qn 12.

An aeroplane after landing to the run-way with a speed of 36 Km/h travels in straight line for 5 s and comes to rest.

1. Calculate the deceleration of the aeroplane.

2. Calculate the distance travelled by the aeroplane through the run-way.

1. v = u + at

0 = 10 + a X 300

a