Question Pool Motion and Laws of Motion

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

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

Qn 1.

Write two examples of uniform circular motion

The movement of the tip of the second needle on the pendulum clock

movement of tip the leaf

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition

Qn 2.

When air exits a balloon filled with air, the balloon moves against the airflow. Explain its action and reactions?

If movement of air out of the balloon can be regarded as action, then movement of the balloon may be considered as

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition

Qn 3.

If a car with a 1000 kg mass and a bus with a mass of 2000 kg travel at the same speed, what momentum is greater? Why?

momentem is more for 2000kg bus. Mass and velocity are the factors that influence the momentum. if mass is more momentum is

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition

Qn 4.

A car traveling with an acceleration of 5 m/s2 starts moving from rest and travels 75 m by 25 s. Calculate final velocity of the car

v= u+at

= 0 + 5 x 25

=125

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition

Qn 5.

What is the magnitude of the momentum of a motorcycle of a mass of 100 kg at rest?What is its momentum if this motorcycle when it travels at 40 m / s?

p=mv

m=100 kg

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition

Qn 6.

Write the relation between mass and inertia of an object.

mass and inertia are directly

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition

Qn 7.

Classify the following instances into  inertia of motion and inertiaof rest.

1.When a running bus stops suddenly, passengers tend to fall forward

2. A fan rotates for a while even after it is switched off.

3.The mango falls down when braches are shaked.

4.it is possible to strike out a single carrom coin stacked one over the other without disturbing others

inertia of motion- statements 1,2

inertia of rest- statements

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition

Qn 8.

Find the first word pair relationship and complete the second word pair.

momentum; Kgm/s

Impulse:----------------

.Ns or

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition

Qn 9.

Write the reason

a) When the pole vault jumps, the impact is reduced by falling on the foamhead.

b) A cricketer lowers his hands while catching ball in order to increase time of catching.

.when time of collission increases force experienced

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition

Qn 10.

Pick out the correct one

The direction of acceleration of an object in uniform circular motion is---------------

a) Towards the centre of circular path

b) Away from the centre of circula path

c)Along tangent to the circular path

d) nor acceleration

a) Towards the centre of circular

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition

Qn 11.

The same amount of force is applied for 4s in an object with mass of 10 kg. Calculate the force applied if the velocity of the object increases from 6 m / s to 14 m / s.

F =m(v-u) /t

= 10 (14-6) /4

= 10 x 8

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition

Qn 12.

Write the reason

2. It is difficult to roll a filled tar barrel than an empty one..

a) Heavy objects are more inert. Heavy-duty vehicles moving along curved roads too quickly may cause accidents.
b) Because heavier

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition

Qn 13.

A car traveling at a speed of 90 Km (25 m / s) per hour, stops after 3 s when the brake is aplied. If mass of the car including passengers is 1200 kg, what is the force applied when the brake is operated?

F= m(v-u)/ t

= 1200(0- 25) / 3

=- -10000 N

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition

Qn 14.

Find out the reason

a. Standing passengers tend to fall forward when the running bus stops abruptly.

b. When the parked bus suddenly starts motion , the passengers fall backward.

a) inertia of motion

b) inertia of