Selina solutions for Concise Physics [English] Class 7 ICSE chapter 2 - Motion [Latest edition]

Write true or false of the following statement.

Two trains going in opposite directions with the same speed are at rest relative to each other.

Write true or false of the following statement.

A ball is thrown vertically upwards. Its motion is uniform throughout.

Write true or false of the following statement.

The motion of a train starting from one station and reaching at another station is non-uniform.

Write true or false of the following statement.

A motion which repeats itself after a fixed interval of time is called periodic motion.

Write true or false of the following statement.

A ball thrown by a boy from a roof-top has oscillatory motion.

Write true or false of the following statement.

Mass has both magnitude and direction.

Write true or false of the following statement.

Weight always acts vertically downwards.

Write true or false of the following statement.

Mass varies from place to place but weight does not.

Fill in the blank:

Two boys cycling on the road with the same speed are _______ relative to each other.

Fill in the blank :

The motion in a ________ is rectilinear motion.

Fill in the blank:

One to and fro motion of a clock pendulum takes time = ________

Fill in the blank:

36 km h^-1 = ______

Fill in the blank:

Total distance travelled = _______ × total time taken.

Fill in the blank:

The weight of a girl is 36 kgf. Her mass will be _______

The weight of a body is measured using a _____________.

Match the following:

Select the correct alternative:

A book lying on a table is an example of

Select the correct alternative

The motion of a pendulum is

Select the correct alternative

A car moving on a straight road is an example of

 Select the correct alternative

A ball falls down vertically. Its motion is

Select the correct alternative

If a body covers equal distance in equal interval of time, the motion is said to be

A boy goes from his house to school by bus at a speed of 20 km h^-1 and returns back through the same route at a speed of 30 km h^-1. The average speed of his journey is ______.

Select the correct alternative

The earth attracts a body of mass 1 kg with a force of 10 N. The mass of a boy is 50 kg. His weight will be

Explain the meaning of the terms rest and motion.

Comment on the statement ‘rest and motion are relative terms’. Give an example.

Fill in the blank using one of the word: at rest, in motion.

A person walking in a compartment of a stationary train is relative to the compartment and is relative to the platform.

Fill in the blank using one of the word : at rest, in motion.

A person sitting in a compartment of a moving train is relative to the other person sitting by his side and is relative to the platform.

Name five different types of motion you know.

What do you mean by translatory motion ? Give one example.

Explain the meanings of rectilinear motion and Give one example.

Explain the meanings of curvilinear motion and Give one example. 

What is rotatory motion ? Give two examples.

What is meant by circular motion ? Give one example.

How does a rotatory motion differ from the circular motion?

Explain oscillatory motion by giving one example.

What is vibratory motion ? Give one example.

Differentiate between periodic and non-periodic motions by giving an example of each.

What is random motion? Give one example.

Name the type  of motion being performed by Vehicle on a straight road.

Name the type of motion being performed by Blades of an electric fan in motion.

Name the type of motion being performed by Pendulum of a wall clock.

Name the type of motion being performed by Smoke particles from chimney.

Name the type of motion being performed by Hands of a clock.

Name the type of motion being performed by Earth around the sun.

Name the type of motion being performed by A spinning top.

Give two examples to illustrate that a body can have two or more types of motion simultaneously.

State the types of motion of the needle of a sewing machine?

State the types of motion of the wheel of a bicycle ?

State the types of motion of the drill machine?

State the types of motion of the carpenter’s saw?

Distinguish between uniform and non-uniform motions, giving an example of each.

How do you determine the average speed of a body in non-uniform motion ?

Define the term weight and state its S.I. unit.

How are the units of weight, kgf and newton related ?

State three differences between mass and weight.

Which quantity : mass or weight, does not change by change of place ?

State which of the quantities, mass or weight is always directed vertically downwards.

A car covers a distance of 160 km between two cities in 4 h. What is the average speed of the car ?

A train travels a distance of 300 km with an average speed of 60 km h_1. How much time does it take to cover the distance?

A boy travels with an average speed of 10 m s^-1 for 20 min. How much distance does he travel?

A boy walks a distance 30 m in 1 minute and another 30 m in 1.5 minute. Describe the type of motion of the boy and find his average speed in m s-1.

A cyclist travels a distance of 1 km in the first hour, 0.5 km in the second hour and 0.3 km in the third hour. Find the average speed of the cyclist in (1) km h^-1, (2) m s^-1.

A car travels with speed 30 km h^-1 for 30 minute and then with speed 40 km h^-1 for one hour.

Find :
(a) the total distance travelled by the car
(b) the total time of travel, and
(c) the average speed of car

On earth the weight of a body of mass 1.0 kg is 10 N. What will be the weight of a boy of mass 37 kg in (a) kgf (b) N ?

The weight of a body of mass 6.0 kg on moon is 10 N. If a boy of mass 30 kg goes from earth to the moon surface, what will be his (a) mass, (b) weight ?