Short Questions

Question 1

What is Uniform circular motion

Answer 1

Uniform circular motion is the motion in which an object moves on a circular path with constant speed. For example: watch, moon revolve
around earth etc

Question 2

What is Non uniform circular motion

Answer 2

Non uniform circular motion is the motion in which an object is moves on circular path with varying speed. When an object is in circular
motion, direction of its velocity keeps on changing.

Question 3

What do you mean by motion?

Answer 3

Motion is the change in the position of object over time

Question 4

Define origin?

Answer 4

The position of an object we need to specify at the reference point is called the origin.

Question 5

Which is the simplest type of motion?

Answer 5

The simplest type of motion is the motion along a straight line

Question 6

What is magnitude?

Answer 6

The numerical value of a physical quantity is called a magnitude.

Question 7

Define displacement?

Answer 7

The shortest distance measured from the initial to the final position of an object is called displacement.

Question 8

What is an odometer?

Answer 8

Automobiles are fitted with a device that shows a distance travelled that device is called an odometer.

Question 9

How can we change the velocity of an object?

Answer 9

The velocity of an object changes from an initial value to the final value in time the acceleration is a= v – u / t.

Question 10

What is the SI unit of the acceleration?

Answer 10

The SI unit of the acceleration is m/s -2

Question 11

What are the two graphical representation of motion?

Answer 11

Distance- time graphs and Velocity-time graphs are the two graphical representation of motion.

Question 12

What is acceleration?

Answer 12

The acceleration of an object is the change in velocity per unit time.

Question 13

A car covers a distance x, while moving at 50km/h in 10 seconds, find the value of x.

Question 14

Risha is travelling by a train which is moving with a constant velocity of 100km/h. how much distance will it cover in 20s?

Question 15

When is a body said to have uniform velocity?

Question 16

Give an example of non- uniform acceleration. What all ways the velocity of the body can be changed?

Question 17

What is the use of distance -time graph?

Answer 17

The speed of the body can be known from distance -time graph

Question 18

When is the acceleration taken as negative?

Answer 18

Acceleration is taken as negative if direction of motion is opposite to the direction of velocity.

Question 19

What are Scalar and Vector Quantities?

Answer 19

: A scalar quantity describes a magnitude or a numerical value.A vector quantity describes the magnitude as well as the direction

Question 20

What is non-uniform motion?

Answer 20

: When an object travels unequal distances in equal intervals of time the object is said to have a non-uniform motion

Question 21

Can a body have constant speed but variable velocity?

Answer 21

Yes, when the body is in uniform circular motion it has constant speed but due to the change in the direction of motion, its velocity
changes at every point.

Question 22

In a distance -time graph which physical quantity is taken on the x-axis?

Answer 22

Time is taken on the x-axis and distance on the y-axis.

Question 23

What indicates the motion of the earth?

Answer 23

The phenomena like day and night indicates the motion of the earth

Question 24

Give an example of circular motion.

Answer 24

Motion of an artificial satellite around the earth.

Question 25

An object moves with uniform positive acceleration. What will be its velocity -time graph?

Answer 25

: A straight line inclined at an acute angle to the time axis.

Question 26

What is essential to describe the position of an object?

Answer 26

We need to specify a reference point called the origin to describe position of an object

Question 27

Give an example when acceleration is in the direction of the motion. Write the S.I. unit of acceleration.

Answer 27

Freely falling body.
S.I. unit is ms-2

Question 28

Are rest and motion absolute or relative terms? Which speed is greater 30m/s or 30km/h?

Answer 28

They are relative terms.
30m/s

Question 29

What is the relation between linear velocity and angular velocity?

Answer 29

Linear velocity= angular velocity x radius of circular path.