# Balbharati solutions for Science and Technology 9th Standard Maharashtra State Board chapter 1 - Laws of Motion [Latest edition]

#### Chapters ## Chapter 1: Laws of Motion

Exercise
Exercise [Pages 16 - 17]

### Balbharati solutions for Science and Technology 9th Standard Maharashtra State Board Chapter 1 Laws of Motion Exercise [Pages 16 - 17]

Exercise | Q 1 | Page 16

Match the first column with appropriate entries in the second and third columns and remake the table.

 S.No. Column 1 Column 2 Column 3 1 Negative acceleration The velocity of the object remains constant A car , intially at rest reaches a velocity of 50 km/hr in 10 seconds 2 Positive acceleration The velocity of the object decreases A vehicle is moving with a velocity of 25 m/s 3 Zero acceleration The velocity of the object increases A vehicle moving with the velocity of 10 m/s,stops after 5 seconds .
Exercise | Q 2.1 | Page 16

Clarify the difference
Distance and displacement

Exercise | Q 2.2 | Page 16

Clarify the difference
Uniform and non-uniform motion.

Exercise | Q 3 | Page 17

Complete the following table.

 u (m/s) a (m/s2) t (sec) v = u + at (m/s) 2 4 3 - - 5 2 20
 u (m/s) a (m/s2) t (sec) s = ut + 1/2at2 (m) 5 12 3 - 7 - 4 92
 u (m/s) a(m/s2) s (m) v2 = u2 + 2 as (m/s)2 4 3 - 8 - 5 8.4 10
Exercise | Q 4.1 | Page 17

Complete the sentence and explain them.

The minimum distance between the start and finish points of the motion of an object is called the _______ of the object.

Exercise | Q 4.2 | Page 17

Complete the sentence and explain them.
Deceleration is ___________ acceleration

Exercise | Q 4.3 | Page 17

Complete the sentences and explain them .

When an object is in uniform circular motion, its ___________ changes at every point.

Exercise | Q 4.4 | Page 17

Complete the sentence and explain them.

During collision ___________ remains constant.

Exercise | Q 4.5 | Page 17

Complete the sentence and explain them .
The working of a rocket depneds on Newton's ________ law of motion .

Exercise | Q 5.1 | Page 17

Give scientific reason.
When an object falls freely to the ground ,  its acceleration is uniform.

Exercise | Q 5.2 | Page 17

Give scientific reason.
Even though the magnitudes of action force and reaction force are equal and their directions are opposite, their effects do not get cancelled.

Exercise | Q 5.3 | Page 17

Give scientific reasons.
It is easier to stop a tennis ball as compared to a cricket ball when both are travelling with the same velocity.

Exercise | Q 5.4 | Page 17

Give scientific reason.
The velocity of an object at rest is considered to be uniform.

Exercise | Q 6 | Page 17

Take 5 examples from  your surroundings and give explanation based on Newtons laws of motion.

Exercise | Q 7.1 | Page 17

Solve the following example.

An object moves 18 m in the first 3 s, 22 m in the next 3 s and 14 m in the last 3 s. What is its average speed?

Exercise | Q 7.2 | Page 17

Solve the following example.
An object of mass 16 kg is moving with an acceleration of 3 m/s2. Calculate the applied force. If the same force is applied on an object of mass 24 kg, how much will be the acceleration?

Exercise | Q 7.3 | Page 17

Solve the following example.
A bullet having a mass of 10 g and moving with a speed of 1.5 m/s, penetrates a thick wooden plank of mass 90 g. The plank was initially at rest. The bullet gets embedded in the plank and both move together.  Determine their velocity.

Exercise | Q 7.4 | Page 17

Solve the following example.

A person swims 100 m in the first 40 s, 80 m in the next 40 s, and 45 m in the last 20 s. What is the average speed?

## Chapter 1: Laws of Motion

Exercise ## Balbharati solutions for Science and Technology 9th Standard Maharashtra State Board chapter 1 - Laws of Motion

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Concepts covered in Science and Technology 9th Standard Maharashtra State Board chapter 1 Laws of Motion are Concept of Motion, Displacement, Uniform and Non-uniform Linear Motion, Speed, Acceleration, Velocity Time Graph, Uniform Circular Motion, Balanced and Unbalanced Forces, Equations of Motion by Graphical Method, Newton's First Law of Motion, Graphical Representation of Motion: Distance - Time Graphs.

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