SSC (English Medium) Class 9Maharashtra State Board
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Balbharati solutions for Class 9 Science and Technology chapter 1 - Laws of Motion

Balbharati Class 9 Science and Technology

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Balbharati Balbharati Class 9 Science and Technology

Balbharati Class 9 Science and Technology - Shaalaa.com

Chapter 1: Laws of Motion

Exercise

Chapter 1: Laws of Motion Exercise Exercise solutions [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 - 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 reason.
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?     (Ans : 6 m/s)

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?     (Ans: 48 N, 2 m/s2) 

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.     (Ans: 0.15 m/s) 

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?             (Ans: 2.25 m/s2)

Chapter 1: Laws of Motion

Exercise

Balbharati Balbharati Class 9 Science and Technology

Balbharati Class 9 Science and Technology - Shaalaa.com

Balbharati solutions for Class 9 Science and Technology chapter 1 - Laws of Motion

Balbharati solutions for Class 9 chapter 1 (Laws of Motion) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Maharashtra State Board Balbharati Class 9 Science and Technology solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com are providing such solutions so that students can prepare for written exams. Balbharati textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 9 Science and Technology chapter 1 Laws of Motion are Balanced and Unbalanced Forces, Newton'S Laws of Motion, Uniform Circular Motion, Equations of Motion Using Graphical Method, Velocity Time Graph, Distance Time Graph, Acceleration, Uniform and Non-uniform Linear Motion, Speed and Velocity, Distance and Displacement, Motion (Introduction).

Using Balbharati Class 9 solutions Laws of Motion exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Balbharati Solutions are important questions that can be asked in the final exam. Maximum students of Maharashtra State Board Class 9 prefer Balbharati Textbook Solutions to score more in exam.

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