Chapters
Chapter 2: Work and Energy
Chapter 3: Current Electricity
Chapter 4: Measurement of Matter
Chapter 5: Acids, Bases and Salts
Chapter 6: Classification of Plants
Chapter 7: Energy Flow in an Ecosystem
Chapter 8: Useful and Harmful Microbes
Chapter 9: Environmental Management
Chapter 10: Information Communication Technology (ICT)
Chapter 11: Reflection of Light
Chapter 12: Study of Sound
Chapter 13: Carbon : An important element
Chapter 14: Substances in Common Use
Chapter 15: Life Processes in Living Organisms
Chapter 16: Heredity and Variation
Chapter 17: Introduction to Biotechnology
Chapter 18: Observing Space : Telescopes
Chapter 1: Laws of Motion
Balbharati solutions for Science and Technology 9th Standard Maharashtra State Board Chapter 1 Laws of Motion Exercise [Pages 16 - 17]
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 . |
Clarify the difference
Distance and displacement
Clarify the difference
Uniform and non-uniform motion.
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 |
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.
Complete the sentence and explain them.
Deceleration is ___________ acceleration
When an object is in uniform circular motion, its ___________ changes at every point.
Complete the sentence and explain them.
During collision ___________ remains constant.
Complete the sentence and explain them .
The working of a rocket depneds on Newton's ________ law of motion .
Give scientific reason.
When an object falls freely to the ground , its acceleration is uniform.
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.
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.
Give scientific reason.
The velocity of an object at rest is considered to be uniform.
Take 5 examples from your surroundings and give explanation based on Newtons laws of motion.
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?
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?
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.
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
Balbharati solutions for Science and Technology 9th Standard Maharashtra State Board chapter 1 - Laws of Motion
Balbharati solutions for Science and Technology 9th Standard Maharashtra State Board 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 Science and Technology 9th Standard Maharashtra State Board solutions in a manner that help students grasp basic concepts better and faster.
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Concepts covered in Science and Technology 9th Standard Maharashtra State Board chapter 1 Laws of Motion are Motion and Rest, Acceleration and Retardation, Distance and Displacement, Speed, Velocity, Graphical Representation of Linear Motion, Displacement – Time Graph Or Distance – Time Graph, Types of Speed, Types of Velocity, Velocity - Time Graphs, Equations of Motion by Graphical Method, Derivation of Velocity - Time Relation by Graphical Method, Derivation of Displacement - Time Relation by Graphical Method, Derivation of Displacement - Velocity Relation by Graphical Method, Uniform Circular Motion, Newton's First Law of Motion, Balanced and Unbalanced Forces, Newton's Second Law of Motion, Newton’s Second Law of Motion in Terms of Rate of Change of Momentum, Newton's Third Law of Motion, Conservation of Linear Momentum and Its Principle, Types of Acceleration.
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