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Chapters
2: Work and Energy
3: Current Electricity
4: Measurement of Matter
5: Acids, Bases and Salts
6: Classification of Plants
7: Energy Flow in an Ecosystem
8: Useful and Harmful Microbes
9: Environmental Management
10: Information Communication Technology (ICT)
11: Reflection of Light
12: Study of Sound
13: Carbon: An important element
14: Substances in Common Use
15: Life Processes in Living Organisms
16: Heredity and Variation
17: Introduction to Biotechnology
18: Observing Space: Telescopes
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Solutions for Chapter 1: Laws of Motion
Below listed, you can find solutions for Chapter 1 of Maharashtra State Board Balbharati for Science and Technology [English] 9 Standard Maharashtra State Board.
Balbharati solutions for Science and Technology [English] 9 Standard Maharashtra State Board 1 Laws of Motion Exercises [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, initially 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 |
Complete the following table.
| u (m/s) | a (m/s2) | t (sec) | s = ut + `1/2`at2 (m) |
| 5 | 12 | 3 | ______ |
| 7 | ______ | 4 | 92 |
Complete the following table.
| u (m/s) | a (m/s2) | s (m) | v2 = u2 + 2as (m/s)2 |
| 4 | 3 | ______ | 8 |
| ______ | 5 | 8.4 | 10 |
Complete a sentence and explain it.
The minimum distance between the start and finish points of the motion of an object is called the ______ of the object.
Complete a sentence and explain it.
Deceleration is ______ acceleration.
Complete a sentence and explain it.
When an object is in uniform circular motion, its ______ changes at every point.
Complete a sentence and explain it.
During a collision, ______ remains constant.
Complete a sentence and explain it.
The working of a rocket depends on Newton's ______ law of motion.
Give a scientific reason.
When an object falls freely to the ground, its acceleration is uniform.
Give a scientific reason.
Even though the magnitudes of action force and reaction forces 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 reasons.
The velocity of an object at rest is considered to be uniform.
Take 5 examples from your surroundings and give an explanation based on Newton's laws of motion.
Solve the following examples.
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?
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 to an object of mass 24 kg, how much will be the acceleration?
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 900 g. The plank was initially at rest. The bullet gets embedded in the plank and both move together. Determine their velocity.
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?
Solutions for 1: Laws of Motion
Balbharati solutions for Science and Technology [English] 9 Standard Maharashtra State Board chapter 1 - Laws of Motion
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Concepts covered in Science and Technology [English] 9 Standard Maharashtra State Board chapter 1 Laws of Motion are Motion and Rest, Acceleration and Retardation, Effect of Speed and Direction on Velocity, Uniform and Non-uniform Motion, Newton’s Laws of Motion, Distance and Displacement, Graphical Representation of Motion, 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 (UCM), Newton's First Law of Motion, Newton's Second Law of Motion, Newton's Third Law of Motion, Conservation of Linear Momentum and Its Principle, Types of Acceleration, Speed and Velocity, Displacement - Time Graph Or Distance - Time Graph.
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