NCERT Solutions for Class 9 Science Chapter 9 : Force And Laws Of Motion

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The NCERT Solutions for Class 9 Science Chapter 9 Force And Laws Of Motion are provided in this article below. Some of the important concepts of Class 9 Science Chapter 9 Force and Laws of Motion are:

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NCERT Solutions for Class 9 Science Chapter 9

NCERT Solutions for Class 9 Science chapter 9

Important Topics for Class 9 Science Chapter 9 Force and Laws of Motion

Force can be used to change the magnitude of velocity of an object (that is, to make the object move faster or slower) or to change its direction of motion. It is an external agent that can potentially change the state of rest or motion of any body.

Balanced and Unbalanced Forces

Balanced force can be expressed as two magnitudes, typically equally, with opposite directional forces acting on a body. Unbalanced forces occurs when two forces are seen to act in opposite directions on a body and aren’t equal in either magnitude or in size.

Example of Balanced Force: When a vehicle is pushed with equal force from either sides, it will keep remaining at a resting state.
Example of Unbalanced Force: The movement of a seesaw.

Laws of Motion

Newton’s laws of motion are the fundamental building blocks of classical mechanics. Motion can be defined as the change in position of a body on basis of its surroundings in a respective time interval.

Example: What are the Newton’s laws of Motion?

Solution: Newton’s laws of Motion are:

First Law of Motion claims that a body will not change its state of rest or motion, unless an external force acts on it.
Second Law of Motion claims that the greater the mass of the body, the greater will the required force in order to accelerate it.
The Third Law of Motion claims that for every action, there is an equal and opposite reaction.

Conservation Laws

The laws of conservation include but are not limited to conservation of mass, energy, linear momentum and angular momentum. Conservation laws are known to deal with the fundamental forces of nature.

Example: Give two primary examples of conservation of energy.

Solution: The two primary examples of conservation of energy are:

Electrical energy being converted into sound energy.
Mechanical energy being converted into electrical energy.

Also Read:

Chapter Related Links
Law of Inertia	Unit of Moment of Inertia	Effects of Force
First Law of Motion	Second Law of Motion	Third Law of Motion
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CBSE X Related Questions

1.
Write the balanced chemical equations for the following reactions.
(a) Calcium hydroxide + Carbon dioxide \(→\) Calcium carbonate + Water
(b) Zinc + Silver nitrate \(→\) Zinc nitrate + Silver
(c) Aluminium + Copper chloride \(→\) Aluminium chloride + Copper
(d) Barium chloride + Potassium sulphate \(→\) Barium sulphate + Potassium chloride

View Solution

2.
Which of the statements about the reaction below are incorrect?
\(\text{ 2PbO(s) + C(s) → 2Pb(s) + C}O_2\text{(g)}\)
(a) Lead is getting reduced.
(b) Carbon dioxide is getting oxidized.
(c) Carbon is getting oxidized.
(d) Lead oxide is getting reduced.

(a) and (b)
(a) and (c)
(a), (b) and (c)
all

View Solution

3.
A milkman adds a very small amount of baking soda to fresh milk.
(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
(b) Why does this milk take a long time to set as curd?

View Solution

4.
Balance the following chemical equations.
(a) HNO₃ +Ca(OH)₂ \(→\) Ca(NO₃)₂ + H₂O
(b) NaOH + H₂SO₄ \(→\) Na₂SO₄ + H₂O
(c) NaCl + AgNO₃ \(→\) AgCl + NaNO₃
(d) BaCl + H₂ SO₄ \(→\) BaSO₄ + HCl

View Solution

5.
Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 10⁸ m s⁻¹.

View Solution

6.
Explain the following terms with one example each.
(a) Corrosion
(b) Rancidity

View Solution

View All

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NCERT Solutions for Class 9 Science Chapter 9 : Force And Laws Of Motion

Important Topics for Class 9 Science Chapter 9 Force and Laws of Motion

Balanced and Unbalanced Forces

Laws of Motion

Conservation Laws

CBSE X Related Questions

2.
Which of the statements about the reaction below are incorrect?
\(\text{ 2PbO(s) + C(s) → 2Pb(s) + C}O_2\text{(g)}\)
(a) Lead is getting reduced.
(b) Carbon dioxide is getting oxidized.
(c) Carbon is getting oxidized.
(d) Lead oxide is getting reduced.

3.
A milkman adds a very small amount of baking soda to fresh milk.
(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
(b) Why does this milk take a long time to set as curd?

4.
Balance the following chemical equations.
(a) HNO₃ +Ca(OH)₂ \(→\) Ca(NO₃)₂ + H₂O
(b) NaOH + H₂SO₄ \(→\) Na₂SO₄ + H₂O
(c) NaCl + AgNO₃ \(→\) AgCl + NaNO₃
(d) BaCl + H₂ SO₄ \(→\) BaSO₄ + HCl

5.
Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 10⁸ m s⁻¹.

6.
Explain the following terms with one example each.
(a) Corrosion
(b) Rancidity

Similar Science Concepts

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NCERT Solutions for Class 9 Science Chapter 9 : Force And Laws Of Motion

Important Topics for Class 9 Science Chapter 9 Force and Laws of Motion

Balanced and Unbalanced Forces

Laws of Motion

Conservation Laws

CBSE X Related Questions

2. Which of the statements about the reaction below are incorrect?\(\text{ 2PbO(s) + C(s) → 2Pb(s) + C}O_2\text{(g)}\)(a) Lead is getting reduced. (b) Carbon dioxide is getting oxidized. (c) Carbon is getting oxidized. (d) Lead oxide is getting reduced.

3. A milkman adds a very small amount of baking soda to fresh milk. (a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline? (b) Why does this milk take a long time to set as curd?

4. Balance the following chemical equations.(a) HNO3 +Ca(OH)2 \(→\) Ca(NO3)2 + H2O (b) NaOH + H2SO4 \(→\) Na2SO4 + H2O (c) NaCl + AgNO3 \(→\) AgCl + NaNO3 (d) BaCl + H2 SO4 \(→\) BaSO4 + HCl

5. Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 108 m s−1.

6. Explain the following terms with one example each. (a) Corrosion (b) Rancidity

Similar Science Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

2.
Which of the statements about the reaction below are incorrect?
\(\text{ 2PbO(s) + C(s) → 2Pb(s) + C}O_2\text{(g)}\)
(a) Lead is getting reduced.
(b) Carbon dioxide is getting oxidized.
(c) Carbon is getting oxidized.
(d) Lead oxide is getting reduced.

3.
A milkman adds a very small amount of baking soda to fresh milk.
(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
(b) Why does this milk take a long time to set as curd?

4.
Balance the following chemical equations.
(a) HNO₃ +Ca(OH)₂ \(→\) Ca(NO₃)₂ + H₂O
(b) NaOH + H₂SO₄ \(→\) Na₂SO₄ + H₂O
(c) NaCl + AgNO₃ \(→\) AgCl + NaNO₃
(d) BaCl + H₂ SO₄ \(→\) BaSO₄ + HCl

5.
Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 10⁸ m s⁻¹.

6.
Explain the following terms with one example each.
(a) Corrosion
(b) Rancidity