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DAV PUBLIC SCHOOL, THANE
SCIENCE DEPARTMENT
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DAV PUBLIC SCHOOL, THANE
SCIENCE DEPARTMENT
FORCE AND LAWS OF MOTION
BY: SNEHA DHARIYA
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DAV PUBLIC SCHOOL, THANE
SCIENCE DEPARTMENT
FORCE AND LAWS OF MOTION
BY: SNEHA DHARIYA
THE DRAWER IS PULLED
Page 4


DAV PUBLIC SCHOOL, THANE
SCIENCE DEPARTMENT
FORCE AND LAWS OF MOTION
BY: SNEHA DHARIYA
THE DRAWER IS PULLED THE DOOR IS PUSHED
Page 5


DAV PUBLIC SCHOOL, THANE
SCIENCE DEPARTMENT
FORCE AND LAWS OF MOTION
BY: SNEHA DHARIYA
THE DRAWER IS PULLED THE DOOR IS PUSHED

FAQs on Force & Law's of Motion - PowerPoint Presentation- Science, Class 9 - Class 8

1. What are the three laws of motion?

Ans. The three laws of motion, formulated by Sir Isaac Newton, are as follows: 1. Newton's First Law of Motion: Also known as the law of inertia, it states that an object at rest will remain at rest, and an object in motion will continue moving in a straight line at a constant velocity unless acted upon by an external force. 2. Newton's Second Law of Motion: This law relates the force acting on an object to its mass and acceleration. It states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. 3. Newton's Third Law of Motion: According to this law, for every action, there is an equal and opposite reaction. It means that whenever an object exerts a force on another object, the second object exerts an equal and opposite force on the first object.

2. What is inertia?

Ans. Inertia is the property of an object to resist any change in its state of motion. It is related to Newton's First Law of Motion. An object at rest tends to stay at rest, and an object in motion tends to stay in motion with the same speed and direction unless acted upon by an external force. Inertia depends on the mass of an object; the greater the mass, the greater the inertia. For example, it is harder to push a heavy object than a light one because the heavy object has more inertia.

3. How does Newton's Second Law of Motion explain the relationship between force, mass, and acceleration?

Ans. Newton's Second Law of Motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Mathematically, it can be represented as F = ma, where F is the net force, m is the mass of the object, and a is the acceleration produced. This equation shows that if the force acting on an object increases, the acceleration will also increase, provided the mass remains constant. Similarly, if the mass of an object increases, the acceleration will decrease for the same force applied.

4. Can you give an example of Newton's Third Law of Motion?

Ans. Yes, a classic example of Newton's Third Law of Motion is the action-reaction pair of forces when a person jumps off a boat onto a dock. As the person pushes off the boat, they exert a force backward (action) on the boat. Simultaneously, according to Newton's Third Law, the boat exerts an equal and opposite force forward (reaction) on the person. These action and reaction forces are equal in magnitude but act in opposite directions.

5. How do the laws of motion explain everyday phenomena?

Ans. The laws of motion explain various everyday phenomena. For example: - The seatbelt in a car prevents passengers from moving forward during sudden braking, as per Newton's First Law of Motion. - The ability to kick a ball or hit a cricket ball farther by applying a greater force demonstrates Newton's Second Law of Motion. - Rocket propulsion works on the principle of Newton's Third Law of Motion, where the action of expelling gases downward produces an equal and opposite reaction, propelling the rocket upward.

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