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FAQs on Mindmap: Force and Laws of Motion - Subject-Wise Mind Maps for Class 9

1. What is Newton's first law of motion?
Ans. Newton's first law of motion, also known as the law of inertia, states that an object at rest will stay at rest, and an object in motion will stay in motion with the same velocity unless acted upon by an external force.
2. What is the difference between mass and weight?
Ans. Mass is a measure of the amount of matter in an object, while weight is the force exerted on an object due to gravity. Mass remains constant, regardless of the gravitational pull, whereas weight can vary depending on the strength of gravity.
3. How does Newton's second law of motion relate to force?
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. In simpler terms, force equals mass times acceleration, so the greater the force applied to an object, the greater the acceleration it will experience.
4. Can an object be in motion without any force acting on it?
Ans. No, according to Newton's first law of motion, an object at rest will stay at rest unless acted upon by an external force. Similarly, an object in motion will continue moving with the same velocity unless an external force acts upon it. Therefore, motion requires the presence of a force.
5. What is the relationship between action and reaction forces?
Ans. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object exerts an equal and opposite force back on the first object. The action and reaction forces act on different objects and are equal in magnitude but opposite in direction.
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