Grade 9 Exam > Grade 9 Videos > Physics for Grade 9 > Newton's First Law of Motion
Newton's First Law of Motion Video Lecture | Physics for Grade 9
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FAQs on Newton's First Law of Motion Video Lecture - Physics for Grade 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 remain at rest and an object in motion will continue moving in a straight line at a constant speed, unless acted upon by an external force.
| 2. What is meant by inertia? | |
Ans. Inertia is the property of an object to resist any change in its state of motion. It is directly related to the mass of the object. Objects with more mass have more inertia and are harder to move or stop.
| 3. How does Newton's First Law of Motion apply to everyday life? | |
Ans. Newton's First Law of Motion applies to everyday life in various ways. For example, when a car suddenly stops, passengers tend to move forward due to their inertia. Similarly, when a bus takes a sharp turn, the passengers tend to lean towards the opposite direction due to their inertia.
| 4. Can an object in motion come to rest without any external force acting upon it? | |
Ans. No, according to Newton's First Law of Motion, an object in motion will continue moving in a straight line at a constant speed, unless acted upon by an external force. Therefore, an object in motion cannot come to rest without any external force acting upon it.
| 5. How does Newton's First Law of Motion relate to sports? | |
Ans. Newton's First Law of Motion is relevant in various sports. For example, when a soccer ball is kicked, it continues to move until it is acted upon by the frictional force of the ground or the force of another player. Similarly, a baseball thrown in the air follows a parabolic path due to the absence of external forces acting upon it.
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