Class 9 Exam > Class 9 Videos > Introduction : Force & Laws of Motion - Science, Class 9
Introduction : Force & Laws of Motion - Science, Class 9 Video Lecture
FAQs on Introduction : Force & Laws of Motion - Science, Class 9 Video Lecture
| 1. What are the three laws of motion? |  |
Ans. The three laws of motion are:
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 with a constant velocity unless acted upon by an external force.
2. Newton's Second Law of Motion: It states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. This can be mathematically represented as F = ma, where F is the net force, m is the mass of the object, and a is the acceleration.
3. Newton's Third Law of Motion: It states that for every action, there is an equal and opposite reaction. This 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 the difference between mass and weight? | |
Ans. Mass and weight are two different concepts in physics:
Mass: Mass is the measure of the amount of matter in an object. It is a scalar quantity and remains constant regardless of the location of the object. Mass is usually measured in kilograms (kg).
Weight: Weight is the force exerted by a gravitational field on an object. It is a vector quantity and depends on the mass of the object and the acceleration due to gravity. Weight can vary depending on the location of the object. Weight is usually measured in newtons (N).
In simpler terms, mass is the quantity of matter present in an object, while weight is the force experienced by an object due to gravity.
| 3. How does Newton's first law of motion apply to everyday life? | |
Ans. Newton's first law of motion, also known as the law of inertia, is applicable to many everyday life situations. Some examples include:
1. A ball rolling on a flat surface comes to a stop if there is no external force acting on it. This is because of the inertia of motion stated in the first law.
2. When a car suddenly stops, the passengers inside tend to move forward due to their inertia. This is why seat belts are important as they provide a restraining force to prevent the passengers from getting hurt.
3. When a bus takes a sharp turn, passengers tend to lean towards the outside of the turn due to their inertia. This can be experienced while traveling on a bus or a train.
4. When a tablecloth is quickly pulled out from under a set of dishes, the dishes may remain in their original position due to their inertia. This is a classic demonstration of the first law.
| 4. How does Newton's second law of motion affect the motion of objects? | |
Ans. Newton's second law of motion states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. This law has the following effects on the motion of objects:
1. The greater the force applied to an object, the greater its acceleration will be. For example, pushing a car with more force will make it accelerate faster.
2. The greater the mass of an object, the smaller its acceleration will be for a given force. Heavier objects require more force to achieve the same acceleration as lighter objects.
3. The direction of the force determines the direction of the acceleration. If the force and acceleration are in the same direction, the object speeds up. If they are in opposite directions, the object slows down or changes direction.
In summary, Newton's second law of motion explains how the motion of an object changes when it is subjected to an external force.
| 5. Can you give an example of Newton's third law of motion? | |
Ans. Newton's third law of motion states that for every action, there is an equal and opposite reaction. Here is an example of this law:
When you jump off a boat onto the bank, you push against the boat with a certain force to propel yourself forward. According to Newton's third law, the boat will exert an equal and opposite force on you, pushing you forward towards the bank.
This can be observed in various situations, such as when you push against a wall and feel the wall pushing back, or when a rocket propels itself upwards by expelling gases downwards. In all these cases, the action and reaction forces are equal in magnitude but opposite in direction.
Text Transcript from Video
Aristotle stated that motion is caused
by a force in order to prove this he
took the example of a bow and an arrow
an arrow kept flying even after the
bowstring was no longer pushing it to
explain this he said that the air rushed
around behind the arrow and pushes it
forward we now know that this concept is
wrong as an arrow shot in a vacuum
chamber does not drop to the ground
all of a sudden doing further research
on this Galileo and Newton realized that
a force would only be needed to change
the arrows motion and not to make its
motion continue by this time the
scientists were well versed with the
measurement of motion but the reason as
to why a certain object would move in a
certain way is yet to be explored this
chapter deals with the why in this
question let us find out the answer of
this Y and gain a thorough understanding
of force and its types the effects of
force mass and inertia laws of motion
momentum and its conservation
by a force in order to prove this he
took the example of a bow and an arrow
an arrow kept flying even after the
bowstring was no longer pushing it to
explain this he said that the air rushed
around behind the arrow and pushes it
forward we now know that this concept is
wrong as an arrow shot in a vacuum
chamber does not drop to the ground
all of a sudden doing further research
on this Galileo and Newton realized that
a force would only be needed to change
the arrows motion and not to make its
motion continue by this time the
scientists were well versed with the
measurement of motion but the reason as
to why a certain object would move in a
certain way is yet to be explored this
chapter deals with the why in this
question let us find out the answer of
this Y and gain a thorough understanding
of force and its types the effects of
force mass and inertia laws of motion
momentum and its conservation
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Nov 24, 2024 Last updated |
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