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The natural tendency of objects to resist a change in their state of rest or of uniform motion is called _____.- a)Inertia
- b)Momentum
- c)Acceleration
- d)Friction
Correct answer is option 'A'. Can you explain this answer?
The natural tendency of objects to resist a change in their state of rest or of uniform motion is called _____.
a)
Inertia
b)
Momentum
c)
Acceleration
d)
Friction
|
Let's Tute answered |
Inertia is the natural tendency of objects to resist a change in their state of rest or of uniform motion. It is a measure of an object's mass and is quantitatively described in kilograms (kg).
A bullet of mass 10g travelling horizontally with a velocity of 150ms−1 strikes a stationary wooden block and come to rest in 0.03s. Calculate the distance of penetration of the bullet into the block. Also, Calculate the magnitude of the force exerted by the wooden block on the bullet.- a)120 N
- b)50 N
- c)- 50 N
- d)- 120 N
Correct answer is option 'B'. Can you explain this answer?
A bullet of mass 10g travelling horizontally with a velocity of 150ms−1 strikes a stationary wooden block and come to rest in 0.03s. Calculate the distance of penetration of the bullet into the block. Also, Calculate the magnitude of the force exerted by the wooden block on the bullet.
a)
120 N
b)
50 N
c)
- 50 N
d)
- 120 N
|
|
Let's Tute answered |
- Initial velocity of the bullet, u = 150 m/s
- Final velocity of the bullet, v = 0
- Mass of the bullet, m = 10 g = 0.01 kg
- Time taken by the bullet to come to rest, t = 0.03 s
- Let the distance of penetration be s
Using the first equation of motion:
v = u + at
Substituting the known values:
0 = 150 + a(0.03)
⇒ a = -5000 m/s² (Negative sign indicates retardation)
v = u + at
Substituting the known values:
0 = 150 + a(0.03)
⇒ a = -5000 m/s² (Negative sign indicates retardation)
Now using the second equation of motion:
v² = u² + 2as
Substituting the known values:
0 = 150² + 2 × (-5000) × s
⇒ s = 2.25 m (Distance of penetration)
v² = u² + 2as
Substituting the known values:
0 = 150² + 2 × (-5000) × s
⇒ s = 2.25 m (Distance of penetration)
Magnitude of the force exerted by the wooden block:
Using |F| = m|a|
|F| = 0.01 × 5000 = 50 N
Using |F| = m|a|
|F| = 0.01 × 5000 = 50 N
So, the force exerted by the wooden block is 50 N.
What is the term used to describe the tendency of undisturbed objects to stay at rest or to keep moving with the same velocity?- a)Gravitation
- b)Inertia
- c)Acceleration
- d)Momentum
Correct answer is option 'B'. Can you explain this answer?
What is the term used to describe the tendency of undisturbed objects to stay at rest or to keep moving with the same velocity?
a)
Gravitation
b)
Inertia
c)
Acceleration
d)
Momentum
|
C K Academy answered |
- The correct answer is Option B: Inertia. Inertia is the property of matter by which it retains its state of rest or its velocity along a straight line, unless acted upon by an external force.
- For example, a body at rest tends to remain at rest, and a body in motion tends to continue moving at a constant velocity unless acted upon by an external force.
Assertion (A): An object moves with a uniform velocity when the forces acting on it are balanced.Reason (R): If there is no net external force acting on an object, its motion remains unchanged.- a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)If Assertion is true but Reason is false
- d)If both Assertion and Reason are false
Correct answer is option 'A'. Can you explain this answer?
Assertion (A): An object moves with a uniform velocity when the forces acting on it are balanced.
Reason (R): If there is no net external force acting on an object, its motion remains unchanged.
a)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
If Assertion is true but Reason is false
d)
If both Assertion and Reason are false
|
Elite Coaching Classes answered |
- The Assertion is correct. When the forces acting on an object are balanced, it either remains at rest or continues to move at a constant velocity according to Newton's First Law of Motion.
- The Reason is also correct. If there is no net external force acting on an object, it will maintain its current state of motion due to the absence of acceleration.
- Therefore, in this case, Option A is the correct answer as both the Assertion and Reason are true, and the Reason correctly explains the Assertion.
Assertion (A): When a gun is fired, it exerts a forward force on the bullet.Reason (R): The bullet exerts an equal and opposite force on the gun.- a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)If Assertion is true but Reason is false
- d)If both Assertion and Reason are false
Correct answer is option 'A'. Can you explain this answer?
Assertion (A): When a gun is fired, it exerts a forward force on the bullet.
Reason (R): The bullet exerts an equal and opposite force on the gun.
a)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
If Assertion is true but Reason is false
d)
If both Assertion and Reason are false
|
Jay Chavan answered |
Understanding the Assertion and Reason
The relationship between the assertion and reason in this scenario is rooted in Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction.
Assertion (A) Explained
- When a gun is fired, it exerts a forward force on the bullet.
- This is a direct consequence of the explosive reaction occurring inside the gun's chamber, which propels the bullet forward at high speed.
Reason (R) Explained
- The bullet exerts an equal and opposite force on the gun.
- According to Newton's Third Law, as the gun pushes the bullet forward, the bullet pushes back against the gun with the same amount of force in the opposite direction.
Relationship Between Assertion and Reason
- Both the assertion and reason are true statements.
- The reason provides the correct explanation for the assertion. The forward force exerted by the gun on the bullet is indeed matched by the backward force exerted by the bullet on the gun.
Conclusion
- Therefore, the correct answer is option 'A': both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- This understanding emphasizes the fundamental principles of motion and force, illustrating how interactions between objects follow predictable laws.
The relationship between the assertion and reason in this scenario is rooted in Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction.
Assertion (A) Explained
- When a gun is fired, it exerts a forward force on the bullet.
- This is a direct consequence of the explosive reaction occurring inside the gun's chamber, which propels the bullet forward at high speed.
Reason (R) Explained
- The bullet exerts an equal and opposite force on the gun.
- According to Newton's Third Law, as the gun pushes the bullet forward, the bullet pushes back against the gun with the same amount of force in the opposite direction.
Relationship Between Assertion and Reason
- Both the assertion and reason are true statements.
- The reason provides the correct explanation for the assertion. The forward force exerted by the gun on the bullet is indeed matched by the backward force exerted by the bullet on the gun.
Conclusion
- Therefore, the correct answer is option 'A': both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- This understanding emphasizes the fundamental principles of motion and force, illustrating how interactions between objects follow predictable laws.
Choose the correctly matched pair.- a)Action force - Gun recoil
- b)Reaction force - Bullet acceleration
- c)Action force - Pushing the ground backwards
- d)Reaction force - Muscular effort on the road
Correct answer is option 'C'. Can you explain this answer?
Choose the correctly matched pair.
a)
Action force - Gun recoil
b)
Reaction force - Bullet acceleration
c)
Action force - Pushing the ground backwards
d)
Reaction force - Muscular effort on the road
|
Gauri Nambiar answered |
Understanding Action and Reaction Forces
In physics, particularly in Newton's Third Law of Motion, every action has an equal and opposite reaction. This principle helps in understanding the interaction of forces in various scenarios. Let's break down the options provided.
Analysis of Each Option
- Action Force - Gun Recoil:
This is incorrect. The action force is the bullet being fired forward, while the reaction force is the gun recoiling backward.
- Reaction Force - Bullet Acceleration:
This is also incorrect. The bullet's acceleration is a result of the action force (the explosion pushing it forward), not a reaction force.
- Action Force - Pushing the Ground Backwards:
This is the correct option. When a person pushes against the ground while walking or jumping, they exert a force on the ground (action force). The ground then exerts an equal and opposite force back on the person (reaction force), propelling them forward. This interaction illustrates Newton's Third Law perfectly.
- Reaction Force - Muscular Effort on the Road:
This is incorrect because muscular effort is an action force exerted by the muscles on the ground, leading to a reaction force from the ground.
Conclusion
The correct answer is option 'C' because it accurately exemplifies Newton's Third Law, demonstrating the action of pushing against the ground and the corresponding reaction that enables movement. Understanding these forces is essential for grasping fundamental physics concepts.
In physics, particularly in Newton's Third Law of Motion, every action has an equal and opposite reaction. This principle helps in understanding the interaction of forces in various scenarios. Let's break down the options provided.
Analysis of Each Option
- Action Force - Gun Recoil:
This is incorrect. The action force is the bullet being fired forward, while the reaction force is the gun recoiling backward.
- Reaction Force - Bullet Acceleration:
This is also incorrect. The bullet's acceleration is a result of the action force (the explosion pushing it forward), not a reaction force.
- Action Force - Pushing the Ground Backwards:
This is the correct option. When a person pushes against the ground while walking or jumping, they exert a force on the ground (action force). The ground then exerts an equal and opposite force back on the person (reaction force), propelling them forward. This interaction illustrates Newton's Third Law perfectly.
- Reaction Force - Muscular Effort on the Road:
This is incorrect because muscular effort is an action force exerted by the muscles on the ground, leading to a reaction force from the ground.
Conclusion
The correct answer is option 'C' because it accurately exemplifies Newton's Third Law, demonstrating the action of pushing against the ground and the corresponding reaction that enables movement. Understanding these forces is essential for grasping fundamental physics concepts.
The rate of change of momentum is directly proportional to the _____ applied.- a)Time
- b)Mass
- c)Force
- d)Velocity
Correct answer is option 'C'. Can you explain this answer?
The rate of change of momentum is directly proportional to the _____ applied.
a)
Time
b)
Mass
c)
Force
d)
Velocity
|
Anshul Roy answered |
Understanding Momentum and Force
Momentum is a fundamental concept in physics, defined as the product of an object's mass and its velocity. The rate of change of momentum relates closely to the concept of force.
Newton's Second Law of Motion
- Newton's second law states that the force applied to an object is equal to the rate of change of momentum of that object.
- Mathematically, this is expressed as: Force = Change in Momentum / Time.
Direct Proportionality to Force
- The key point here is that the rate of change of momentum is directly proportional to the force applied. This means that if you apply a greater force, the change in momentum will be greater.
- Conversely, if the force is reduced, the change in momentum also decreases.
Why Not Other Options?
- Time (Option A): While time is a factor in the equation, the rate of change itself relates to the force applied, not merely the duration over which it acts.
- Mass (Option B): Mass is a component of momentum, but the rate of change of momentum itself is influenced by the force applied rather than the mass alone.
- Velocity (Option D): Although velocity is part of the momentum formula, the question specifically addresses the rate of change of momentum, which is fundamentally linked to the force exerted.
Conclusion
The correct answer is option 'C' (Force) because it directly influences how quickly momentum changes, according to Newton's laws of motion. Understanding this relationship is crucial in analyzing motion and forces in physics.
Momentum is a fundamental concept in physics, defined as the product of an object's mass and its velocity. The rate of change of momentum relates closely to the concept of force.
Newton's Second Law of Motion
- Newton's second law states that the force applied to an object is equal to the rate of change of momentum of that object.
- Mathematically, this is expressed as: Force = Change in Momentum / Time.
Direct Proportionality to Force
- The key point here is that the rate of change of momentum is directly proportional to the force applied. This means that if you apply a greater force, the change in momentum will be greater.
- Conversely, if the force is reduced, the change in momentum also decreases.
Why Not Other Options?
- Time (Option A): While time is a factor in the equation, the rate of change itself relates to the force applied, not merely the duration over which it acts.
- Mass (Option B): Mass is a component of momentum, but the rate of change of momentum itself is influenced by the force applied rather than the mass alone.
- Velocity (Option D): Although velocity is part of the momentum formula, the question specifically addresses the rate of change of momentum, which is fundamentally linked to the force exerted.
Conclusion
The correct answer is option 'C' (Force) because it directly influences how quickly momentum changes, according to Newton's laws of motion. Understanding this relationship is crucial in analyzing motion and forces in physics.
Choose the correctly matched pair:- a)Momentum - Mass x Velocity
- b)Second Law of Motion - Force = Mass x Distance
- c)Unit of Force - Kilogram per second
- d)Acceleration - Rate of change of Momentum
Correct answer is option 'A'. Can you explain this answer?
Choose the correctly matched pair:
a)
Momentum - Mass x Velocity
b)
Second Law of Motion - Force = Mass x Distance
c)
Unit of Force - Kilogram per second
d)
Acceleration - Rate of change of Momentum
|
EduRev Class 9 answered |
The correctly matched pair is Option A: Momentum - Mass x Velocity.
- Option A: Momentum - Mass x Velocity is correct.
By definition, momentum (p) is the product of the mass (m) of an object and its velocity (v), i.e., p = mv. - Option B: Second Law of Motion - Force = Mass x Distance is incorrect.
According to Newton's Second Law of Motion, the force (F) is equal to the mass (m) of an object multiplied by its acceleration (a), i.e., F = ma. - Option C: Unit of Force - Kilogram per second is incorrect.
The correct SI unit of force is the Newton (N), which is defined as kg·m/s² (kilogram meter per second squared). - Option D: Acceleration - Rate of change of Momentum is incorrect.
Acceleration is the rate of change of velocity, not momentum. The rate of change of momentum is related to force as per the Second Law of Motion.
Choose the correctly matched pair:- a)A fielder catching a ball - Decreases time of impact
- b)High jump on cushioned bed - Increases time of fall
- c)Karate player breaking ice - Decreases force applied
- d)First law of motion - F = ma
Correct answer is option 'B'. Can you explain this answer?
Choose the correctly matched pair:
a)
A fielder catching a ball - Decreases time of impact
b)
High jump on cushioned bed - Increases time of fall
c)
Karate player breaking ice - Decreases force applied
d)
First law of motion - F = ma
|
|
Elite Coaching Classes answered |
Option A: A fielder catching a ball - Decreases time of impact:
Incorrect: When a fielder catches a ball, he pulls his hands backward to increase the time of impact, which decreases the force exerted on his hands.
Incorrect: When a fielder catches a ball, he pulls his hands backward to increase the time of impact, which decreases the force exerted on his hands.
Option B: High jump on cushioned bed - Increases time of fall
Correct: In a high jump event, athletes fall on a cushioned bed or sand bed to increase the time it takes for them to come to a stop, thereby decreasing the force of impact.
Correct: In a high jump event, athletes fall on a cushioned bed or sand bed to increase the time it takes for them to come to a stop, thereby decreasing the force of impact.
Option C: Karate player breaking ice - Decreases force applied
Incorrect: A karate player breaks a slab of ice with a single blow by applying a large force over a very short period of time.
Incorrect: A karate player breaks a slab of ice with a single blow by applying a large force over a very short period of time.
Option D: First law of motion - F = ma
Incorrect: The first law of motion states that an object will remain at rest or in uniform motion unless acted upon by an external force. The equation F = ma is Newton's second law of motion.
Incorrect: The first law of motion states that an object will remain at rest or in uniform motion unless acted upon by an external force. The equation F = ma is Newton's second law of motion.
Thus, the correctly matched pair is Option B: (b) High jump on cushioned bed - Increases time of fall.
What force is required to accelerate a 2 kg mass at 5 m/s²?- a)8 N
- b)10 N
- c)12 N
- d)6 N
Correct answer is option 'B'. Can you explain this answer?
What force is required to accelerate a 2 kg mass at 5 m/s²?
a)
8 N
b)
10 N
c)
12 N
d)
6 N
|
Imk Pathshala answered |
To accelerate a 2 kg mass at 5 m/s², a force of 10 N is required as per the equation F = ma, where F is force, m is mass, and a is acceleration. This force is necessary to overcome the inertia and change the velocity of the object.
Chapter doubts & questions for Forces - Physics for EmSAT Achieve 2025 is part of EmSAT Achieve exam preparation. The chapters have been prepared according to the EmSAT Achieve exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for EmSAT Achieve 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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