In the figure, the coefficient of friction between the floor and body B is 0.1. The coefficient of friction between bodies B and A is 0.2. A force F is applied as shown on B. The mass of A is rn/2 and of B is m.

a. The bodies will move together if F = O .25 mg
b. The A will slip with B if F = 0.5 mg
c. The bodies will move together if F = 0.5 mg
d. The bodies will be at rest if F = 0.1 mg
e The maximum value of F for which the two bodies will move together is 0.45 mg


Which of the following statement(s) is/are true?

1. (a, b, d, e)

2. (a, c, d, e)

3. (b, c, d)

4. (a, b, c)

Subtopic:  Application of Laws | Friction |
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The figure shows the position-time graph of a particle of mass \(4\) kg. What is the force on the particle for \(t>4\) s?  (Consider one-dimensional motion only).

       

1. \(0\) 
2. \(40~\mathrm{N}\) 
3. \(20~\mathrm{N}\) 
4. \(10~\mathrm{N}\)

Subtopic:  Application of Laws |
 81%
From NCERT
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Given below are two statements: 
Assertion (A): A man who falls from a height on a cement floor receives more injury than when he falls from the same height on a heap of sand.
Reason (R): The impulse applied by a cement floor is less than the impulse applied by a sand floor.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.


 
Subtopic:  Application of Laws |
 65%
From NCERT
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Given below are two statements: 
Assertion (A): A rocket moves forward by pushing the surrounding air backward.
Reason (R): It derives the necessary thrust to move forward according to Newton's first law of motion.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Application of Laws |
From NCERT
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Given below are two statements: 
Assertion (A): A rocket works on the principle of conservation of linear momentum.
Reason (R): Higher is the velocity, smaller is the pressure and vice-versa.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Application of Laws |
From NCERT
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Given below are two statements: 
Assertion (A): The driver in a vehicle moving at a constant speed on a straight road is in a non-inertial frame of reference.
Reason (R): A reference frame in which Newton's law of motion is applicable is non-inertial.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Application of Laws |
 56%
From NCERT
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Given below are two statements: 
Assertion (A): A man in a closed cabin, which is falling freely, does not experience gravity.
Reason (R): Inertial and gravitational mass have equivalence.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Application of Laws |
From NCERT
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Given below are two statements: 
Assertion (A): The principle of rocket propulsion is a special case of a variable mass system.
Reason (R): The principle of rocket propulsion can be explained by Newton's second law.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Application of Laws |
 54%
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