Assertion (A): | A standing bus suddenly accelerates. If there was no friction between the feet of a passenger and the floor of the bus, the passenger would move back. |
Reason (R): | In the absence of friction, the floor of the bus would slip forward under the feet of the passenger. |
1. | (A) is True but (R) is False. |
2. | (A) is False but (R) is True. |
3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Assertion (A): | Newton's law of action and reaction is a consequence of Newton's law of inertia. |
Reason (R): | Newton's law of inertia implies that any body that is not acted upon by external forces cannot change its state of rest or uniform motion. |
1. | (A) is true but (R) is false. |
2. | (A) is false but (R) is true. |
3. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
4. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
Statement I: | (Newton's 1st Law of Motion) Everybody continues in its state of rest or of uniform motion in a straight line except in so far as it be compelled by an externally impressed force to act otherwise. |
Statement II: | It is observed that when a car brakes suddenly, the passengers are thrown forward. |
1. | Statement I is true, Statement II is true, and Statement I is the correct explanation of Statement II. |
2. | Statement I is true, Statement II is true, and Statement I is not the correct explanation of Statement II. |
3. | Statement I is true, Statement II is false. |
4. | Statement I is false, Statement II is true. |
A block of mass \(M\) lies at rest on a horizontal table.
Statement I: | (Newton's 3rd Law) To every action, there is an equal and opposite reaction. Action and reaction forces act on different bodies and in opposite directions. |
Statement II: | The normal reaction is the reaction force, while the weight is the action. |
1. | Statement I is True, Statement II is True and Statement I is the correct reason for Statement II. |
2. | Statement I is True, Statement II is True and Statement I is not the correct reason for Statement II. |
3. | Statement I is True, Statement II is False. |
4. | Statement I is False, Statement II is True. |
Consider the following two statements
A: | The linear momentum of a particle is independent of the frame of reference. |
B: | The kinetic energy of a particle is independent of the frame of reference. |
1. | Both A and B are true |
2. | A is true but B is false |
3. | A is false but B is true |
4. | Both A and B are false |
Mark the correct statements about the friction between two bodies.
(a) | static friction is always greater than kinetic friction. |
(b) | coefficient of static friction is always greater than the coefficient of kinetic friction. |
(c) | limiting friction is always greater than kinetic friction. |
(d) | limiting friction is never less than static friction. |
Choose the correct option:
1. | (a), (b) and (c) |
2. | (b), (c) and (d) |
3. | (a) and (d) |
4. | (c) and (d) |
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)
A particle is on a smooth horizontal plane. A force F is applied, whose F-t graph is given.
Consider the following statements.
a. At time , acceleration is constant.
b. Initially the particle must be at rest.
c. At time , acceleration is constant.
d. The initial acceleration is zero.
Select the correct statement(s):
1. | (a), (c) | 2. | (a), (b), (d) |
3. | (c), (d) | 4. | (b), (c) |
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. \(10~\mathrm{N}\)