Frames of Reference

Q. If frame of reference is changed, which quantity may change its value ?

1. $\text{Speed}$
2. $\text{Acceleration}$
3. $\text{Velocity}$
4. $\text{All of the above}$

Q. Which of the following do not depend on the frame of reference?
$1$. Mass
$2$. Distance between two points
$3$. Velocity
$4$. Distance

Q. If frame of reference is changed, which quantity may change its value ?

1. $\text{Speed}$
2. $\text{Acceleration}$
3. $\text{Velocity}$
4. $\text{All of the above}$

Q. Two trains one of length $100\text{m}$ and another of length $125\text{m}$, are moving in mutually opposite directions along parallel lines, meet each other, each with speed $100\text{m/s}$. If their accelerations are $0.3{\text{m/s}}^2$ and $0.2{\text{m/s}}^2$ respectively, then the time they take to pass each other will be

1. $5s$
2. $10s$
3. $15s$
4. $20s$

Q. Which of the following do not depend on the frame of reference?
1. Mass
2. Distance between two points
3. Velocity
4. Distance

1. $1\text{and}2$
2. $2\text{and}3$
3. $1\text{and}4$
4. $1\text{and}3$

Q. An elevator without a ceiling is ascending up with an acceleration of $5{\text{ms}}^{-2}$. A boy on the elevator shoots a ball in vertical upward direction from a height of $2\text{m}$ above the floor of elevator. At this instant the elevator is moving up with a velocity of $10{\text{ms}}^{-1}$, and the floor of the elevator is at a height of $50\text{m}$ from the ground. The initial speed of the ball is $15{\text{ms}}^{-1}$ with respect to the elevator. Consider the duration for which the ball strikes the floor of elevator in answering following questions. ($g=10{\text{ms}}^{-2}$)

1. $2.13\text{s}$
2. $2.0\text{s}$
3. $1.0\text{s}$
4. $3.12\text{s}$

Q.

Journal entry of carriage inward

Q. While moving upwards in the lift, Nishant rolls a coin that covers $2\text{m}$ before coming to rest. How much does the coin travels with respect to Nishant from lift's frame of reference ?

1. $2\text{m}$
2. $0\text{m}$
3. $4\text{m}$
4. $9.8\text{m}$

Q. A river is flowing from W to E with a speed of $5\frac{m}{min}$. A man can swim in still water with a velocity 10 $\frac{m}{min}$. In which direction should the man swim so as to take the shortest possible path to go to the south.

1. ${30}^{\circ }$ with downstream
2. ${60}^{\circ }$ with downstream
3. ${120}^{\circ }$ with downstream
4. $South$

Q.

A reference point

1. can be the origin

2. is used to describe the position of the object

3. cannot be the origin

4. both (A) and (B)

Q. A river is flowing from W to E with a speed of $5\frac{m}{min}$. A man can swim in still water with a velocity 10 $\frac{m}{min}$. In which direction should the man swim so as to take the shortest possible path to go to the south.

1. ${30}^{\circ }$ with downstream
2. ${60}^{\circ }$ with downstream
3. ${120}^{\circ }$ with downstream
4. $South$