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In which of the following examples of motion, can the body be considered approximately a point object:

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Important Questions on Motion in a Straight Line

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11th Assam Board

IMPORTANT

PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 3 - Motion in a Straight Line>EXERCISES>Q 3.2

The position-time $(x - t)$ graphs for two children $A$ and $B$ returning from their school $O$ to their homes $P$ and $Q$ respectively are shown in the figure. Choose the correct entries in the brackets below:
(a) $A$ lives closer to the school than $B$
(b) $A$ starts from the school earlier than $B$
(c) $A$ walks faster than $B$
(d) $A$ and $B$ reach home at the (same/different) time
(e) $A$ overtakes $B$ on the road (once/twice).

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IMPORTANT

PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 3 - Motion in a Straight Line>EXERCISES>Q 3.3

A woman starts from her home at

9.00 am

, walks with a speed of

5 km h^{- 1}

on a straight road up to her office

2.5 km

away, stays at office till

5.00 pm

, and returns home by an auto with a speed of

25 km h^{- 1}

. Choose suitable scale and plot the

x - t

graph of her motion.

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IMPORTANT

PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 3 - Motion in a Straight Line>EXERCISES>Q 3.4

A drunkard walking in a narrow lane takes

5

steps forward and

3

steps backward, followed again by

5

steps forward and

3

steps backward, and soon. Each step is

1 m

long and requires

1 s

. Plot the

x - t

graph of his motion. Determine graphically and otherwise how long the drunkard takes to fall in a pit

13 m

away from the start.

EASY

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IMPORTANT

PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 3 - Motion in a Straight Line>EXERCISES>Q 3.5

A jet aeroplane travelling at the speed of

500 k m h^{- 1}

eject it products of combustion at the speed of

1500 k m h^{- 1}

relative to the jet plane. What is the speed of the latter with respect to an observer on the ground?

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IMPORTANT

PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 3 - Motion in a Straight Line>EXERCISES>Q 3.6

A car moving along a straight highway with a speed of

126 k m h^{- 1}

is brought to a stop within a distance of

200 m

. What is the retardation of the car (assumed uniform), and how long does it take for the car to stop?

HARD

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IMPORTANT

PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 3 - Motion in a Straight Line>EXERCISES>Q 3.7

Two trains

A

and

B

of length

400 m

each are moving on two parallel tracks with a uniform speed of

72 k m h^{- 1}

in the same direction, with

A

ahead of

B

. The driver of

B

decides to overtake

A

and accelerates by

1 m / s^{2}

. If after

50 s

, the guard of

B

just brushes past the driver of

A

, what was the original distance between them?

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IMPORTANT

PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 3 - Motion in a Straight Line>EXERCISES>Q 3.8

On a two-lane road, car $A$ is travelling with a speed of

36 k m h^{- 1}

. Two cars $B$ and $C$ approach car

A

from opposite directions with a speed of

54 k m h^{- 1}

each. At a certain instant, when the distance

A B

is equal to

A C

, both being

1 km

B

decides to overtake $A$ before $C$ does. What minimum acceleration of car

B

is required to avoid an accident?

HARD

11th Assam Board

IMPORTANT

PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 3 - Motion in a Straight Line>EXERCISES>Q 3.9

Two towns

A

and

B

are connected by regular bus service with a bus leaving in either direction every

T

minutes. A man cycling with a speed of

20 k m h^{- 1}

in the direction,

A

B

notices that a bus goes past him every

18

min in the direction of his motion, and every

6

min in the opposite direction. What is the period

T

of the bus service and with what speed (assumed constant) do the buses ply on the road?

In which of the following examples of motion, can the body be considered approximately a point object:

Important Questions on Motion in a Straight Line

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