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Physics Part-I

Laws of motion

Give the magnitude and direction of the net force acting on a

Physics Part-I

Class 11

NCERT

Chapter 1: Physical World

16 questions

Chapter 2: Units and Measurements

51 questions

Chapter 3: Motion in Straight Line

50 questions

Chapter 4: Motion in a Plane

43 questions

Chapter 5: Laws of motion

52 questions

A pebble of mass

0.05 k g

is thrown vertically upwards. Give the direction and magnitude of the net force on the pebble,
(a) during its upward motion,
(b) during its downward motion,
(c) at the highest point where it is momentarily at rest. Do your answers change if the pebble was thrown at an angle of

4 5^{o}

with the horizontal direction?
Ignore air resistance.

Give the magnitude and direction of the net force acting on a stone of mass

0.1

k g

.(a) Just after it is dropped from the window of a stationary train.(b) Just after it is dropped from the window of a train running at a constant velocity of

36

km / h

.(c) Just after it is dropped from the window of a train accelerating with

1

m s^{- 2}

.(d) Lying on the floor of a train which is accelerating with

1

m s^{- 2}

, the stone being at rest relative to the train. Neglect air resistance throughout

One end of a string of length

l

is connected to a particle of mass

m

and the other to a small peg on a smooth horizontal table. If the particle moves in a circle with speed

v

the net force on the particle ( directed towards the centre ) is :

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33 questions

Question

Easy

Solving time: 1 mins

Give the magnitude and direction of the net force acting on a stone of mass $0.1$ $k g$ .(a) Just after it is dropped from the window of a stationary train.(b) Just after it is dropped from the window of a train running at a constant velocity of $36$ $km / h$ .(c) Just after it is dropped from the window of a train accelerating with $1$ $m s^{- 2}$ .(d) Lying on the floor of a train which is accelerating with $1$ $m s^{- 2}$ , the stone being at rest relative to the train. Neglect air resistance throughout

Uploaded: 2022-10-25T07:58:03.000Z
Duration: 14 min

Views: 6,035 students

Updated on: Oct 25, 2022

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Physics Part-I (NCERT)

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Jack Discussed

Give the magnitude and direction of the net force acting on a stone of mass

0.1

k g

.(a) Just after it is dropped from the window of a stationary train.(b) Just after it is dropped from the window of a train running at a constant velocity of

36

km / h

.(c) Just after it is dropped from the window of a train accelerating with

1

m s^{- 2}

.(d) Lying on the floor of a train which is accelerating with

1

m s^{- 2}

, the stone being at rest relative to the train. Neglect air resistance throughout

15 mins ago

Discuss this question LIVE

15 mins ago

Text solutionVerified

(a) Here, m = 0.1 Kg,

a = g = 10 m / s^{2}

Net force,

F = ma = 1 N

This force acts vertically downwards.

(b) When the train is running at a constant velocity, its acceleration

= 0

, No force acts on the stone due to this motion.

Therefore, force on the stone

F =

weight of stone

= m g = 0.1 \times 10 = 1.0 N

This force also acts vertically downwards.

m / s^{2}

an additional force

F^{'} = ma = 0.1 \times 1 = 0.1 N

acts on the stone in the horizontal direction.

But once the stone is dropped from the train,

F' becomes zero and the net force on the stone is

F = m g = 0.1

\times

10 = 1.0 N

, acting vertically downwards.

(d) As the stone is lying on the floor of the train, its acceleration is the same as that of the train.

force acting on stone,

F = ma = 0.1 \times 1 = 0.1 N

This force is along the horizontal direction of motion of the train.

Note that in each case, the weight of the stone is being balanced by the normal reaction.

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Practice more questions from Physics Part-I (NCERT)

A pebble of mass

0.05 k g

4 5^{o}

with the horizontal direction?
Ignore air resistance.

Give the magnitude and direction of the net force acting on a stone of mass

0.1

k g

.(a) Just after it is dropped from the window of a stationary train.(b) Just after it is dropped from the window of a train running at a constant velocity of

36

km / h

.(c) Just after it is dropped from the window of a train accelerating with

1

m s^{- 2}

.(d) Lying on the floor of a train which is accelerating with

1

m s^{- 2}

, the stone being at rest relative to the train. Neglect air resistance throughout

One end of a string of length

l

is connected to a particle of mass

m

and the other to a small peg on a smooth horizontal table. If the particle moves in a circle with speed

v

the net force on the particle ( directed towards the centre ) is :

View all

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Question Text	Give the magnitude and direction of the net force acting on a stone of mass $0.1$ $k g$ .(a) Just after it is dropped from the window of a stationary train.(b) Just after it is dropped from the window of a train running at a constant velocity of $36$ $km / h$ .(c) Just after it is dropped from the window of a train accelerating with $1$ $m s^{- 2}$ .(d) Lying on the floor of a train which is accelerating with $1$ $m s^{- 2}$ , the stone being at rest relative to the train. Neglect air resistance throughout
Updated On	Oct 25, 2022
Topic	Laws of motion
Subject	Physics
Class	Class 11
Answer Type	Text solution:1 Video solution: 1
Upvotes	106
Avg. Video Duration	14 min

Text solutionVerified

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