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Physics Part-I

Laws of motion

A pebble of mass 0.05 kg is thrown vertically upwards. Give th

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

Give the magnitude and direction of the net force acting on

(a) A drop of rain falling down with a constant speed.
(b) A cork of mass

10

g

floating on water.
(c) A kite skillfully held stationary in the sky.
(d) A car moving with a constant velocity of

30

km / h

on a rough road.
(e) A high-speed electron in space far from all material objects, and free of electric and magnetic fields.

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

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Chapter 6: Work, Energy and Power

41 questions

Chapter 7: System of Particles and Rotational Motion

45 questions

Chapter 8: Gravitation

33 questions

Question

Easy

Solving time: 2 mins

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.

Name: Video solution 1: [Solved] A pebble of mass 0.05kg 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 45o with the horizontal direction? Ignore air resistance. - Physics Part-I
Uploaded: 2022-02-22T06:06:17.000Z
Duration: 5 min

Views: 6,355 students

Updated on: Sep 27, 2022

Book:

Physics Part-I (NCERT)

Found 5 tutors discussing this question

Sebastian Discussed

A pebble of mass

0.05 k g

4 5^{o}

with the horizontal direction?
Ignore air resistance.

12 mins ago

Discuss this question LIVE

12 mins ago

Text solutionVerified

0.5 N

, in vertically downward direction, in all cases
Acceleration due to gravity, irrespective of the direction of motion of an object, always acts downward. The gravitational force is the only force that acts on the pebble in all three cases. Its magnitude is given by Newtons second law of motion as:

F = ma

Where,

F =

Net force

m =

Mass of the pebble

= 0.05 k g

a = g =

10 m / s^{2}

F = 0.05

\times

10 = 0.5 N

The net force on the pebble in all three cases is

0.5 N

and this force acts in the downward direction.

If the pebble is thrown at an angle of

4 5^{o}

with the horizontal direction, it will have both the horizontal and vertical components of velocity. At the highest point, only the vertical component of velocity becomes zero. However, the pebble will have the horizontal component of velocity throughout its motion. This component of velocity produces no effect on the net force acting on the pebble.

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Practice more questions from Physics Part-I (NCERT)

Give the magnitude and direction of the net force acting on

(a) A drop of rain falling down with a constant speed.
(b) A cork of mass

10

g

floating on water.
(c) A kite skillfully held stationary in the sky.
(d) A car moving with a constant velocity of

30

km / h

on a rough road.
(e) A high-speed electron in space far from all material objects, and free of electric and magnetic fields.

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

View all

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Question Text	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.
Updated On	Sep 27, 2022
Topic	Laws of motion
Subject	Physics
Class	Class 11
Answer Type	Text solution:1 Video solution: 2
Upvotes	267
Avg. Video Duration	7 min

Text solutionVerified

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