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Physics Part-I

Laws of motion

Figure shows the position-time graph of a particle of mass 4 k

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 man of mass

70

k g

stands on a weighing scale in a lift which is moving.
(a) Upwards with a uniform speed of

10

m s^{- 1}

.
(b) Downwards with a uniform acceleration of

5

m s^{- 2}

.
(c) Upwards with a uniform acceleration of

5

m s^{- 2}

.
What would be the reading on the scale in each case?
(d) What would be the reading if the lift mechanism failed and it hurtled down freely under gravity?

Figure shows the position-time graph of a particle of mass

4 k g

. What is the (a) force on the particle for

t 4 s, 0 < t < 4 s

(b) impulse at t = 0 and t = 4 s? (Consider one-dimensional motion only).

Two bodies of masses

10

k g

and

20

k g

respectively, kept on a smooth, horizontal surface are tied to the ends of a light string. A horizontal force

F

=

600

N

is applied to(i) A (ii) B along the direction of string. What is the tension in the string in each case?

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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: 3 mins

Figure shows the position-time graph of a particle of mass $4 k g$ . What is the (a) force on the particle for $t 4 s, 0 < t < 4 s$ (b) impulse at t = 0 and t = 4 s? (Consider one-dimensional motion only).

Name: Video solution 1: [Solved] Figure shows the position-time graph of a particle of mass 4kg. What is the (a) force on the particle for t4s,0<t<4s (b) impulse at t = 0 and t = 4 s? (Consider one-dimensional motion only). - Physics Part-I
Uploaded: 2023-02-27T14:37:28.000Z
Duration: 2 min
Description: Video solution 1: [Solved] Figure shows the position-time graph of a particle of mass 4kg. What is the (a) force on the particle for t4s,0<t<4s (b) impulse at t = 0 and t = 4 s? (Consider one-dimensional motion only). - Physics Part-I

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Updated on: Feb 27, 2023

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Physics Part-I (NCERT)

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Figure shows the position-time graph of a particle of mass

4 k g

. What is the (a) force on the particle for

t 4 s, 0 < t < 4 s

(b) impulse at t = 0 and t = 4 s? (Consider one-dimensional motion only).

14 mins ago

Discuss this question LIVE

14 mins ago

Text solutionVerified

(a)

F orce = ma

a = \frac{d ^{2} x}{d t ^{2}} = 0

for straight lines

Hence,

F = 0

for all the regions

(b) Impulse

= F \times t = m (v_{2} - v_{1})

v = \frac{d x}{d t}

For

t < 0, v = 0

0 < t < 4, v = 3/4 m / s

t > 4, v = 0

Impulse at

_{t = 0} : 4 \times (\frac{3}{4} - 0) = 3 m / s

Impulse at

_{t = 4} : 4 \times (0 - \frac{3}{4}) = - 3 m / s

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Practice more questions from Physics Part-I (NCERT)

A man of mass

70

k g

stands on a weighing scale in a lift which is moving.
(a) Upwards with a uniform speed of

10

m s^{- 1}

.
(b) Downwards with a uniform acceleration of

5

m s^{- 2}

.
(c) Upwards with a uniform acceleration of

5

m s^{- 2}

.
What would be the reading on the scale in each case?
(d) What would be the reading if the lift mechanism failed and it hurtled down freely under gravity?

Figure shows the position-time graph of a particle of mass

4 k g

. What is the (a) force on the particle for

t 4 s, 0 < t < 4 s

(b) impulse at t = 0 and t = 4 s? (Consider one-dimensional motion only).

Two bodies of masses

10

k g

and

20

k g

respectively, kept on a smooth, horizontal surface are tied to the ends of a light string. A horizontal force

F

=

600

N

is applied to(i) A (ii) B along the direction of string. What is the tension in the string in each case?

View all

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Question Text	Figure shows the position-time graph of a particle of mass $4 k g$ . What is the (a) force on the particle for $t 4 s, 0 < t < 4 s$ (b) impulse at t = 0 and t = 4 s? (Consider one-dimensional motion only).
Updated On	Feb 27, 2023
Topic	Laws of motion
Subject	Physics
Class	Class 11
Answer Type	Text solution:1 Video solution: 2
Upvotes	258
Avg. Video Duration	4 min

Figure shows the position-time graph of a particle of mass $4 k g$ . What is the (a) force on the particle for $t 4 s, 0 < t < 4 s$ (b) impulse at t = 0 and t = 4 s? (Consider one-dimensional motion only).

Text solutionVerified

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Figure shows the position-time graph of a particle of mass 4kg. What is the (a) force on the particle for t4s,0<t<4s (b) impulse at t = 0 and t = 4 s? (Consider one-dimensional motion only).

Text solutionVerified

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Figure shows the position-time graph of a particle of mass $4 k g$ . What is the (a) force on the particle for $t 4 s, 0 < t < 4 s$ (b) impulse at t = 0 and t = 4 s? (Consider one-dimensional motion only).