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Physics Part-I

Laws of motion

The driver of a three-wheeler moving with a speed of 36 km/h s

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 body of mass

5 k g

is acted upon by two perpendicular forces

8 N

and

6 N

.Give the magnitude and direction of the acceleration of the body.

The driver of a three-wheeler moving with a speed of

36

km / h

sees a child standing in the middle of the road and brings his vehicle to rest in

4.0

s

just in time to save the child. What is the average retarding force on the vehicle? The mass of the three-wheeler is

400

k g

and the mass of the driver is

65

k g

A rocket with a lift-off mass

20, 000 k g

is blasted upwards with an initial acceleration of

5.0 m s^{- 2}

. Calculate the initial thrust (force) of the blast.

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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

The driver of a three-wheeler moving with a speed of $36$ $km / h$ sees a child standing in the middle of the road and brings his vehicle to rest in $4.0$ $s$ just in time to save the child. What is the average retarding force on the vehicle? The mass of the three-wheeler is $400$ $k g$ and the mass of the driver is $65$ $k g$ .

Views: 5,857 students

Updated on: Sep 16, 2023

Book:

Physics Part-I (NCERT)

Found 7 tutors discussing this question

Benjamin Discussed

The driver of a three-wheeler moving with a speed of

36

km / h

sees a child standing in the middle of the road and brings his vehicle to rest in

4.0

s

just in time to save the child. What is the average retarding force on the vehicle? The mass of the three-wheeler is

400

k g

and the mass of the driver is

65

k g

14 mins ago

Discuss this question LIVE

14 mins ago

Text solutionVerified

Given:

Initial speed of the three-wheeler,

u = 36 km / h = 10 m / s

Final speed of the three-wheeler,

v = 0

m/s

Time,

t = 4

Mass of the three-wheeler,

m = 400

Mass of the driver,

m^{'} = 65

Total mass of the system,

M = 400 + 65 = 465

Using the first law of motion, the acceleration (a) of the three-wheeler can be calculated as:

v = u + a t

a = \frac{( v - u )}{t} = \frac{( 0 - 10 )}{4} = - 2.5 m / s^{2}

The negative sign indicates that the velocity of the three-wheeler is decreasing with time.

Using Newton's second law of motion, the net force acting on the three-wheeler can be calculated as:

F = M a = 465 \times (- 2.5) = - 1162.5 N

The negative sign indicates that the force is acting against the direction of motion of the three-wheeler.

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Practice more questions from Physics Part-I (NCERT)

A body of mass

5 k g

is acted upon by two perpendicular forces

8 N

and

6 N

.Give the magnitude and direction of the acceleration of the body.

The driver of a three-wheeler moving with a speed of

36

km / h

sees a child standing in the middle of the road and brings his vehicle to rest in

4.0

s

just in time to save the child. What is the average retarding force on the vehicle? The mass of the three-wheeler is

400

k g

and the mass of the driver is

65

k g

A rocket with a lift-off mass

20, 000 k g

is blasted upwards with an initial acceleration of

5.0 m s^{- 2}

. Calculate the initial thrust (force) of the blast.

View all

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Question Text	The driver of a three-wheeler moving with a speed of $36$ $km / h$ sees a child standing in the middle of the road and brings his vehicle to rest in $4.0$ $s$ just in time to save the child. What is the average retarding force on the vehicle? The mass of the three-wheeler is $400$ $k g$ and the mass of the driver is $65$ $k g$ .
Updated On	Sep 16, 2023
Topic	Laws of motion
Subject	Physics
Class	Class 11
Answer Type	Text solution:1 Video solution: 3
Upvotes	242
Avg. Video Duration	11 min

Text solutionVerified

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