Solution of Motion (Page No - 44) - Physics by Lakhmir Singh, Class 9

# Solution of Motion (Page No - 44) - Physics by Lakhmir Singh, Class 9 | Extra Documents & Tests for Class 9 PDF Download

Page No:44

Question 62:
Study the speed-time graph of a car given alongside and answer the following questions:

(i) What type of motion is represented by OA ?
(ii) What type of motion is represented by AB ?
(iii) What type of motion is represented by BC ?
(iv) What is the acceleration of car from O to A ?
(v)What is the acceleration of car from A to B ?
(vi) What is the retardation of car from B to C ?
Solution :
(i) OA represents uniform acceleration
(ii) AB represents constant speed.
(iii) BC represents uniform retardation.
(iv) Acceleration of car from O to A = slope of line OA

(v) Acceleration of car from A to B is zero as it has uniform speed during this time.
(vi) Retardation of car from B to C = slope of line BC

Question 63:
What type of motion is represented by each one of the following graphs ?

Solution :
(i) Graph (a) represents uniform acceleration.
(ii) Graph (b) represents constant speed.
(iii) Graph (c) represents uniform retardation.
(iv) Graph (d) represents non-uniform retardation.

Question 64:
A car is travelling along the road at 8 ms-1. It accelerates at 1 ms-2 for a distance of 18 m. How fast is it then travelling ?
Solution :
Initial velocity, u=8m/s
Acceleration, a=1m/s2
Distance, s=18m

Question 65:
A car is travelling at 20 m/s along a road. A child runs out into the road 50 m ahead and the car driver steps on the brake pedal. What must the car’s deceleration be if the car is to stop just before it reaches the child ?
Solution :
Initial velocity, u=20m/s
Final velocity, v=0m/s
Distance, s=50m

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## FAQs on Solution of Motion (Page No - 44) - Physics by Lakhmir Singh, Class 9 - Extra Documents & Tests for Class 9

 1. What is motion in physics?
Ans. Motion in physics refers to the change in position of an object with respect to its surroundings over time. It can be described in terms of displacement, velocity, and acceleration.
 2. How is motion measured in physics?
Ans. Motion is measured in physics using various parameters. Displacement is measured in meters (m), velocity is measured in meters per second (m/s), and acceleration is measured in meters per second squared (m/s^2).
 3. What are the different types of motion?
Ans. There are several types of motion in physics. These include linear motion (motion in a straight line), circular motion (motion along a circular path), oscillatory motion (back and forth motion), and rotational motion (motion of an object spinning on its axis).
 4. What is the difference between speed and velocity?
Ans. Speed is a scalar quantity that refers to the rate at which an object covers distance. It only considers magnitude. Velocity, on the other hand, is a vector quantity that refers to the rate at which an object changes its position. It considers magnitude as well as direction.
 5. How does acceleration affect motion?
Ans. Acceleration plays a crucial role in motion. If an object experiences acceleration, its velocity changes over time. This means the object either speeds up, slows down, or changes direction. Acceleration is directly proportional to the net force acting on an object and inversely proportional to its mass.

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