Physics
Class 9
Lakhmir Singh
1
Chapter 1: Motion
117 questions
Q1
Question 53:
The graph given alongside shows the positions of a body at different times. Calculate the speed of the body as it moves from :
Figure
(i) A to B,
(ii) B to C, and
(iii) C to D
Figure
(i) A to B,
(ii) B to C, and
(iii) C to D
Q2
Question 54:
What can you say about the motion of a body if :
(a) its displacement-time graph is a straight line?
(b) its velocity-time graph is a straight line?
(a) its displacement-time graph is a straight line?
(b) its velocity-time graph is a straight line?
Q3
Question 60:
The graph given alongside shows how the speed of a car changes with time :
Figure
(i) What is the initial speed of the car?
(ii) What is the maximum speed attained by the car?
(iii) Which part of the graph shows zero acceleration
(iv) Which part of the graph shows varying retardation?
(v) Find the distance travelled in first 8 hours.
View all questionFigure
(i) What is the initial speed of the car?
(ii) What is the maximum speed attained by the car?
(iii) Which part of the graph shows zero acceleration
(iv) Which part of the graph shows varying retardation?
(v) Find the distance travelled in first 8 hours.
2
Chapter 2: Force and Laws of Motion
114 questions
3
Chapter 3: Gravitation
157 questions
4
Chapter 4: Work and Energy
128 questions
5
Chapter 5: Sound
162 questions
Question
Question 54:
What can you say about the motion of a body if :
(a) its displacement-time graph is a straight line?
(b) its velocity-time graph is a straight line?
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Text solution
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Answer:
(a) The body has uniform velocity if its displacement –time graph is a straight line. If the straight line is parallel to the time axis then the magnitude of uniform velocity is zero.
(b) The body has a uniform acceleration if its velocity-time graph is a straight line. If the straight line is parallel to the time axis then the magnitude of uniform acceleration is zero.
(b) The body has a uniform acceleration if its velocity-time graph is a straight line. If the straight line is parallel to the time axis then the magnitude of uniform acceleration is zero.
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Practice more questions from Physics (Lakhmir Singh)
Q1
Question 53:
The graph given alongside shows the positions of a body at different times. Calculate the speed of the body as it moves from :
Figure
(i) A to B,
(ii) B to C, and
(iii) C to D
Figure
(i) A to B,
(ii) B to C, and
(iii) C to D
Q2
Question 54:
What can you say about the motion of a body if :
(a) its displacement-time graph is a straight line?
(b) its velocity-time graph is a straight line?
(a) its displacement-time graph is a straight line?
(b) its velocity-time graph is a straight line?
Q3
Question 60:
The graph given alongside shows how the speed of a car changes with time :
Figure
(i) What is the initial speed of the car?
(ii) What is the maximum speed attained by the car?
(iii) Which part of the graph shows zero acceleration
(iv) Which part of the graph shows varying retardation?
(v) Find the distance travelled in first 8 hours.
View allFigure
(i) What is the initial speed of the car?
(ii) What is the maximum speed attained by the car?
(iii) Which part of the graph shows zero acceleration
(iv) Which part of the graph shows varying retardation?
(v) Find the distance travelled in first 8 hours.
Practice questions from Physics (Lakhmir Singh)
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Question 4
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(b) The physical quantity that includes both the speed and direction of the motion of a body is called its __________.
(c) A motorcycle has a steady __________ of 3 m/s2. This means that each __________ its __________ increases by __________.
(d) Velocity is the rate of change of __________. It is measured in __________.
(e) Acceleration is the rate of change of __________. It is measured in __________.
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| Question Text | Question 54:
What can you say about the motion of a body if : (a) its displacement-time graph is a straight line? (b) its velocity-time graph is a straight line? |
| Topic | Motion |
| Subject | Science |
| Class | Class 9 |
| Answer Type | Text solution:1 |
| Upvotes | 56 |
