Physics
Class 9
Lakhmir Singh
1
Chapter 1: Motion
117 questions
2
Chapter 2: Force and Laws of Motion
114 questions
3
Chapter 3: Gravitation
157 questions
4
Chapter 4: Work and Energy
128 questions
Q1
Question 69:
Which of the following does not posses the ability to do work not because of motion?
(a) a sparrow flying in the sky
(b) a sparrow moving slowly on the ground
(c) a sparrow in the nest on a tree
(d) a squirrel going up a tree
(a) a sparrow flying in the sky
(b) a sparrow moving slowly on the ground
(c) a sparrow in the nest on a tree
(d) a squirrel going up a tree
Q2
Question 70:
A stone is thrown upwards as shown in the diagram. When it reaches P, which of the following has the greatest value of the stone?
Figure
(a) its acceleration
(b) its kinetic energy
(c) its potential energy
(d) its weight
Figure
(a) its acceleration
(b) its kinetic energy
(c) its potential energy
(d) its weight
Q3
Question 71:
A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
View all question5
Chapter 5: Sound
162 questions
Question
Question 70:
A stone is thrown upwards as shown in the diagram. When it reaches P, which of the following has the greatest value of the stone?
Figure
(a) its acceleration
(b) its kinetic energy
(c) its potential energy
(d) its weight
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Text solution
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Answer:
When a stone is thrown vertically upwards, the following conclusions can be done for point P,
(a) The acceleration for the entire journey of the stone is constant, as acceleration due to gravity near the surface of the earth is constant.
(b) The velocity of the stone at P will be the least. Hence, kinetic energy at this point will be the least.
(c) The stone is at a maximum height at point P. Hence, the potential energy is the maximum at P.
(d) Weight of the stone will remain nearly constant, as acceleration due to gravity near the surface of the earth is constant.
Therefore, the answer is:
(c) Its potential energy.
(a) The acceleration for the entire journey of the stone is constant, as acceleration due to gravity near the surface of the earth is constant.
(b) The velocity of the stone at P will be the least. Hence, kinetic energy at this point will be the least.
(c) The stone is at a maximum height at point P. Hence, the potential energy is the maximum at P.
(d) Weight of the stone will remain nearly constant, as acceleration due to gravity near the surface of the earth is constant.
Therefore, the answer is:
(c) Its potential energy.
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Practice more questions from Physics (Lakhmir Singh)
Q1
Question 69:
Which of the following does not posses the ability to do work not because of motion?
(a) a sparrow flying in the sky
(b) a sparrow moving slowly on the ground
(c) a sparrow in the nest on a tree
(d) a squirrel going up a tree
(a) a sparrow flying in the sky
(b) a sparrow moving slowly on the ground
(c) a sparrow in the nest on a tree
(d) a squirrel going up a tree
Q2
Question 70:
A stone is thrown upwards as shown in the diagram. When it reaches P, which of the following has the greatest value of the stone?
Figure
(a) its acceleration
(b) its kinetic energy
(c) its potential energy
(d) its weight
Figure
(a) its acceleration
(b) its kinetic energy
(c) its potential energy
(d) its weight
Q3
Question 71:
A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
View allPractice questions from Physics (Lakhmir Singh)
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| Question Text | Question 70:
A stone is thrown upwards as shown in the diagram. When it reaches P, which of the following has the greatest value of the stone? Figure (a) its acceleration (b) its kinetic energy (c) its potential energy (d) its weight |
| Updated On | Mar 2, 2023 |
| Topic | Work and Energy |
| Subject | Science |
| Class | Class 9 |
| Answer Type | Text solution:1 Video solution: 1 |
| Upvotes | 119 |
| Avg. Video Duration | 4 min |
