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 27:
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
Q2
Question 28:
How does the kinetic energy of a moving body depend on its (i) speed, and (ii) mass?
Q3
Question 29:
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
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Chapter 5: Sound
162 questions
Question
Question 28: How does the kinetic energy of a moving body depend on its (i) speed, and (ii) mass?
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Text solution
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Answer:
The kinetic energy of a moving body depends on two factors because:
(i) Kinetic energy of a moving body is directly proportional to the square of the speed of the moving body.
(ii) Kinetic energy of a moving body is directly proportional to the mass of the moving body.
(i) Kinetic energy of a moving body is directly proportional to the square of the speed of the moving body.
(ii) Kinetic energy of a moving body is directly proportional to the mass of the moving body.
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Practice more questions from Physics (Lakhmir Singh)
Q1
Question 27:
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
Q2
Question 28:
How does the kinetic energy of a moving body depend on its (i) speed, and (ii) mass?
Q3
Question 29:
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
View allPractice questions from Physics (Lakhmir Singh)
Question 1
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(a) Work is measured as a product of __________ and __________.
(b) The work done on a body moving in a circular path is __________.
(c) 1 joule is the work done when a force of 1 __________ moves an object through a distance of one __________ in the direction of __________.
(d) The ability of a body to do work is called __________. The ability of a body to do work because of its motion is called __________.
(e) The sum of the potential and kinetic energies of a body is called __________ energy.
Question 2
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(a) A stone kept on roof-top
(b) A running car
(c) Water stored in the reservoir of a dam
(d) A compressed spring
(e) A stretched rubber band
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| Question Text | Question 28:
How does the kinetic energy of a moving body depend on its (i) speed, and (ii) mass? |
| Updated On | Dec 23, 2022 |
| Topic | Work and Energy |
| Subject | Science |
| Class | Class 9 |
| Answer Type | Text solution:1 Video solution: 1 |
| Upvotes | 154 |
| Avg. Video Duration | 3 min |
