Question
Question 29: Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
Found 6 tutors discussing this question
Discuss this question LIVE
11 mins ago
Text solutionVerified
Answer:
The examples of positive, negative and zero work are as follows:
(a) Positive work - When we kick a football, it moves in the direction of the force applied and hence, the work done in this case is positive.
(b) Negative work - Work done by the frictional force on a rolling football to decrease its motion is an example of negative work, as the direction of frictional force (acting on the ball) is opposite to the direction of the football’s motion
(c) Zero work - Work done by the earth on a satellite moving around the earth is zero as the direction of the motion of the satellite is always perpendicular to the direction of the gravitational force.
(a) Positive work - When we kick a football, it moves in the direction of the force applied and hence, the work done in this case is positive.
(b) Negative work - Work done by the frictional force on a rolling football to decrease its motion is an example of negative work, as the direction of frictional force (acting on the ball) is opposite to the direction of the football’s motion
(c) Zero work - Work done by the earth on a satellite moving around the earth is zero as the direction of the motion of the satellite is always perpendicular to the direction of the gravitational force.
Was this solution helpful?
64
Share
Report
One destination to cover all your homework and assignment needs
Learn Practice Revision Succeed
Instant 1:1 help, 24x7
60, 000+ Expert tutors
Textbook solutions
Big idea maths, McGraw-Hill Education etc
Essay review
Get expert feedback on your essay
Schedule classes
High dosage tutoring from Dedicated 3 experts
Practice more questions from Physics (Lakhmir Singh)
Q1
Question 28:
How does the kinetic energy of a moving body depend on its (i) speed, and (ii) mass?
Q2
Question 29:
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
Q3
Question 39:
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
View allPractice questions from Physics (Lakhmir Singh)
Question 1
Views: 5,618
(a) by the stretched rubber strings of a catapult?
(b) by the piece of stone which is thrown away on releasing the stretched rubber strings of catapult?
Figure
Question 2
Views: 5,283
Question 3
Views: 5,330
Practice more questions from Work and Energy
Question 2
Views: 5,191
(a) displacement
(b) angle between force and displacement
(c) force applied
(d) initial velocity of the object
Question 3
Views: 5,662
(a) electrical energy into sound energy in ordinary telephone
(b) microwave energy into sound energy in a mobile phone
(c) sound energy into mechanical energy is a stereo system
(d) sound energy into electrical energy in public address system
Question 4
Views: 5,146
(a) hydroelectric power stations use water to drive turbines
(b) in a power station, turbines drive generators
(c) electricity from thermal power stations differs from that produced in hydroelectric power stations
(d) in hydroelectric power stations and thermal power stations, alternators produce electricity
Practice questions on similar concepts asked by Filo students
Question 1
Views: 5,279
Question 2
Views: 5,518
Question 3
Views: 5,181
Question 4
Views: 5,700
Stuck on the question or explanation?
Connect with our Science tutors online and get step by step solution of this question.
231 students are taking LIVE classes
Question Text | Question 29:
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work. |
Topic | Work and Energy |
Subject | Science |
Class | Class 9 |
Answer Type | Text solution:1 |
Upvotes | 64 |