WebAns. (a) Suma pushes water in backward direction and the displacement is in forward direction, work is said to be done. W = −ve (c) Force Displacement of water W = +ve (d) No displacement, hence no work is done (e) Work is done (f ) No displacement, hence no work is done. (g) Work is done Q2. WebApr 12, 2024 · Access NCERT Answers for Class 9 Science Chapter 11 – Work and energy Intext Exercise 1 1. A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (Fig. 11.3). Let us take it that the force acts on the object through displacement. What is the work done in this case? Ans: In the above question it is given that:
CBSE Notes Class 9 Science Work and Energy - AglaSem Schools
WebQuestion of Class 9-Work : Physics class 9th physics notes of chapter Work, power and energy subtopics- Work,In our day to day life, the word work means any kind of mental and physical activity. Work is said to be done when a force displaces a body through certain distance in the direction of force WebMar 30, 2024 · What is SI Unit of Energy. Energy is measured in Joule (denoted by J) Note. SI unit of Work and Energy are Same. Both are measured in Joule (denoted by J) This is because Energy required to do 1 Joule of Work is called 1 Joule Energy. Sometimes, energy is also measured in Kilojoules. 1 Kilojoule = 1000 Joules. or. how to sleep tt at night
Work and Energy Class 9 - Notes, NCERT Solutions, Numericals
WebWork, Power and Energy of Class 9 Let us understand the concept of energy with some examples. When a fast moving cricket ball hits a stationary wicket, the wicket is thrown away. An object when raised to a certain height gets the capability to do work. WebDec 5, 2024 · 10. Positive, Zero and Negative Work done 1. The work done is positive if the force acts on a body in the direction of its motion. W = Fs cosθ W = Fs cos0º W = Fs (cos0º = 1) 2. The work done is zero if the force acts on a body in the direction perpendicular to its motion. W = Fs cosθ W = Fs cos90º W = 0 (cos90º = 0) 3. WebApr 8, 2024 · Chapter 9 - Force and Laws of Motion: These notes explain the concept of force, its effects, balanced and unbalanced force, laws of motion, and Newton’s laws of motion. It further offers a detailed explanation of mass and inertia, momentum and mass, its unit along with numerical problems for practice. how to sleep warm camping