Work and Energy — Flashcards
Madhya Pradesh Board · Class 9 · Science
22 flashcards for Work and Energy (Madhya Pradesh Board Class 9 Science) to test yourself on key terms and facts.
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What is the scientific definition of work?
Answer
Work is done when a force acts on an object and the object is displaced in the direction of the force. Work = Force × Displacement (W = F × s). Both conditions must be satisfied: (1) Force must act on…
A person pushes a heavy rock with great force but the rock doesn't move. Is any work done? Why?
Answer
No work is done because there is no displacement of the rock. Even though force is applied, work requires both force AND displacement. Since displacement = 0, work done = Force × 0 = 0 joules.
What is the unit of work and how is it defined?
Answer
The unit of work is joule (J) or newton metre (N m). 1 joule is the amount of work done when a force of 1 newton displaces an object by 1 metre in the direction of the force. 1 J = 1 N × 1 m…
When is work done positive and when is it negative?
Answer
Work is positive when force and displacement are in the same direction (angle = 0°). Work is negative when force and displacement are in opposite directions (angle = 180°). Example: Lifting an object …
Calculate the work done when a force of 10 N displaces an object by 5 m in the direction of force.
Answer
Given: Force (F) = 10 N, Displacement (s) = 5 m Using W = F × s Work done = 10 N × 5 m = 50 N m = 50 J Therefore, work done is 50 joules.
What is energy? How is it related to work?
Answer
Energy is the capacity of an object to do work. An object possessing energy can exert force on another object and cause displacement, thus doing work. Energy is measured in the same unit as work (joul…
List the different forms of energy with examples.
Answer
Forms of energy include: 1. Kinetic energy - moving car, flowing river 2. Potential energy - water in a dam, stretched rubber band 3. Heat energy - hot tea, burning wood 4. Chemical energy - food, pet…
What is kinetic energy? Write its formula.
Answer
Kinetic energy is the energy possessed by an object due to its motion. A moving object can do work, hence it has energy. Formula: KE = ½mv² where m = mass of object, v = velocity of object. Unit is jo…
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