Question

concept map
rohan and soniya are trying to arrange all the key points they have learnt about work
and energy in the form of a concept map as given below. while performing the task, they
got confused and left a few blank spaces in the concept map. help them complete the
task.
work and energy
work
energy
forms of energy
sources of energy
mechanical energy
examples of
renewable sources
of energy:
_ energy
_ energy
_ energy
_ energy
electrical energy
examples of
non - renewable
sources of energy:
_ energy
_ energy
hydro energy
_ energy
_ energy
work is done when

Explanation:

• Work is done when: There is a force applied on an object and the object moves in the direction of the force. Mathematically, \(W = F\times d\times\cos\theta\) (where \(F\) is force, \(d\) is displacement, and \(\theta\) is the angle between force and displacement). When \(\theta = 0^{\circ}\) (force and displacement in the same direction), \(W = F\times d\).
• Forms of energy (under mechanical energy):
• Potential energy: Energy possessed by an object due to its position (e.g., gravitational potential energy \(U = mgh\), elastic potential energy \(U=\frac{1}{2}kx^{2}\)).
• Kinetic energy: Energy possessed by an object due to its motion (\(K=\frac{1}{2}mv^{2}\)).
• Other forms of energy (general forms):
• Heat (thermal) energy: Related to the motion of particles in a substance.
• Light energy: Electromagnetic radiation that can be seen (e.g., from the sun, light - bulbs).
• Sound energy: Produced by vibrating objects (e.g., sound from a guitar string).
• Nuclear energy: Released during nuclear reactions (fission or fusion).
• Sources of energy:
• Renewable sources: Solar energy (from the sun, harnessed using solar panels), wind energy (using wind turbines), hydro - energy (from flowing water in dams), biomass energy (from organic matter like plants).
• Non - renewable sources: Coal (formed from fossilized plants), petroleum (formed from fossilized marine organisms), natural gas (also a fossil fuel).

Answer:

• Work is done when: A force acts on an object and the object moves in the direction of the force (or \(W = F\times d\times\cos\theta\) with \(\theta\) being the angle between force and displacement and work is non - zero when \(\cos\theta

eq0\)).

• Forms of energy (under mechanical energy):
• Potential
• Kinetic
• Other forms:
• Heat (thermal)
• Light
• Sound
• Nuclear
• Sources of energy:
• Renewable sources: Solar, wind, hydro, biomass.
• Non - renewable sources: Coal, petroleum, natural gas.