Kamali engages in reading books, drawing diagrams, organizing her thoughts, collecting question papers, attending classes, discussing problems with her friends, and performing experiments.
Tiwari Academy Discussion Latest Questions
In common parlance, Kamali’s preparation for exams would be described as ‘working hard.’
According to the scientific definition of work, Kamali’s preparation for her examinations may involve very little ‘work.’
The everyday use of the term ‘work’ refers to any effort or activity that expends energy, while the scientific definition of work involves a force causing a displacement in the direction of the force.
Living beings need energy to perform life processes and other activities, while machines need energy to operate and perform tasks.
Both living beings and machines need energy to perform various activities and functions.
Some engines require fuel like petrol and diesel because they convert the chemical energy in the fuel into mechanical energy to perform work.
Humans use animals to lift weights, carry loads, pull carts, and plough fields.
Animals engage in activities such as jumping, running, fighting, moving away from enemies, finding food, and finding safe places to live, all of which require energy.
Activities that are more strenuous require more energy compared to less strenuous activities.