Energy, Work & Pressure

Question 1

energy

Answer 1

the capacity or ability of a body to do work is called energy.

Question 2

types of energy

Answer 2

mechanical, kinetic, potential, chemical, sound , light, electricity, heat magnetic and nuclear energy.

Question 3

define mechanical, kinetic, potential, chemical, sound , light, electricity, heat magnetic and nuclear energy.

Answer 3

• mechanical energy is the energy possessed by a body due to its stateof motion of position.
• kinetic energy is the energy possessed by a body by the virtue of its motion is called kinetic energy.
  formula: 1/2 mv^2
• potential energy of a body is defined as the energy possessed by virtue of the position or configuration (change in shape and size). formula: mgh
• energy stored in a matter is called chemical energy.
• sound energy is the form of energy ehivh is produced due to the vibration of a material medium.
• light is a doem of energy which makes things visible.
  electrical energy is produced due to continuous flow of electrons.
• the energy which gives the senstation of warmth is called heat energy.
• the enrgy obtained from a magnet is called magnetic energy.
• the energy obtained from a nucleus of a atom is called nuclear energy.

Question 4

work done

Answer 4

work done is definrd as the product of force and displacement. formula: force*displacement

Question 5

what does work done depends on

Answer 5

force and distance covered in the direction

Question 6

one joule work

Answer 6

when one newton force displaces a body through a distance od one metre, the work done is called one joule.

Question 7

work done against fiction

Answer 7

the work done by pushing or pulling an objet on a surface is called work done against fiction

Question 8

work done against gravity (formula)

Answer 8

the work done by lifting a body vertically upward from the earth’s surface is called work done against gravity.

Question 9

transformation of energy

Answer 9

the process in which one form of energy is converted into another is called transformation of energy. formula: mgh

Question 10

power

Answer 10

power is the rate of doing work. formula: work done/ time taken.

Question 11

one watt power

Answer 11

one watt power is the rate of doing ne joule work in a time of one second.

Question 12

relation between energy work and power

Answer 12

a person can’t do a work without energy. the food we eat changes from chemical energy to muscular energy. the muscular energy is used to do various types of work. work is the effect of energy. power is the rate of transformation of energy. two people doing the same work can have different powers. thus, work, energy and power are interrelated.