Energy consepts

Question 1

conservation of energy

Answer 1

closed system with no external forces energy in system is same before an after event. Energy does not need to be in same form

Question 2

efficiency

Answer 2

ratio of useful energy output to total energy supplied

Question 3

GPE

Answer 3

gravitational potential energy. Energy obtained by object when raised by a height in gravitational field

Question 4

kinetic energy

Answer 4

energy in moving objects. Directly proportional to mass of object and square of its velocity

Question 5

power

Answer 5

rate of transfer of energy

Question 6

work done

Answer 6

energy transferred by a force moving over distance. Equal to product of magnitudes of force and distance