5.5 work, energy, power 🐜

Question 1

define work done

Answer 1

work done by a constant force on an object is defined as the product of the force and its displacement in the direction of the force

Question 2

state the principle of conservation of energy

Answer 2

the principle of conservation of energy states that energy cannot be created or destroyed, but can transferred from one form to another. the total amount in a closed system remains constant

Question 3

state the principle of conservation of mechanical energy

Answer 3

the principle of conservation of momentum states that the total amount of total mechanical energy in a system is conserved in the absence of any net external force

Question 3

define power

Answer 3

power is defined as the work done per unit time

Question 4

define gravitational potential energy

Answer 4

gravitational potential energy is the energy of a mass due to its position in a gravitational field

Question 5

define elastic potential energy

Answer 5

elastic potential energy is the energy stored in an object due to a force compressing or stretching it