Question

In which of these situations, is mechanical energy being conserved? (Neglect, air resistance, friction and breaking) Check all that apply.

Child on a swing


Pendulum


Bow and Arrow


Roller Coaster

Answer 1

Neglecting, air resistance, friction and breaking, all the condition has conservation of mechanical energy.

Step-by-step explanation:

• The law of conservation of mechanical energy suggests that the mechanical energy in a locked system with out any destructive forces like friction or air resistance remains always the same (constant).
• The energy may be converted between kinetic energy, potential energy, gravitational potential but energy do not get decreased in any cases as mentioned in the option.
• So all the cases mentioned above shows the conservation pattern of mechanical energy.