The law of conservation of angular momentum states that if no external force acts on an object, then its angular momentum does not change. true or false

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

True or false: the revolution of the earth creates day and night as it rotates around the sun

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.