What is an ideal machine ?
When is work said to be done by a force ?
Machines are able to make our work convenient.
Select the correct alternative :
For an ideal machine, the efficiency is
State whether the following statements is True or False.
A boy does work while pushing a wall.
A machine performs work by itself.
Can a machine have an efficiency of 100% ? Give a reason to support your answer.
Name six simple machines. Give an example of each machine.