Question

A machine with a velocity ratio of 19 uses an effort of 13 N. What load can be lifted if the efficiency of machine is 60 %? Determine the law of machine if the frictional resistance is constant.​

Answer 1

Question 2: State the principle of machine.

Answer: According to the principle of machine work done by a machine or output work can never be greater than the work done on the machine or input work. In an ideal machine, “the output work of a machine is equal to input work”, is known as principle of a machine.

Question 3: Give an example where a machine is used to obtain gain in speed.

Answer: In automobiles, gear arrangement system (machine) is used to obtain gain in speed.

Question 4: What is the efficiency of an ideal machine?

Answer: The efficiency of an ideal machine is 1 (or 100%).

Question 5: Write an expression to show the relationship between mechanical advantage, velocity ratio and efficiency for a simple machine.

Answer: