Advertisements
Advertisements
Question
Classify the following as a lever, a pulley and an inclined plane:
Scissors
Advertisements
Solution
Scissors – A lever
RELATED QUESTIONS
What is an inclined plane?
Fig show a system of four pulleys. The upper two pulleys are fixed and the lower two are movable.

(i) Draw a string around the pulleys. Also show the place and direction in which the effort is applied.
(ii) What is the velocity ratio of the system?
(iii) What is the mechanical advantage of the system?
(iv) What assumption do you make in arriving at your answer in part (iii)?
Comment on the statement ‘The mechanical advantage of a machine is greater than 1’. Give an example of a lever mechanical advantage is:
(i) greater than 1.
(ii) Equal to 1.
What is the relationship between the mechanical advantage and the velocity ratio for:
(i) An ideal machine,
(ii) A practical machine.
Give an example of the following use of a machine to change the direction of force.
A simple machine enables us to lift a load of 10,000 N by the application of an effort of 500 N. However, when the point of application of the effort moves through 2.5 m, the load gets raised through 10 cm only. What are the values of the:
(i) M.A.
(ii) V.R. and
(iii) Efficiency of the machine?
Classify the following as a lever, a pulley and an inclined plane:
A knife
Why is this so traveller’s bags have wheels?
Why is this so machines have to be maintained?
______ help us to make work easier.
