Physics
Solve the following numericals.
(a) What is the mechanical advantage of a machine that lifts a load of 100 N with an effort of 20 N?
(b) What is the effort required if the mechanical advantage is 9 and the load is 81 N?
Related Questions
Give two more examples of ramps or slopes that make work easier.
Identify the types of lever in the given simple machines.
Some of the facts that you have learnt till now are listed below. Tick (✓) the facts that are correct and cross (x) the facts that are incorrect.
(a) Efficiency of a machine can be 100%.
(b) A wheel and axle move together.
(c) A wedge is a combination of an axle and inclined plane.
(d) Screw acts as a fastener.
(e) Screwdriver is an example of screw.
Fill in the blanks.
(a) The ratio of the load lifted by a machine to the effort applied on it is called …………… .
(b) Work done on an object is the product of …………… and …………… .
(c) There are three types of levers based on the positions of ……………, …………… and …………… .
(d) The ratio of work done by a machine to the work done on the machine is termed as …………… of the machine.
(e) The arrangement of several pulleys to pick heavy loads is called …………… .