Physics
A pulley is used because it :
- has the mechanical advantage greater than one
- has 100% efficiency
- helps to apply the force in a convenient direction
- requires more effort to raise a less load.
Related Questions
Wheel is used with axle because :
- sliding friction is less than the rolling friction
- rolling friction is less than the sliding friction
- they work as the inclined plane
- they help us to change the direction of force.
Fill in the blanks :
(a) The useful work done by an actual machine is always …………… than the work done on the machine.
(b) In class II levers, the …………… is in between fulcrum and …………… .
(c) The mechanical advantage of class …………… lever is always less than 1.
(d) A pulley is used to change …………… .
(e) Mechanical advantage of an inclined plane is always …………… .