Physics
Answer
| S. No. | Fixed pulley | Movable pulley |
|---|---|---|
| 1. | In a fixed pulley, the pulley is attached to a hook or a wall and doesn't move. | A movable pulley moves with the load. |
| 2. | It changes the direction of the force, but does not amplify it. | It amplifies the force and acts as a force multiplier. |
| 3. | The mechanical advantage of a fixed pulley is equal to 1. | The mechanical advantage of a fixed pulley is greater than 1. |
| 4. | Example: well and flagpole. | Example: cranes and block and tackle pulley in sailing boats. |
Related Questions
Give reasons for the following statements.
(a) Work done by a standing man is zero.
(b) A simple machine neither provides energy nor does any work.
(c) Mechanical advantage of class II lever is always greater than 1.
(d) Effort depends on the steepness of inclined plane.
(e) Efficiency of a machine cannot be 100%.
Differentiate between class I, class II and class III lever. Give examples if applicable.
Differentiate between inclined plane and screw. Give examples if applicable.
What are simple machines? Give examples.