Physics
Which feature of the screw determines its mechanical advantage?
- Thread
- Pitch
- Lead
- Interlock
Machines
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Answer
Lead
Reason — The linear distance covered by the screw in one complete turn (360°) is called its lead which determines the mechanical advantage of the screw such that smaller the lead, the higher is the mechanical advantage and vice versa.
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Match the columns.
Column A Column B 1. Fixed support in a lever (a) Door stopper 2. Children's slide (b) Screw driver 3. Fixed pulley (c) Fulcrum 4. Wheel and axle (d) Well 5. Wedge (e) Inclined plane 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%.