Q1
What is Mechanical Advantage?
ALoad/Effort
BEffort/Load
CLoad×Effort
DLoad+Effort
ICSEClass 10 (ICSE)PhysicsCh 3 · Topic 2
Practice and Revision - Machines
Let us practise and revise what we learned about machines. Simple machines like levers, pulleys, and inclined planes make work easier by cha
Core concept
Mechanical advantage (MA) is the ratio of load to effort (MA = Load/Effort), showing how much a machine multiplies force.
How it works
Velocity ratio (VR) is the ratio of the effort's distance moved to the load's distance moved, showing the machine's geometry.
Why it matters
Efficiency of a machine is (MA/VR) × 100%, always less than 100% due to friction and other energy losses.
Key detail
Common simple machines include levers (classified by fulcrum, load, effort positions), pulleys (fixed and movable), and inclined planes.
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Quick notes
• Mechanical Advantage (MA) = Load/Effort.
• Velocity Ratio (VR) = effort distance/load distance.
• Efficiency = (MA/VR) × 100%.
• Efficiency is always less than 100%.
• This is due to friction and energy losses.
• Levers classified by fulcrum/load/effort positions.
• Pulleys can be fixed or movable.
• Inclined planes are also simple machines.