#1
What is mechanical advantage in a simple machine?
The ratio of output force to input force
ExplanationMechanical advantage represents how much a machine multiplies force.
#2
Which of the following simple machines has a mechanical advantage equal to 1?
Inclined plane
ExplanationAn inclined plane provides no mechanical advantage.
#3
What is the formula to calculate mechanical advantage of a simple machine?
MA = output force / input force
ExplanationMechanical Advantage (MA) is calculated by dividing output force by input force.
#4
A pulley system with four supporting ropes has a mechanical advantage of:
4
ExplanationThe number of supporting ropes in a pulley system determines its mechanical advantage.
#5
Which of the following simple machines is an example of a first-class lever?
Nutcracker
ExplanationIn a first-class lever, the fulcrum lies between the effort and the load.
#6
What happens to mechanical advantage when friction is present in a simple machine?
It decreases
ExplanationFriction reduces the effectiveness of force multiplication, lowering mechanical advantage.
#7
What is the mechanical advantage of an ideal pulley system with no friction?
2
ExplanationAn ideal pulley system doubles the input force, providing a mechanical advantage of 2.
#8
What is the efficiency of a simple machine?
The ratio of work output to work input, expressed as a percentage
ExplanationEfficiency measures how well a machine converts input energy into useful output.
#9
Which of the following simple machines has a mechanical advantage that varies with the distance from the fulcrum?
Lever
ExplanationThe mechanical advantage of a lever depends on the position of the load and effort relative to the fulcrum.
#10
What is the ideal mechanical advantage of a machine?
The mechanical advantage measured in an ideal situation with no friction
ExplanationIdeal mechanical advantage represents the maximum possible force multiplication of a machine.
#11
Which of the following is an example of a compound machine?
Pulley system
ExplanationA compound machine combines two or more simple machines to perform work.
#12
What is the formula for calculating efficiency of a machine?
Efficiency = (work output / work input) * 100%
ExplanationEfficiency is calculated by dividing work output by work input and multiplying by 100%.