EASY
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Mechanical advantage of a machine is equal to the product of its and velocity ratio. 

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Important Questions on Machines

HARD
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio

Draw a diagram to show a block and tackle pulley system having a velocity ratio of 3 marking the direction of load (L), effort (E) and tension (T).

The pulley system drawn lifts a load of 150 N when an effort of 60 N is applied. Find its mechanical advantage. Is the above pulley system an ideal machine or not?

MEDIUM
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio

Draw a diagram of a block and tackle system of pulleys having a V.R. of 5. In your diagram, indicate clearly the points of application of load and effort.

EASY
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio

What is the relation between mechanical advantage and velocity ratio for an ideal machine.

HARD
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
Calculate the M.A. of a machine which can overcome a resistance of 500 N through a distance of 0.12 m, when an effort of 100 N acts through a distance of 0.72 m.
MEDIUM
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
Obtain the relation between mechanical advantage, velocity ratio and efficiency of a machine.
HARD
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio

In a movable pulley, the load is 100 N. The mechanical advantage, effort applied and V.R respectively, if the efficiency is 100 percentage are:

EASY
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
A system of pulleys consists of three fixed and two movable pulleys. If efficiency of the system is 70% what is its velocity ratio?
HARD
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
A pulley system has 5 pulleys in all and is 90% efficient.Calculate: -
(i) The mechanical advantage,
(ii) The effort to lift a body of 1000 N,
(iii) The resistance due to the movable parts of the machine and friction.
HARD
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
A crowbar of length 120 cm has its fulcrum situated at a distance 20 cm from the load. Calculated the M.A.
HARD
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
Calculate velocity ratio of a machine which can overcome a resistance of 500 N through a distance of 0.12 m, when an effort of 100 N acts through a distance of 0.72 m.
HARD
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
A pulley system has 5 pulleys in all and is 90% efficient. Calculate: -
(i) The mechanical advantage,
(ii) The effort to lift a body of 1000 N.
HARD
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
A block and tackle system of pulleys consists of 8 pulleys. A load of 1000 kgf is lifted by an effort of 250 kgf, efficiency is :
MEDIUM
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
For an ideal machine, select the correct relation between mechanical advantage(MA) and velocity ratio(VR).
EASY
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio

What is the relation between mechanical advantage and velocity ratio for practical machine?

HARD
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
In block and tackle system, a load of 7.5 kgf is raised with an effort of 2.5 kgf. If there are 4 pulleys in the system, find mechanical advantage, velocity ratio and efficiency.    
HARD
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
A weight of 500 Kg was moved through a distance of 7cm by an effort of 20 Kg which moves through a distance of 650 cm, mechanical advantage and velocity ratio of machine are (M.A,V.R)
EASY
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
How is mechanical advantage related to the velocity ratio for an ideal machine?
HARD
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
Calculate: -
(i) velocity ratio,
(ii) mechanical advantage,
(iii) percentage efficiency of machine which can overcome a resistance of 500 N through a distance of 0.12 m, when an effort of 100 N acts through a distance of 0.72 m.
HARD
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
An effort of 10 kgf is applied on a machine through a displacement of 105 cm, when a load of 200 kgf moves through a distance of 5 cm. Calculate efficiency of the machine. 
HARD
Science>Physics>Machines>Relation between Efficiency, Mechanical Advantage and Velocity Ratio
A simple machine is used to displace a load of 400 N through 50 cm by an effort of 100 N. If the efficiency of the machine is 80%, then the mechanical advantage and velocity ratio of the machine are: (MA,VR)