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What is velocity ratio? Explain with formula.

Important Questions on Simple Machine

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Science>Physics>Simple Machine>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>Simple Machine>Velocity Ratio
A block and tackle system has 5 pulleys. If an effort of 1000 N is needed in the downward direction to raise a load of 4500 N, calculate the efficiency of the system.
EASY
Science>Physics>Simple Machine>Velocity Ratio
Mechanical advantage of an inclined plane is always _____.( greater than one, less than one)
HARD
Science>Physics>Simple Machine>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.
EASY
Science>Physics>Simple Machine>Velocity Ratio
Mechanical advantage of a machine defined as
HARD
Science>Physics>Simple Machine>Velocity Ratio

Define the following:
Velocity ratio

EASY
Science>Physics>Simple Machine>Velocity Ratio
Explain the term mechanical advantage of a machine.
EASY
Science>Physics>Simple Machine>Velocity Ratio
How is mechanical advantage related to the velocity ratio for an ideal machine?
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Science>Physics>Simple Machine>Velocity Ratio
A fixed pulley is driven by a 100 kg mass falling at a rate of 8.0 m in 4.0 s. It lifts a load of 75.0 kgf.
(a) Calculate the power input to the pulley taking the force of gravity on 1 kg as 10 N.
(b) the efficiency of the pulley, and the height to which the load is raised in 4.0 s.
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Science>Physics>Simple Machine>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.
MEDIUM
Science>Physics>Simple Machine>Velocity Ratio

Diagram alongside shows a nutcracker with a wooden base. If the effort required to crack the nut is 50 N, find the resistance offered by the nut.

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EASY
Science>Physics>Simple Machine>Velocity Ratio
An inclined plane always has the mechanical advantage more than 1.
MEDIUM
Science>Physics>Simple Machine>Velocity Ratio
Figure below shows a wheelbarrow of mass 15 kg carrying a load of 30 kgf with its centre of gravity at A. The points B and C are the centre of wheel and tip of the handle such that the horizontal distance AB=20 cm and AC=40 cm.
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Calculate: (i) the load arm, (ii) the effort arm, (iii) the mechanical advantage and (iv) the minimum effort required to keep the leg just off the ground.
EASY
Science>Physics>Simple Machine>Velocity Ratio
The mechanical advantage of a lever is equal to :
EASY
Science>Physics>Simple Machine>Velocity Ratio
A woman draws water from a well using a fixed pulley. The mass of bucket and water together is 6 kg. The force applied by the woman is 70 N. Calculate the mechanical advantage. (Take g=10 m s-2).
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Science>Physics>Simple Machine>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.    
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Science>Physics>Simple Machine>Velocity Ratio
An effort of 500 N is applied through a distance of 0.50 m on a machine, whose efficiency is 90% such that resistance is overcome through a distance of 0.04 m. Calculate: -
 (i) velocity ratio,
 (ii) mechanical advantage,
 (iii) resistance overcome by the machine.
EASY
Science>Physics>Simple Machine>Velocity Ratio
A crowbar of length 120 cm has its fulcrum situated at a distance of 20 cm from the load. Calculate the mechanical advantage of the crowbar.
EASY
Science>Physics>Simple Machine>Velocity Ratio
State four ways in which machines are useful to us?
MEDIUM
Science>Physics>Simple Machine>Velocity Ratio
In a block and tackle system consisting of 3 pulleys, a load of 75 kgf is raised with an effort of 25 kgf. Find: (i) the mechanical advantage, (ii) velocity ratio and (iii) efficiency.