Tag: introduction to simple machines

Questions Related to introduction to simple machines

The ratio of the work output to the work input of a machine is

physics simple machine common machines terms related to machines introduction to simple machines

  1. mechanical advantage

  2. efficiency

  3. work

  4. power

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Correct Option: B
Explanation:

Efficiency is the (often measurable) ability to avoid wasting materials, energy, efforts, money, and time in doing something or in producing a desired result. In a more general sense, it is the ability to do things well, successfully, and without waste. In more mathematical or scientific terms, it is a measure of the extent to which input is well used for an intended task or function (output).

Which of the following is not considered a simple machine?

physics simple machine common machines terms related to machines introduction to simple machines

  1. Wedge

  2. Pulley

  3. Lever

  4. Wheelbarrow

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Correct Option: D
Explanation:

A wheelbarrow is example 3 class third lever rest all are example of simple machine. hence option D is incorrect

A screwdriver can be used to open a can of paint. In this situation, the screwdriver is being used as a

physics simple machine common machines terms related to machines introduction to simple machines

  1. wheel and axle

  2. screw

  3. lever

  4. inclined plane.

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Correct Option: C
Explanation:

C lever. The edge of the can serves as the fulcrum and the lid is the load.

The ratio of distance travelled by the effort to the distance travelled by the load in the machine is called-

physics simple machine common machines terms related to machines introduction to simple machines

  1. velocity ratio

  2. distance ratio

  3. work ratio

  4. none of these

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Correct Option: A
Explanation:

The velocity ratio is define as $VR=\dfrac{{Effort}{} _{distance}}{{load}{} _{distance}}$
hence option A is correct.

An oar is used to row a boat. The distance between the oar lock (fulcrum) and the rower's hand is $104 cm$. This distance is considered

physics simple machine common machines terms related to machines introduction to simple machines

  1. the effort distance

  2. the resistance distance.

  3. the mechanical advantage of the oar

  4. the effort force

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Correct Option: A
Explanation:

the distance between fulcrum and effort is called effort distance.
Option A is correct

The mechanical advantage of each machine is determined by

physics simple machine common machines terms related to machines introduction to simple machines

  1. adding the mechanical advantage for each simple machine

  2. finding the simple machine with the largest mechanical advantage

  3. finding the average mechanical advantage for the simple machines

  4. multiplying the mechanical advantage for each simple machine

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Correct Option: D
Explanation:

The mechanical advantage of each machine is determined by  multiplying the mechanical advantage for each simple machine.
Option D is correct

The mechanical advantage of another oar is $3.00$. If the resistance force of the water is $35.0\ lb$, what is the effort force exerted by the rower?

physics simple machine common machines terms related to machines introduction to simple machines

  1. 11.7 lb

  2. 0.0857 lb

  3. 105 lb

  4. 32.0 lb

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Correct Option: A
Explanation:

The $effort=\dfrac{MA}{load}=\dfrac{35lb}{3}=11.7lb$

In a lifting machine, an effort of $500$ N is to be moved by a distance of $20$ m to raise a load of $10000$ N by a distance of $0.8$ m. Determine the velocity ratio and mechanical advantage?

physics simple machine common machines terms related to machines introduction to simple machines

  1. 10 and 35

  2. 20 and 35

  3. 10 and 25

  4. 25 and 20

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Correct Option: D
Explanation:
Distance moved by effort is 20m,that of load is 0.8m

$VR=\dfrac{{E}{} _{d}}{{L}{} _{d}}$

$VR=\dfrac{20}{0.8}$

$VR=25$

the load is 10,000N and effort=500N

$MA=\dfrac{{load}{} _{d}}{{effort}{} _{d}}$

$MA=\dfrac{10000}{500}$

$MA=20$

In an ideal machine,

physics simple machine common machines terms related to machines introduction to simple machines

  1. Velocity Ratio > Mechanical Advantage

  2. Velocity Ratio =0.5 X Mechanical Advantage

  3. Velocity Ratio < Mechanical Advantage

  4. Velocity Ratio = Mechanical Advantage

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Correct Option: D
Explanation:

For an ideal machine the Velocity ratio is always equal to Machanical advantage.

$VR=MA$

Hence option D is correct

What load will be lifted by an effort of $12$ $N$ if the velocity ratio is $18$ and the efficiency of the machine at this load is 60%?

physics simple machine common machines terms related to machines introduction to simple machines

  1. 1N

  2. .130N

  3. 1.30N

  4. 13N

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Correct Option: B
Explanation:

$\eta=\dfrac{load}{effort*VR}*100$

$load=\eta*effort*VR=0.6*12*18=130N$