Tag: simple machine

Questions Related to simple machine

Mechanical advantage of an inclined plane is 

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

  1. Always smaller than $1$

  2. Always greater than $1$

  3. Always equal to $1$

  4. All

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Correct Option: B
Explanation:

An inclined plane is a sloping surface that behaves like a simple machine whose mechanical advantage is always greater than $1$.

Akhil has to lift a load of $800N$ onto a platform of $2m$ height. Instead, he pushes the load up a ramp $4m$ long. Find the force required to lift the load vertically up.

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

  1. $200N$

  2. $600N$

  3. $400N$

  4. $800N$

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Correct Option: D
Explanation:

The vertical force is the gravitational force means weight of the load. 

According to question, the weight of load is $mg=800 N$, this will be the required force to lift the load vertically.  

Mechanical advantage =________.

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

  1. Load $-$ effort

  2. Load $\times $ effrot

  3. Load $/$ effort

  4. None of the above

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Correct Option: C

Which of the following statements is NOT correct?

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

  1. In a first order lever, the fulcrum is placed between the effort and the load

  2. The mechanical advantage of a second class levers is greater than $1$ as load is situated in between to effort and fulcrum.

  3. An inclined plane in a hospital, helps pushing a wheel chair easily.

  4. A crow bar is an example of second class lever

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Correct Option: D

Mechanical advantage of wheel and axle is: ($R=$ radius of the wheel, $r$ = radius of the axle)

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

  1. $R+r$

  2. $R/r$

  3. $r/R$

  4. $R-r$

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Correct Option: B
Explanation:

Mechanical advantage is the amplification in force due to the use of a machine . The mechanical advantage of wheel and axle is given by 

                  $M.A.=R/r$

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