Tag: common machines

Questions Related to common machines

The velocity ratio (VR) for a machine is-

physics a little effort, lot of work motion in application common machines introduction to simple machines

  1. Always constant

  2. Varies with effort (P)

  3. Varies with machine input

  4. Varies with machine output

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Correct Option: A
Explanation:

Velocity ratio of simple machine is the ratio of distance traveled by the effort to the distance traveled by the load in the machine. As velocity ratio or ideal mechanical advantage is a simple ratio of two distances.Hence always remains constant.
Option A is correct.
 

Which of the following is a simple machine?

physics a little effort, lot of work motion in application common machines introduction to simple machines

  1. candle

  2. water

  3. pulley

  4. chair

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Correct Option: C
Explanation:

C. A pulley is the example of simple machine

Which of the following contains only simple machines?

physics a little effort, lot of work motion in application common machines introduction to simple machines

  1. lever, screw, wheel

  2. screw, car, tires

  3. television, computers, levers

  4. lawn mower, edger, leaf blower

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Correct Option: A
Explanation:

A lever, screw and wheel are example of simple machine. 

Rest all are the example of complex machines.

Which part of the lever is the part you are trying to move?

physics a little effort, lot of work motion in application common machines introduction to simple machines

  1. fulcrum

  2. load

  3. effort

  4. none of the above

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Correct Option: C
Explanation:

A force which is applied at one point on the lever in order to move an object is called $effort$ force and hence is the part of lever which we are trying to move. 

Hece, option C is correct

Which simple machine does a flagpole make use of?

physics a little effort, lot of work motion in application common machines introduction to simple machines

  1. lever

  2. screw

  3. pulley

  4. inclined plane

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Correct Option: C

Which simple machine can be used to split a log?

physics a little effort, lot of work motion in application common machines introduction to simple machines

  1. fulcrum

  2. pulley

  3. lever

  4. wedge

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Correct Option: D
Explanation:

D. Wedge is used to split a log. An axe or knife blade is a wedge.

Which simple machine is used to hold objects together?

physics a little effort, lot of work motion in application common machines introduction to simple machines

  1. wedge

  2. scissors

  3. hammer

  4. screw

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Correct Option: D
Explanation:

D. Screw is simple machine which is used to hold to objects together

What should you do to reduce the amount of effort needed to lift something using a first class lever?

physics a little effort, lot of work motion in application common machines introduction to simple machines

  1. move the fulcrum closer to the effort

  2. move the fulcrum to the middle of the lever

  3. move the fulcrum closer to the load

  4. none of the above

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Correct Option: B
Explanation:

Move the fulcrum close to the load to reduce the amount of effort needed to lift something using a first class lever.If, we move the fulcrum towards the effort end, the length of effort arm will reduce and that of load arm will increase, resulting in a lower mechanical advantage and necessitating more effort to do the same amount of work.As a result, the mechanical advantage is more (and less effort would be required).

Option B is correct.

Which part of the lever supplies the force to move something?

physics a little effort, lot of work motion in application common machines introduction to simple machines

  1. fulcrum

  2. load

  3. effort

  4. all of the above

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Correct Option: C
Explanation:

A force which is applied at one point on the lever in order to move an object is called $effort$ force. 

Hence option $C$ is correct. 

Wheel and axle together constitutes a

physics a little effort, lot of work motion in application common machines introduction to simple machines

  1. Simple Machine

  2. Body

  3. Engine

  4. Vehicle

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Correct Option: A