Tag: common machines

Quizzes (4) Questions (140)

Questions Related to common machines

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

The velocity ratio (VR) for a machine is-

  1. Always constant

  2. Varies with effort (P)

  3. Varies with machine input

  4. Varies with machine output
Reveal answer Fill a bubble to check yourself
A Correct answer
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.
 

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.