Tag: introduction to simple machines

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

The law of a certain lifting machine is $P =W/50+ 1.5$. The velocity ratio of the machine is 100. Find the maximum possible mechanical advantage and maximum possible efficiency of the machine

  1. 50 and 50%

  2. 50 and 60%

  3. 60 and 60%

  4. 60 and 50%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The law of the machine is P = W/50 + 1.5. The maximum mechanical advantage is the reciprocal of the coefficient of W, which is 50. Efficiency is (Mechanical Advantage / Velocity Ratio) * 100, so (50/100) * 100 = 50%.

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

When the height of the inclined plane decreases :

  1. the mechanical advantage decreases

  2. the mechanical advantage increases

  3. effort increases

  4. it will not have any effect on the mechanical advantage
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The mechanical advantage of an inclined plane is given by length/height. As the height decreases, the ratio length/height increases, thus increasing the mechanical advantage.