Tag: simple machine

Quizzes (4) Questions (49)

Questions Related to simple machine

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

It is difficult to climb the steps having greater inclination. Why?

  1. Less erect steps require less energy

  2. Greater inclination requires less effort because of the high mechanical advantage

  3. Greater inclination requires more effort because of the low mechanical advantage

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A steeper incline (greater inclination) effectively acts as a shorter inclined plane for a given horizontal distance, which reduces the mechanical advantage. Consequently, more effort is required to climb it.

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

A pulley system of VR of 2 and efficiency of 50%. If the effort moves through a distance of 5m. Calculate the distance moved by the load.

  1. 2m

  2. 5.6m

  3. 10m

  4. 2.5m
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Given:  $VR=2$


From the relation $VR=\dfrac{\text{Distance moved by effort}}{\text{distance moved by load}}$


Using formula we get distance moved by the load is $2.5m$

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

........ is defined as the ratio of the distance moved by effort and load, in the same time interval.

  1. Velocity ratio

  2. Mechanical advantage

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Velocity ratio = $\displaystyle \frac { Distance\quad moved\quad by\quad the\quad effort }{ Corresponding\quad distane\quad moved\quad by\quad the\quad load } $
It only depends on the design of machine and is always same for a particular machine.

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

Efficiency is

  1. $\displaystyle \frac { Energy\quad input }{ Energy\quad output } \times 100$

  2. $\displaystyle \frac { mechanical\quad advantage }{ velocity\quad ratio } \times 100$

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As no machine is perfectly efficient.
So, we define efficiency as efficiency = $\displaystyle \frac { Energy\quad input }{ Energy\quad output } \times 100$
Also Efficiency = $\displaystyle \frac { mechanical\quad advantage }{ velocity\quad ratio } \times 100$
A petrol engine is about 30% efficient, a diesel engine is 40% efficient.