Tag: introduction to simple machines

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

A coolie uses a sloping wooden plank of length $2.0 m$ to push up a drum of mass $100 kg$ into the truck at a height $1.0 m$. What is the mechanical advantage of the sloping plank ?

  1. 6

  2. 5

  3. 2

  4. 10
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Length of the sloping wooden plank , $l = 2 m$
Vertical height , $h = 1 m$
We, know that for a inclined plane,
Mechanical Advantage $= \dfrac{Length \ of \ the \ incline}{vertical \ height}$
$\Rightarrow \dfrac{l}{h} = \dfrac{2}{1} = 2$

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

A fire tongs has its arms $20cm$ long. It is used to lift a coal of weight $1.5kgf$ by applying an effort at a distance $15cm$ from the fulcrum. Find the mechanical advantage of fire tongs.

  1. $3$

  2. $0.50$

  3. $0.90$

  4. $0.65$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Effort Arm $ = 15 cm$
Load Arm $ = 20 - 15 = 5 cm$
Mechanical Advantage $= \dfrac{\text{Effort Arm}}{\text{Load Arm}} = \dfrac{15}{5} = 3$

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

A fire tongs has its arms $20 \ cm$ long. It is used to lift a coal of weight $1.5 \ kgf$ by applying an effort at a distance $15 \ cm$ from the fulcrum. Find the effort needed.

  1. $0.2 kgf$

  2. $1.5 kgf$

  3. $2.5 kgf$

  4. $2.0 kgf$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$Load= 1.5kgf$
$Load \ arm= 20cm$
$Effort \ arm=15 cm$
$Effort \ = 20 \times 1.5/15= 2.0kgf$
The fulcrum in tongs is the joint end of the arms

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

It is harder to cut an apple with a butter-knife, because:

  1. butter-knife has more inclination

  2. mechanical advantage of a butter-knife is less

  3. it has a high angle of wedge

  4. all the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A butter knife has a blunt edge (high wedge angle), which results in a low mechanical advantage, making it harder to cut compared to a sharp knife.

Multiple choice physics lever 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 iriclination 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

As steps become more inclined, the vertical height gained per step increases, requiring more work against gravity. This reduces the mechanical advantage because a greater portion of the applied force goes into lifting vertically rather than moving forward.

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

For a _________, the mechanical advantage is always less than one.

  1. first order lever

  2. second order lever

  3. third order lever

  4. both A and C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a third-class lever, the effort is applied between the fulcrum and the load. Since the effort arm is always shorter than the load arm, the mechanical advantage is always less than 1.

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

Mechanical advantage of a second order lever is :

  1. always less than one

  2. less than or equal to one

  3. always greater than one

  4. greater than or equal to one
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a second-class lever, the load is between the fulcrum and the effort. This means the effort arm is always longer than the load arm, resulting in a mechanical advantage always greater than 1.