Tag: pulleys

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Questions Related to pulleys

Multiple choice physics machines levers and pulleys pulley pulleys

In a pulley:

  1. Wheel is fixed over the axle

  2. Direction of force will not be changed

  3. Mechanical advantage will be more than one

  4. Wheel rotates freely over the axle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A pulley is designed with a wheel that rotates freely on its axle to allow a rope or cable to pass over it smoothly.

Multiple choice physics machines levers and pulleys pulley pulleys

______ is used to pull water from a well.

  1. Pulley

  2. Lever

  3. Gears

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

A pulley is the standard simple machine used to lift water from a well because it allows the user to pull downwards to lift the bucket upwards.

Multiple choice physics machines levers and pulleys pulley pulleys

Velocity ratio of a single movable pulley is

  1. 1

  2. 0

  3. 2

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

$\displaystyle VR=\frac { Distance\quad moved\quad by\quad effort }{ Distance\quad moved\quad by\quad load } $
$\displaystyle MA=\frac { 2Effort }{ Effort } =2$
When effort mved a distance x load moved a distance = x/2
So, 
$\displaystyle VR=\frac { X }{ X12 } =\frac { 2X }{ X } =2$

Multiple choice physics machines levers and pulleys pulley pulleys

Single movable pulley acts as a

  1. speed multiplier

  2. force multiplier

  3. velocity multiplier

  4. all
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Using a single movable pulley, the load can be lifted by applying an effort equal to half the load i.e. single movable pulley acts as a force multiplier.

Multiple choice physics machines levers and pulleys pulley pulleys

Which of the following is not fixed to a rigid support?

  1. Single fixed pulley

  2. Single movable pulley

  3. Double fixed pulley

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

Single fixed pulley is fixed to a rigid support whereas a single movable pulley is not fixed to a rigid support.

Multiple choice physics machines levers and pulleys pulley pulleys

Weight of the pulley ____ the mechanical advantage of single fixed pulley and ____ the mechanical advantage of single movable pulley 

  1. increases, increases

  2. increases, reduces

  3. doesn't affect, reduces

  4. reduces, does not affect
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Weight of pulley does not affect mechanical advantage of single fixed pulley.

Weight of pulley reduces mechanical advantage of single fixed pulley(because it is not stationary).

Multiple choice physics machines levers and pulleys pulley pulleys

In single movable pulley,

  1. Ideal mechanical advantage is 1.

  2. Load moves in the direction of effort

  3. Velocity ratio is 1

  4. All
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In single movable pulley, ideal mechanical advantage is 2. Its velocity ratio is 2. It is used as a force multiplier. Load moves in the direction of effort.

Multiple choice physics machines levers and pulleys pulley pulleys

Pulley whose axis of rotation is not fixed at a position is called

  1. Single fixed pulley

  2. Movable pulley

  3. Both

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

A movable pulley is a pulley allowed to have translational motion.

Multiple choice physics a little effort, lot of work levers and pulleys pulley pulleys

Calculate the effort in newtons required to raise 1000 kg anchor on boat with a wheel and axle of radii 50 cm and 10 cm respectively.

  1. 1000

  2. 1500

  3. 2000

  4. 3000
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The mechanical advantage of a wheel and axle $= \displaystyle \frac{Radius  of  wheel}{Radius  of  the  axle} $      ..........  (1)
But $MA = \displaystyle \frac{load}{effort}$      .............    (2)
From (1) and (2)
$\displaystyle \frac{Radius  of  wheel}{Radius  of  the  axle} = \frac{load}{effort}$
$\displaystyle \frac{50  cm}{10  cm} = \frac{1000 \times  10  N}{effort}$
$Effort = \displaystyle \frac{1000  \times  10  \times 10}{50}$
$ Effort = 2000 N$