Tag: a little effort, lot of work

Quizzes (2) Questions (46)

Questions Related to a little effort, lot of work

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$

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

Two crowbars of lengths 5 m and 7 m are used to lift a boulder, using a small stone, as a fulcrum. Does it affect the effort required to lift the load?

  1. Yes

  2. No

  3. Maybe

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

Yes it effects the effort required to lift the load as a crow bar of 7 m length provides greater effort arm than a crow bar of 5 m length. Thus crow bar of 7 m length requires lesser effort.

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

The machine used to separate the massive particles and light particles from a mixture is

  1. At wood machine

  2. Centrifugation

  3. Filter paper

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

Centrifugation is the process of separating suspended particles from a liquid by rotating the liquid at a high speed. The mixture is taken in a closed bottle and rotated at a high speed. The heavy particles settle at the bottom while light particles remain behind. This method is used to separate cream from milk

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

By using a wheel-and-axle arrangement,you can:

  1. magnify the speed

  2. magnify force

  3. effort can be moved through a greater distance by attaching a handle

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

A wheel-and-axle can be used to magnify force (if input is on the wheel), increase speed (if input is on the axle), or provide mechanical advantage through handle length.

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

A car steering is an example of :

  1. first order lever

  2. second order lever

  3. complex machine

  4. wheel-and-axle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A car steering wheel is a classic example of a wheel-and-axle, where the large wheel provides mechanical advantage to turn the smaller steering column (axle).

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

By using a wheel-and-axle arrangement,you can :

  1. Magnify the speed

  2. Magnify movement

  3. Effort can be moved through a greater distance by attaching a handle

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

A wheel and axle is a simple machine that can be used to increase speed, increase force, or change the distance over which effort is applied. Since all these are valid functions of the arrangement, the all-of-the-above option is correct.