Tag: pulley

Questions Related to pulley

In a single movable pulley, if the effort moves by a distance $x$ upwards, by what height is the load raised?

physics machines levers and pulleys pulley pulleys

  1. $x/2$

  2. $x$

  3. $4x$

  4. $2x$

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Correct Option: A
Explanation:
Load $L$ is attached to the movable pulley. A rope is fi xed at a point in ceiling that passes through the moveable pulley. 
In order to lift the effort $E$ by $ x$ meters, the load $L$ needs to 
Travel the distance of $ x/2$ meters. (The entire rope needs to be pulled by $E$ for a distance of $ x$) 
Now, Velocity Ratio equals (Distance traveled by $E$) divided by (Distance traveled by $L$) 
So it becomes : $ x/( x/2)$. This equals to 2
Since it is a ratio. it has no units of measurement. 

What is the velocity ratio of a single movable pulley?

physics machines levers and pulleys pulley pulleys

  1. $1$

  2. $0.5$

  3. $2$

  4. $1.5$

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Correct Option: C
Explanation:

Load $L$ is attached to the movable pulley. A rope is fixed at a point in ceiling that passes through the movable pulley.
In order to lift the load $L$ by $X$ meters, the effort $E$ needs to travel the distance of 2X meters. (The entire rope needs to be pulled by $E$ for a distance of 2X.)
Now, Velocity Ratio equals (Distance traveled by $E$) divided by (Distance traveled by $L$)
So it becomes : $2X/X$. This equals to 2
Since it is a ratio. it has no units of measurement.

Example of wheel and axle is :

physics common machines levers and pulleys pulley pulleys

  1. Egg-beaters

  2. Egg-whiskers

  3. Clocks

  4. Electric saw

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Correct Option: B

Which of these is not an example of a fixed pulley?

physics machines levers and pulleys pulley pulleys

  1. well

  2. Flagoogle

  3. Crane

  4. None of these

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Correct Option: A
Explanation:

Both crane and flagpole comprises of pulley but not well. 

A simple pulley reduces the effort required to lift a heavy load.

physics machines levers and pulleys pulley pulleys

  1. True

  2. False

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Correct Option: A

A pulley makes our work easier by changing the direction of the force.

physics machines levers and pulleys pulley pulleys

  1. True

  2. False

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Correct Option: A

Levers, inclined planes and pulleys are called:

physics common machines levers and pulleys pulley pulleys

  1. Compound machines

  2. Complex machines

  3. Easy machines

  4. Simple machines

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Correct Option: D
Explanation:
  1. A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. Levers,inclined planes and pulleys are called simple machines

A single fixed pulley is equivalent to a :

physics machines levers and pulleys pulley pulleys

  1. first order lever

  2. second order lever

  3. third order lever

  4. complex machine

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Correct Option: A

In a wheel-and-axle :

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

  1. wheel rotates freely on axle

  2. wheel is fixed to the axle

  3. direction of the force remains same'

  4. mechanical advantage is always more than one

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Correct Option: B

In a pulley :

physics machines levers and pulleys pulley pulleys

  1. Load and effort are equal

  2. Load is greater than effort

  3. Load is less than effort

  4. Both have no relation

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Correct Option: A