Tag: machines

Questions Related to machines

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.

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

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 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

In a pulley:

physics machines levers and pulleys pulley pulleys

  1. wheel is fixed over the axle

  2. effort is greater than the load

  3. mechanical advantage will be more than one

  4. wheel rotates freely over the axle

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Correct Option: D

A single fixed pulley is

physics machines levers and pulleys pulley pulleys

  1. A machine that only changes the direction of the force applied, not the amount

  2. A machine that only changes the amount of force not direction

  3. Both

  4. None

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Correct Option: A
Explanation:

A single fixed pulley is a machine that only changes the direction of the force applied, not the amount.
The wheel of a fixed pulley does not move because the wheel is attached to some support.

A single pulley is 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