Tag: lever

Questions Related to lever

It is difficult to climb the steps having greater inclination. Why?

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

  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

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Correct Option: C

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

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

  1. first order lever

  2. second order lever

  3. third order lever

  4. both A and C

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Correct Option: C

Mechanical advantage of a second order lever is :

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

  1. always less than one

  2. less than or equal to one

  3. always greater than one

  4. greater than or equal to one

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Correct Option: C

If the threads of a screw are closer : 

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

  1. Mechanical advantage decreases

  2. Inclination increases

  3. Effort required will be less

  4. All of the above

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Correct Option: D

The force applied on the machine to overcome the load is called

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

  1. Mechanical advantage

  2. Load

  3. Effort

  4. All of the above 

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Correct Option: C
Explanation:

Definition of effort $\left( \varepsilon \right)$. The resistive or opposing force to be overcome by a machine is called the load $\left(L\right)$.

The resistive or opposing force to be overcome by a machine is called the

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

  1. Load

  2. Effort

  3. Mechanical advantage

  4. All

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Correct Option: A
Explanation:

Definition of load. The force applied on the machine to overcome the load is called effort $\left(\varepsilon \right)$.

When the same amount of force is applied :

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

  1. A nail travels more distance than a screw into the wood board

  2. Screw travels more distance than the nail

  3. Both pierce the wood board to equal distance

  4. None of the above

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Correct Option: B

A boy can exert a maximum force of $10$kg, i.e he cannot lift vertically a load of mass more than $10$kg. Now if he wants to raise a load of mass $20$kg on to a high eall, he can do it with the help of an inclined place making an angle $\theta$ with the horizontal. Find $\theta$.

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

  1. $60^o$

  2. $80^o$

  3. $30^o$

  4. $20^o$

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Correct Option: C
Explanation:

$sin \theta=\dfrac{1}{M.A}=\dfrac{Effort}{Load}=\dfrac{10}{20}=\dfrac{1}{2}$
Thus, by placing a wooden plank at $\theta=30^o$ an angle equal to $30^o$ with the horizontal group can push the load of mass $20$Kg at any height by exerting a force(or effort) of $10$kg.

The velocity ratio of a machine is 1 if 

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

  1. The displacement of load is equal to the displacement of effort

  2. The displacement of load > equal to the displacement of effort

  3. The displacement of load < equal to the displacement of effort

  4. None of the above 

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Correct Option: A
Explanation:

The velocity ratio of a machine is equal to the displacement of effort such a machine changes the direction of effort.

As the closeness of threading increases in a screw :

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

  1. mechanical advantage decreases

  2. effort required will be less

  3. inclination increases

  4. all the above

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Correct Option: B