Mechanical Advantage

Q.

Define the terms ‘work input’ and ‘work output’ about the machine.

Q.

Calculate the mechanical advantage for a load of 40 N, when the required force to lift the load is 15 N.

1. 0.7

2. 1.7

3. 2.7

4. 2.07

Q. Name the class of lever to which a nut cracker belongs

Q.

If the mechanical advantage of a simple machine is 4, then the

1. efficiency is 4%

2. work output is 4 times the input

3. output force is 4 times the effort

4. effort is 4 times the output force

Q. When the effort arm is equal to the load arm, the mechanical advantage of the lever is .

1. equal to one
2. Greater than one
3. Less than one

Q. Name the class of lever to which a pair of pliers belongs

Q. Name the class of lever to which an oar rowing of boat belongs.

Q. Name the machine to which the sugar tongs belongs.

Q. Which class of lever has the mechanical advantage always more than 1? Give an example.

Q. Name the machine to which the door knob belongs.

Q.

The output energy of real-life machines is always less than the input energy. Give two reasons for this deficiency.

Q. Name the class of lever to which a beam balance belongs.

Q. Which class of lever has the mechanical advantage always less than 1? Give an example.

Q.

Mechanical advantage (M. A), load (L) and effort (E) are related as :

(a) M.A = L $\times$ E (b) M.A. $\times$ E = L

(c) E= M.A. $\times$ L (d) none of these.

Q. What is an inclined plane? What is its mechanical advantage? Give two examples where it is used.

Q. Draw a diagram to illustrate the positions of fulcrum, load and effort, for a beam balance.

Q. What do you mean by the mechanical advantage of a lever?

Q.

Mechanical Advantage is equal to

1. $\frac{Effort}{Load}$

2. $\frac{Load}{Effort}$

3. $Load+Effort$

4. $Load\times Effort$

Q. What effect can a force have on a stationary body?

Q. How can you increase the mechanical advantage of a lever?

Q. What effect can a force produce on a body which is not allowed to move ?

Q.

State the effect produced by a force in the following case:
$\bullet$ The sling of a rubber catapult is stretched.

Q.

A machine requires an effort of $15kgf$ for a load of $40kgf$. Find its mechanical advantage.

1. $2.7$

2. $2.07$

3. $0.7$

4. $1.7$

Q.

The ratio of Load to effort is a reciprocal of mechanical advantage.

1. False

2. True

Q.

The physical quantities such as mechanical advantage and efficiency of the machine have no unit but are pure numbers. Explain.

Q. Name the class of lever to which a pair of scissor belongs.

Q.

An effort of $120kgf$ is applied on a machine for movement of a load of $360kgf$. The mechanical advantage of the machine is $5$.

1. False

2. True

Q.

The distance between Hyderabad and Delhi is $1674.9$ km by rail how would you express this in centimeters? Also, express this in the scientific form.

Q.

Mechanical advantage of a machine is $4$. It is used to raise a load of $30kgf$. What is the effort needed?

1. $8kgf$

2. $7.5kgf$

3. $10kgf$

4. $4kgf$

Q. A force of 10N raised a load of 400 kg. Calculate mechanical advantage of the machine.

1. 50
2. 10
3. 400
4. 4000