Effort Arm

Q.

Calculate the effort arm of a lever in which the mechanical advantage is $4$ and the load arm is $90cm$.

1. $360cm$

2. $150cm$

3. $80cm$

4. $140cm$

Q.

A block and tackle system of 5 pulleys consist of 3 pulleys in the upper block and 2 pulleys in the lower block. If the load is raised by 1 m, through what distance will effort move?

1. 3m

2. 5m

3. 7m

4. 1m

Q.

A crowbar of length 120 cm has its fulcrum situated at a distance of 20 cm from the load. Calculate the effort arm and the mechanical advantage of the crowbar.

1. Effort arm = 20 cm, Mechanical advantage = 1.6

2. Effort arm = 30 cm, Mechanical advantage = 1

3. Effort arm = 100 cm, Mechanical advantage = 5

4. Effort arm = 20 cm, Mechanical advantage = 1

Q.

Name the type of single pulley that has a mechanical advantage greater than one.

Q.

A pulley system with$\mathrm{VR}=4$ is used to lift a load of $175\mathrm{kgf}$ through a vertical height of $15\hspace{0.17em}\mathrm{m}$ . The effort required is $50\mathrm{kgf}$ in the downward direction. Calculate
(i) Distance moved by the effort.
(ii) Work done by the effort
(iii) $\mathrm{MA}$ of the pulley system.
(iv) Efficiency of the pulley system.

Q.

If mechanical advantage of a machine is equal to 1 , it is used to change the ________

Q.

A plank of a See-saw is 8m long and is supported at the centre. Rahul, who weighs 80 Kgf sits at a distance of 3 m from the fulcrum. Manish sits 4m from the fulcrum to balance the plank. What is Manish's weight

1. 80 Kg

2. 40 Kg

3. 60 Kg

4. 10 Kg

Q.

If the load arm is 2 m and the effort arm is _______m, then the MA is 3.

Q.

In a machine, a load of 490 N is supported by an effort of 7N. If the distance of fulcrum from the point where the load acts is 10m, find the mechanical Advantage and length of the effort arm.

1. Effort arm = 70m, Mechanical advantage = 6

2. Effort arm = 40m, Mechanical Advantage = 6

3. Effort arm = 70m, Mechanical Advantage = 7

4. Effort arm = 70m, Mechanical Advantage = 10

Q.

A fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf by applying an effort at distance 15 cm from the fulcrum. Find the mechanical advantage of fire tongs.

1. 75

2. 0.75

3. 25

4. 0.25

Q.

A man has to lift a sack of sugar weighing$240N$. If he uses a single fixed pulley, how much effort will he need to apply? What will be the mechanical advantage?

Q.

A force of 5 kgf is required to cut a metal sheet. A pair of shears used for cutting the metal sheet has its blades 5 cm long, while its handles are 10 cm long . What effort is needed to cut the sheet?

1. 2.7 kgf

2. 32.7 kgf

3. 2.5 kgf

4. 132.7 kgf

Q.

An almond nut can be cracked open by a lever of length 1m by applying a force of 100N. If the force is to be reduced to 25 N, what should be the length of the effort arm?

1. 20 m

2. 3 m

3. 4 m

4. 2 m

Q.

What do you understand by mechanical advantage?

Q. A gear system has the driving wheel of radius $2cm$ and driven wheel of radius $20cm$. If the number of rotations made per minute by the driving wheel is $100$, the number of rotations per minute made by the driven wheel will be :

1. $10$
2. $4$
3. $8$
4. $2$

Q.

A lever of length $1.2m$ is pivoted at a distance of $0.4m$ from the load. Calculate the mechanical advantage of the lever.

Q.

If the load arm is _______m and the effort arm is 1.8 m, then the MA is 0.9.

Q.

In a cutting plier, the ___ is longer than the ___.

1. load arm, effort arm

2. width, effort arm

3. effort arm, load arm

4. thickness, load arm

Q.

When the effort arm is greater than the load arm then mechanical advantage is greater than one.

1. True

2. False

Q. The mechanical advantage of a machine is $5$. How much load it can exert for the effort of $2kgf$?