The Simple Pulley

Q.

A pulley system has 5 pulleys in all and is 90% efficient. If the effort required to lift a load is 1000 N, find the resistance due to the movable parts of machine and friction.

1. 100 N

2. 111.1 N

3. 155.5 N

4. 2000 N

Q.

Which of the following helps us to hold objects together?

1. Inclined plane

2. Screw

3. Pulley

4. Wheel and axle

Q.

What is the use of the lever if its mechanical advantage is (a) more than 1, (b) equal to 1, and (c) less than 1.

Q. Explain briefly on a single fixed pulley. Mention any one of its applications.

Q.

___ is the force applied in order to lift the load.

Q.

Read the following statements carefully.

Statement 1: A lever is a simple machine which is used to lift heavy weights with the minimum amount of effort.
Statement 2: In the inclined plane, there is a slanting surface which connects two points at different heights so that the heavier objects can be moved up or down easily.
Statement 3: A Pulley is used to lift heavy objects by changing the direction of the force.
Statement 4: A screw is a simple machine made of wood or metal with at least one slanting side ending in a sharp or pointed edge.
Which of the following is an incorrect statement? State the reason for your answer.

1. Statement 1

2. Statement 2

3. Statement 3

4. Statement 4

Q.

A nut and bolt is an example of a ____________ (screw / wedge).

Q. A single fixed pulley can be used as a force multiplier.

1. True

2. False

Q.

Calculate the mechanical advantage of a simple machine that can lift a load of $200N$ with an effort of $50N.$

Q. The mechanical advantage of a machine is 2. It is used to raise a load 15 𝑘𝑔𝑓. What effort is needed?

Q. An ideal pulley system can lift a load of 1500 N by an effort of 300 N. The velocity ratio of the system is .

1. $2$
2. $4$
3. $5$

Q.

The ratio between the useful load lifted to the effort applied is called mechanical advantage.

1. True
2. False

Q.

Differentiate between

Inclined plane and screw

Q. A single fixed pulley can change the ______ of the force applied on the load.

1. magnitude
2. direction
3. (a) and (b) above.
4. None of the above

Q.

A boy uses a single fixed pulley to lift a load of 50 kgf to some height. Another boy uses a single movable pulley to lift the same load to the same height. Compare the effort applied by them. Give a reason to support your answer.

Q.

The windings in a screw are called

1. rounds

2. threads

3. spirals

4. none of these

Q. A pulley simplifies work by __________.

1. decreasing the distance moved
2. changing the direction of effort
3. increasing the distance moved
4. transmitting the effort to the load

Q.

To lift up an object, the simple machine that can not be used is:

1. pulley
2. wedge
3. lever
4. inclined plane

Q.

In a lever, the fulcrum is at one end of the lever rod of length 120 cm and the load is at the other end. An effort of 30 N is exerted at a distance of 40 cm from the load.Calculate load value?

Q. A heavy block from the ground can easily be lifted up to a higher floor of a building using:

1. Screw
2. Pulley
3. Inclined plane
4. Wedge

Q.

A single fixed pulley can change ……………… of effort.

Q. Which of the following helps us hold objects together?

Q. An ideal pulley system can lift a load of 1500 N by an effort of 300 N. The velocity ratio of the system is:

1. $3$
2. $2$
3. $5$
4. $6$

Q.

The given figure shows a uniform meter rule of weight W supported on a fulcrum at the 50 cm mark by applying the effort E at the 90 cm mark.

Find the mechanical advantage of the lever.

1. 3

2. 2

3. $\frac{1}{3}$

4. $\frac{2}{3}$

Q.

A handle of a water pump is $90cm$ long from its piston rod. If the pivot of the handle is at a distance of $15cm$ from the piston rod, calculate the least effort required at its other end to overcome a resistance of$60kgf$? and what is the mechanical advantage?

Q.

The load arm and the effort arm of a lever are $32cm$ and $48cm$, respectively. How much load can the lever overcome with an effort of $360kgf?$

Q.

_________ force always opposes the motion of the body.

Q.

Sid wants to split a log. Which one of the following machines would help him?

1. Cutting pliers

2. Scissors

3. Axe

4. Beam balance

Q. Assertion :A crowbar is used to lift heavy loads. Reason: A simple machine can be made as a force multiplier.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Identify the position where effort is applied in the given figure.

1. 
2. 
3.