# What Do You Know About Law Of Lever And Pulley?

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Law of lever and pulley should be fun if you are science incline, won’t be boring to a non-science incline person either; it will expose you to what lever and pulley is really. You think you can score up to 80%?

• 1.

### The law of lever was proven by Archimedes using?

• A.

Geometric reasoning

• B.

Regression

• C.

Osmosis

• D.

All of the above

A. Geometric reasoning
Explanation
Archimedes proved the law of lever using geometric reasoning. This means that he used mathematical principles and geometric concepts to understand and demonstrate the law of lever. He likely used geometric diagrams and calculations to analyze the relationship between the position of the fulcrum, the effort applied, and the load being lifted, leading to his discovery and proof of the law of lever.

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• 2.

### The ratio of the output force to the input force is the mechanical advantage of the?

• A.

Lever

• B.

Machine

• C.

Pulley

• D.

None of the above

A. Lever
Explanation
The mechanical advantage of a lever is determined by the ratio of the output force to the input force. A lever is a simple machine that consists of a rigid bar or beam that pivots on a fixed point called a fulcrum. By applying a force on one end of the lever, a larger force can be exerted on the other end. The mechanical advantage of a lever depends on the position of the fulcrum and the lengths of the lever arms on either side of it. Therefore, the correct answer is Lever.

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• 3.

### The word ‘lever’ entered English about 1300 from Old?

• A.

Greek

• B.

French

• C.

Spanish

• D.

Levier

B. French
Explanation
The word 'lever' entered English about 1300 from Old French. This suggests that the word was borrowed from the French language and incorporated into English.

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• 4.

### The earliest remaining writings regarding levers date from the 3rd century BCE and were provided by?

• A.

Plato

• B.

Da Vinci

• C.

Archimedes

• D.

None of the above

C. Archimedes
Explanation
Archimedes is the correct answer because he is known for his contributions to the field of mechanics, including his work on levers. The writings from the 3rd century BCE that are mentioned in the question are likely referring to Archimedes' work on levers, which is considered to be some of the earliest recorded information on the subject. Both Plato and Da Vinci were influential figures in their respective fields, but they are not specifically known for their writings on levers. Therefore, the correct answer is Archimedes.

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• 5.

### A lever is a beam connected to ground by a hinge, or pivot called a?

• A.

Bolt

• B.

Inertia

• C.

Fulcrum

• D.

None of the above

C. Fulcrum
Explanation
A lever is a simple machine that consists of a beam or a rigid bar that is connected to a fixed point called a fulcrum. The fulcrum acts as a pivot point around which the lever rotates. It provides support and allows the lever to move. In this case, the correct answer is fulcrum because it is the term used to describe the pivot point or hinge that connects the lever to the ground.

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• 6.

### The ideal lever does not dissipate or store energy, which means there is no friction in the?

• A.

Hinge

• B.

Bending

• C.

Beam

• D.

All of the above

D. All of the above
Explanation
An ideal lever does not dissipate or store energy, which means there is no friction in any of the mentioned options: hinge, bending, or beam.

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• 7.

### The mechanical advantage of a lever can be determined by considering the balance of?

• A.

Moments

• B.

Torque

• C.

Level

• D.

A and B only

D. A and B only
Explanation
The mechanical advantage of a lever can be determined by considering the balance of moments and torque. Moments refer to the turning effect produced by a force about a pivot point, while torque is the measure of the force's ability to rotate an object. By analyzing the balance of these two factors, one can calculate the mechanical advantage of a lever. The level mentioned in the options is not relevant to determining the mechanical advantage of a lever.

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• 8.

### Levers are classified by the relative positions of the?

• A.

Fulcrum

• B.

Regression

• C.

• D.

None of the above

A. Fulcrum
Explanation
Levers are classified by the relative positions of the fulcrum. The fulcrum is the fixed point around which the lever rotates or pivots. The position of the fulcrum in relation to the load and effort determines the type and effectiveness of the lever.

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• 9.

### The lever is a movable bar that pivots on a fulcrum attached to a fixed?

• A.

Point

• B.

End

• C.

Path

• D.

All of the above

A. Point
Explanation
A lever is a movable bar that pivots on a fulcrum, which is attached to a fixed point. The fixed point, also known as the fulcrum, is the point around which the lever rotates. This allows the lever to exert force or lift objects by applying effort at one end while the load is at the other end. Therefore, the correct answer is "Point".

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• 10.

### The use of velocity in the static analysis of a lever is an application of the principle of?

• A.

Virtual work

• B.

Fulcrum

• C.

Level

• D.

None of the above

A. Virtual work
Explanation
The use of velocity in the static analysis of a lever is an application of the principle of virtual work. Virtual work is a concept in mechanics that states that the work done by external forces on a system in equilibrium is equal to zero. In the case of a lever, the velocity of the lever is used to calculate the forces and moments acting on it, and by applying the principle of virtual work, the equilibrium conditions of the lever can be determined.

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