Bennett Mechanical Pulleys and Levers Questions and Answers

Question 1

In the pulley system shown, assuming the system is frictionless, what is the minimum force (F) required to lift the 120kg weight?

Accepted Answer

40 kg

Answer

60 kg

Answer

120 kg

Answer

30 kg

Question 2

A wheelbarrow is an example of which class of lever?

Accepted Answer

Second-Class Lever

Answer

First-Class Lever

Answer

Third-Class Lever

Answer

Fourth-Class Lever

Question 3

If person X wants to balance the seesaw, in which direction should they move?

Accepted Answer

Towards A

Answer

Towards B

Answer

They should stay in the same position

Answer

It is impossible to balance

Question 4

Which of the following scenarios provides the greatest mechanical advantage?

Accepted Answer

A single movable pulley attached to the load.

Answer

A single fixed pulley changing the direction of pull.

Answer

Using a pair of tweezers to pick up a small object.

Answer

A fishing rod casting a line.

Question 5

To lift a 200 lb engine out of a car, a mechanic uses a pulley system. If the mechanic can only pull with 50 lbs of force, what is the minimum mechanical advantage the pulley system must have (ignoring friction)?

Accepted Answer

4

Answer

2

Answer

3

Answer

5

Question 6

Using a crowbar to pry open a crate is an application of a first-class lever. Where is the fulcrum located in this action?

Accepted Answer

At the point where the crowbar rests on the edge of the crate.

Answer

At the handle end where force is applied.

Answer

At the point where the crowbar lifts the crate lid.

Answer

In the middle of the crowbar's length.