A nail is actually a type of wedge, which is a simple machine. A wedge is often shaped like a triangle. One point is used to cut or push something…

When a force is applied over a distance, it produces work. It also takes twice as much work to lift the same object twice as far. As indicated by the math, the main benefit of machines is that they allow us to do the same amount of work by applying a smaller amount of force over a greater distance.

Simple machines that are widely used include the wheel and axle, pulley, inclined plane, screw, wedge and lever. While simple machines may magnify or reduce the forces that can be applied to them, they do not change the total amount of work needed to perform the overall task.

2  A compound machine is a machine made of two or more simple machines. The complexity can range from being very simple to very complex. 3  A common example of a domestic compound machine is nail clippers. A nail clipper contains two levers.

Answer: Closed as it can never be an open system for a number of reasons.

why a pencil SHARPENER consists of 2 simple machines: The old fashioned pencil sharpeners that are mounted to the wall and cranked by a handle are an example of a compound machine that consists two simple machines: the wheel and axle and a wedge.

• Best Manual Sharpener: Chef’s Choice by Edgecraft.
• Best Electric Sharpener: Work Sharp Culinary E5.
• Best Sharpening Stone: Sharp Pebble.
• Best Entry-Level Electric Sharpener: Presto EverSharp.
• Best Entry-Level Manual Sharpener: PriorityChef.
• Best Budget-Friendly Sharpener: KitchenIQ Edge Grip.
• Best Quick Fix: Accusharp.

Yes, they do get dull eventually. You throw them away and buy a new pencil sharpener. Sharpening a cylindrical cutter will reduce the diameter and make it impossible for them to mesh into a complete cone. If you want to try it, you will need some kind of turning equipment like a lathe.

The Best Pencils for Writing and Schoolwork

• Our pick. Palomino ForestChoice. A high-quality pencil you can buy in bulk. This pencil is made of premium incense-cedar wood, and it’s one of the smoothest-writing pencils we tested.
• Budget pick. Dixon Ticonderoga (Yellow) Good performance for the price.
• Upgrade pick. Palomino Blackwing 602. The Cadillac of pencils.

The higher the number, the harder the core and lighter the markings. (No. 1 pencils produce darker markings, which are sometimes preferred by people working in publishing.)

The 2B pencil has a higher blackness, and the marks drawn are relatively black, while the HB pencil has a lower blackness, and the color of the marks drawn is relatively light, which is very different. The usage of 2B pencil and HB pencil is also quite different. 2B pencil is darker in color and lower in hardness.

$13,400 Pencil is World’s Most Expensive | American Luxury. Graf von Faber-Castell has crafted a pencil out of cedar wood that features diamonds and white gold, making it the world’s most expensive pencil.

The “Ultimate” pencil, Limited Edition of the Graf von Faber-Castell Perfect Pencil, which is offered at $12,800. Only 10 of this classic pencil is crafted with 240 year-old olive wood and 18-carat white gold, and includes a built-in eraser and sharpener have been made, and there are only about 5 left in the world.

The Graf von Faber-Castell pencil is the world’s most expensive. Behold the brilliant, writing instrument!

Best Colored Pencils

• Cretacolor Mega Colored Pencils (set of 24)
• Derwent Colorsoft Pencils (set of 24)
• Caran D’ache Luminance Colored Pencil (set of 20)
• Chameleon Color Tones Colored Pencils (set of 25)
• Faber-Castell Polychromos Color Pencils (set of 120)
• LYRA Rembrandt Polycolor Art Pencils (set of 100)