Find Out How Much Your Coins Are Worth

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The most frequent question asked by collectors is, “what are my coins worth?” It’s one of the most fundamental coin-related inquiries we receive at the Professional Numismatists Guild.

As part of our broad commitment to education about coins, it’s our pleasure to help you determine the value of your coins. In partnership with Numismatic Guaranty Corporation, we provide an incredibly useful tool – the NGC Price Guides.

If your coins are in good condition, they could possibly be worth a sizeable amount of money. Just click the links below and you can find out the market value of any U.S. or World coin, including yours.

The Price Guides are simple to use. Just follow these easy steps:

Click Here to Access the NGC U.S. Coin Price Guide

Click Here to Access the NGC World Coin Price Guide

• Click on the denomination of your coin. For example, Nickels:

• Click on the date range your coin falls under. In this case, the nickel is a 1930, so it’s within the 1913-1938 date range.

• The 1930 nickel shown has no mintmark, so once you arrive at the Buffalo Five Cents (1913-1938) page, scroll down to 1930.

Across the menu bar at the top of the page, you’ll notice the grades you can reference, beginning to the right of the eBay link.

Along with rarity, the coin’s grade (condition) is the key factor in determining its value. In the example, a 1930 Nickel with a grade of MS-63 is currently worth about $75.

(Note that the prices shown are forcomparison only and neither NGC nor PNG is bound to their accuracy.)

Coins are graded on a scale of 1 to 70, 70 being a perfectly struck coin with no wear. That’s what the grading numbers on the coin page’s menu bar refer to. [Visit the Grading Scale topic under Coin Grading on the NGC website for an explanation of what the grades mean.]

• If your coin is not in really good condition, it will likely not grade at 55 or higher. You can click on the $ sign button (upper right) to get a wider range of grades. Once you click on the dollar sign button, you will see a full range of grades in the menu bar to the right of the eBay link:

Unless your coin is in really good or uncirculated condition, the chances are it fits into one of these lower grades and corresponding price ranges.

• When you have finished looking up your coin’s price, just click the Return to PNGdealers.org link at the top left to return to the PNG site.

What if you’re fortunate enough to have a coin that is rare and sought-after by collectors?

Some coins, such as the 1937-D 3-Leg Buffalo Nickel [pictured to the right]are quite valuable, even in low grades. If you find a coin like this, you should do two things:

1)Give a PNG member dealer a call and discuss what you have.

2) Unless the dealer tells you otherwise, have the coin graded and authenticated by NGC. Having coins graded and certified can increase their value, in some cases dramatically.

For more detailed information about a coin and its history, you can click on any applicable link on the Price Guides.

There is a wealth of information about how and why coins are graded on the NGC website. Pay particular attention to the Grading Scale topic.

You can also visit NGC’s Coin Grading Guide (under Resources) for more information on how to assign your coin a ballpark grade.

Once you have a general idea of how coin grading works, using the Price Guides to get a general idea of what you have is a snap!

Free-Falling Objects

Free fall is the motion of a body where its weight is the only force acting on an object.

Learning Objectives

Solve basic problems concerning free fall and distinguish it from other kinds of motion

Key Takeaways

Key Points

• The acceleration of free-falling objects is called the acceleration due to gravity, since objects are pulled towards the center of the earth.
• The acceleration due to gravity is constant on the surface of the Earth and has the value of 9.80 [latex]displaystyle frac{text{m}}{text{s}^2}[/latex].

Key Terms

• acceleration: The amount by which a speed or velocity changes within a certain period of time (and so a scalar quantity or a vector quantity).

Free Fall

The motion of falling objects is the simplest and most common example of motion with changing velocity. If a coin and a piece of paper are simultaneously dropped side by side, the paper takes much longer to hit the ground. However, if you crumple the paper into a compact ball and drop the items again, it will look like both the coin and the paper hit the floor simultaneously. This is because the amount of force acting on an object is a function of not only its mass, but also area. Free fall is the motion of a body where its weight is the only force acting on an object.

Free Fall: This clip shows an object in free fall.

Galileo also observed this phenomena and realized that it disagreed with the Aristotle principle that heavier items fall more quickly. Galileo then hypothesized that there is an upward force exerted by air in addition to the downward force of gravity. If air resistance and friction are negligible, then in a given location (because gravity changes with location), all objects fall toward the center of Earth with the same constant acceleration, independent of their mass, that constant acceleration is gravity. Air resistance opposes the motion of an object through the air, while friction opposes motion between objects and the medium through which they are traveling. The acceleration of free-falling objects is referred to as the acceleration due to gravity [latex]text{g}[/latex]. As we said earlier, gravity varies depending on location and altitude on Earth (or any other planet), but the average acceleration due to gravity on Earth is 9.8 [latex]displaystyle frac{text{m}}{text{s}^2}[/latex]^. This value is also often expressed as a negative acceleration in mathematical calculations due to the downward direction of gravity.

Equations

The best way to see the basic features of motion involving gravity is to start by considering straight up and down motion with no air resistance or friction. This means that if the object is dropped, we know the initial velocity is zero. Once the object is in motion, the object is in free-fall. Under these circumstances, the motion is one-dimensional and has constant acceleration, [latex]text{g}[/latex]. The kinematic equations for objects experiencing free fall are:

Coin Falls Game

[latex]text{v}=text{v}_0-text{gt}text{y}=text{y}_0+text{v}_0text{t}-frac12text{gt}^2text{v}^2=text{v}_0^2-2text{g}(text{y}-text{y}_0),[/latex]

where [latex]text{v} = text{velocity}[/latex], [latex]text{g}=text{gravity}[/latex], [latex]text{t}=text{time}[/latex], and [latex]text{y}=text{vertical displacement}[/latex].

Coin Falls Behind Train

Free Fall Motion – YouTube: Describes how to calculate the time for an object to fall if given the height and the height that an object fell if given the time to fall.

Examples

Some examples of objects that are in free fall include:

Coin Falls Through Cracks

• A spacecraft in continuous orbit. The free fall would end once the propulsion devices turned on.
• An stone dropped down an empty well.
• An object, in projectile motion, on its descent.