Hammer
From Wikipedia, a free encyclopedia written in simple English for easy reading.
A hammer is a tool for putting nails into objects such as wood. It has a long handle, and a tip with a flat end for hitting nails. The most common type of hammer (sometimes called a claw hammer) has a curved end (on the other side of the hitting end) for pulling nails out.
Heavy hammers to hit other things, sometimes to break them apart, are often called sledgehammers. Like many tools, hammers are sometimes used as weapons.
In pianos the sound is made by "hammers" which are pieces of wood covered with felt. These hit the strings, making them vibrate.
