A lever is a simple machine that is made up of a board or bar that rests on an object. Levers are used to achieve a mechanical advantage, such as making lifting heavy objects easier.Know More
Levers consist of three principal parts. The fulcrum is a solid board or rod that can pivot. The force is the physical effort applied to one end of the lever to make it move. The load is the item that is moved.
There are three types of levers. Each type, or class, of lever depends upon where the force, fulcrum and load are located. In a first-class lever, the fulcrum is located between the force and the load. An example of a first-class lever is a see saw. Scissors and pliers are double first-class levers. A second-class lever has the load located between the fulcrum and the force. A wheelbarrow is an example of a second-class lever. A third-class lever such as a fishing pole has the force between the fulcrum and the load.
Levers provide a mechanical advantage by increasing the force applied to an object or by increasing the distance an object is moved. The speed at which an object moves can also be increased by using a lever.Learn more about Motion & Mechanics
The pulley is an effective mechanism that allows the user to lift or drag an object without overexerting. Making a simple pulley system requires just a few basic steps. To construct this system, you will need a basic pulley, screws or nails, a hammer or a drill and the item that will be inserted through the pulley. This item could be rope, wire or string, depending on the weight of the object being moved.Full Answer >
Newton’s second law states that the force acting on an object is directly related to the acceleration. The law is formulated as F = m x a, where F = force, a = acceleration and m = mass of the object in motion. In terms of Atwood’s machine, a force equal to the difference in the suspended weights accelerates the total mass, m1+ m2.Full Answer >
A seesaw is a simple machine that falls into the lever category. A lever is a long bar or stick that one pushes or pulls against a fulcrum to move something.Full Answer >
The zipper is a wedge, which is a simple machine that works by putting two inclined planes side by side so that they create a sharp edge. A zipper has two lower wedges that permit it to close and a single upper wedge that allows it to open.Full Answer >