Scissors is which class lever

By this means you are reducing the effort required, this is what first class levers do best. Other examples of first class levers are pliers, scissors, a crow bar, a claw hammer, a see-saw and a weighing balance. In summary, in a first class lever the effort force moves over a large distance to move the load a smaller distance, and the fulcrum is between the effort force and the load.

As the ratio of effort force arm length to load arm length increases the mechanical advantage of a first class lever increases. Archimedes referred to a first class lever in his famous quote "Give me one firm spot on which to rest a fulcrum and I will move the Earth".

Second class lever In second class levers the load is between the effort force and the fulcrum. A common example is a wheelbarrow where the effort moves a large distance to lift a heavy load, with the axle and wheel as the fulcrum. In a second class lever the effort moves over a large distance to raise the load a small distance. As the ratio of effort force arm length to load arm length increases, the mechanical advantage of a second class lever increases.

In a wheelbarrow, the closer the load is to the wheel, the greater the mechanical advantage. Nutcrackers are also an example of a second class lever. All classes of levers have four basic parts: Beam- The lever, a wooden plank or metal bar resting on the fulcrum. Fulcrum- the pivot or the turning point. Force- the effort or input needed to move the beam and load. Load- the item or object being moved or lifted on the plank. The closer the Load is to the Fulcrum, the easier it is to lift increased mechanical advantage.

Examples include see-saws, crow bars, hammer claws, scissors, pliers, and boat oars. The claw end of a hammer, along with the handle, is a Class 1 Lever. A wheelchair ramp has become a necessary inclined plane in all of society. A slide is another example of an inclined plane. Stairs are inclined planes.

A lever is a simple machine made of a rigid beam and a fulcrum. The effort input force and load output force are applied to either end of the beam.

The fulcrum is the point on which the beam pivots. Levers rely on torque for their operation. The simple machines are the inclined plane , lever , wedge , wheel and axle , pulley , and screw. Six simple machines for transforming energy into work. With a long lever , you can exert a lot of leverage.

When you use an axe or a wrench, the long handle helps to magnify the force you can apply. The weeder is a class -1 lever , while the wrench is a class -2 lever these terms are explained immediately below. Spend a moment to emphasize that the pliers have two levers , one for each handle and attached jaw. A wheelbarrow represents a second class levers. The effort is applied at the end of the handle by the gardener.

The fulcrum is at the wheel — at the opposite end of the handle. The oar is a second class lever with the water as the fulcrum, the oarlock as the load, and the rower as the force, force being applied to the oarlock by exertion of pressure against the water. An oar is an unusual lever since the mechanical advantage is less than one. First- and second-class levers generally are very efficient, especially when the loads are located close to the fulcrum while efforts are further from the fulcrum Figures A and C.