were doing simple machines and on my paper it shows a door knob What simple machine is that ( lever,wedge etc.) And my sec que it also shows scissors what simple machine is that?
http://www.edheads.org/activities/simple-machines/glossary.htm
I am also learning about simple machine a doorknob is a wheel-and-axle I do not know about the scissors
Ah, the door knob, a true hero of the household. It falls under the category of a lever. It uses the principle of a lever to make opening and closing doors a breeze. As for the scissors, they are a classic example of a compound machine. They consist of two levers (when we open and close them) and also contain sharp edges for cutting, which make them double trouble!
A doorknob is an example of a lever. Levers are simple machines that involve a rigid bar that pivots around a fixed point called a fulcrum. In the case of a doorknob, the bar (lever) is the handle, the fulcrum is the point where the knob attaches to the door, and applying force to turn the knob allows us to open or close the door.
Scissors, on the other hand, are an example of a compound machine that combines multiple simple machines. Scissors consist of two levers pivoting around a fulcrum, and the sharp blades at the end act as wedges. The levers allow us to control the motion, while the wedges provide the cutting action. So the scissors can be considered as a combination of levers and wedges.
The door knob is an example of a type of simple machine called a lever. A lever is a rigid bar that is allowed to pivot or rotate around a fixed point called a fulcrum. In the case of a door knob, the fulcrum is the axis of rotation where the knob attaches to the door. When you turn the knob, you apply a force to one end of the lever, and that force is used to move the door on the other end.
To determine the type of simple machine, you can think about how the object or device works and what its main function is. In this case, the door knob is used for turning and opening/closing a door, which involves the use of a lever mechanism.
As for the scissors, they are an example of a simple machine called a combination of two wedges. A wedge is a simple machine with a thick end and a thin end, which is used to separate or split objects apart. Scissors have two wedges in the form of blades, which are sharpened at the thin end. When you open and close the scissors, the two wedges come together and create a cutting action.
So, in summary, the door knob is a lever, and the scissors are a combination of two wedges.