A doorknob is considered a wheel and axle because it has a wheel portion, the knob, and an axle, the rod in the door, that turn on the same axis. In instances such as a doorknob, a wheel and axle can also be considered a type of lever.Know More
One common conception of a wheel and axle is as a tool to reduce surface friction to easily roll an object from one place to another. This is the type of wheel-and-axle system used in cars and bicycles. Under this configuration, a force is applied to the object, and the comparatively reduced surface area of the wheel as well as the wheel's size compared to the axle make the object easier to move. A larger wheel generally makes an object easier to roll.
The wheel and axle can be used as a type of lever. A force applied to the outer rim of a wheel creates greater torque on the axle than the same force applied to an axle without a wheel. This is because the wheel functions as a lever to create a mechanical advantage. The larger the wheel, the larger the mechanical advantage, and the easier it is to turn the axle. This is the type of wheel-and-axle system that a doorknob creates.Learn more about Building Materials
To open a locked bedroom door, stick an unfolded paper clip into the hole next to the knob, press it in and turn the knob. If the door remains locked, insert a credit card between the latch and door frame, and wiggle it as you turn the knob. This five-minute procedure requires a paper clip and a credit card.Full Answer >
The main parts of a door lock include the knob, the dead latch, the rose insert, the strike plate and the key. Technically, only the inside of a knob is directly related to the locking mechanism.Full Answer >
The R-value of garage door is its resistance to heat flow. This value is used to denote the thermal efficiency of the door's insulation. Garage doors that possess higher R-values have superior insulation capabilities, as opposed to doors with lower R-values that provide poorer insulation.Full Answer >
Many factors must be considered in calculating the cost of bedroom remodeling, including costs for permits, plumbing and wiring, demolition, materials and labor. In addition, if the remodel moves load-bearing walls or adds to the house's foundation, an architect or engineer may need to be involved.Full Answer >