simple machines

Simple Machines - In all the above examples, a machine either multiplies or reduces the effect of the force that is applied. A bicycle is a machine which is used to gain speed. We gain speed by exerting additional force. When we try to ride a bicycle up a ste..

A bicycle is a machine which is used to gain speed. We gain speed by exerting additional force. When we try to ride a bicycle up a steep hill, we soon realize that we gain speed by applying greater force. It is impossible to multiply both the force and gain the speed at the same tim..

Before surgeons can perform open-heart surgery or heart transplants or even to correct a simple heart defect, they have to be able to open up the heart and expose the chambers. To enable this, circulation and respiration are maintained by the heart - lung machine. The func..

Summary - Machine is a device that is used to multiply force, or to gain speed, or to change the direction of a force, or transform energy. Levers, pulleys, inclined plane and gears are some of the examples of simple machines..

A simple crowbar can be used to lift a heavy rock with a small effort. The crowbar is an example of a lever. The use of levers was known to the ancient Greeks, and it is reported that Archimedes once remarked "Give me a lever long enough and I will move the world" A lever is a rigid rod c..

Solar energy is responsible for the blowing of wind. The intensity of sun-rays is stronger near the Equator than at the Polar Regions. Due to unequal heating of the earth's surface, cooler air from the Polar Regions flow towards the equatorial regions to fill the space created by the hot rising a..

If the kidneys are so impaired by disease or injury that they are unable to excrete nitrogenous wastes and regulate pH and electrolyte concentration of the plasma, the blood must be filtered by an artificial device. Such filtering of the blood is called Haemodialysis . Haemodialysis in simpleh..

. In a certain simple machine with velocity ratio 5, an effort of 1000 N is needed to overcome a load of 4500 N. Calculate (i) mechanical advantage (ii) efficiency of the machine Suggested answer : V.R = 5 Effort = 1000 N Load = 4500 N (i) M.A (ii) Efficiency 2. A pull..