Several simple instruments for the measurement of pressure make use of a column of liquid. A mercury barometer consisting of a tube of glass, about 1m long, closed at the upper end and open at the lower end. The tube is filled with mercury, except for a small empty space at the top. The bottom … Read more
When a force is applied on a body, rather than moving in uniform velocity, its velocity might increase or decrease with time and in this case, either the value or direction can change or both can change. Again, acceleration is the rate of change of velocity with time. Because if a body moves in uniform … Read more
The human heart beats about 70 times per minute. Each beat begins with a contraction of the atria which is followed a moment later by the contraction of the muscle. The contractions of the heart muscle, like the contractions of other muscles, are triggered by electric signals. But in contrast to other muscles, where the … Read more
Let us have two metallic balls. One of them is strongly charged and the other one is electrically neutral. If we now join them with iron wire or by metallic substance, then the neutral metallic ball will gain charge. Now if we touch them all with a wooden stick or rubber, then the neutral ball still remains neutral or … Read more
Particles that exert electric forces are said to have electric charge particles that do not exert electric forces are said to have no electric charge. Thus, electric charge is thought of as the source of electric force, just as mass is the source of gravitational force. Electrons and protons have an electric charge, but neutrons have no electric … Read more
Electric force Our society is dependent on electricity. An electric power failure demonstrates our dependence on electricity. Electricity is an essential ingredient in all the atoms in our bodies and in our environment. The forces that hold the parts of an atom together are electric forces. Furthermore, so are the forces that bind atoms in … Read more
What is static friction? The frictional force that develops when two objects are at rest relative to each other is called static friction. Static friction is the friction between two surfaces that aren’t moving relatively to each other. When a force is applied to an object, but it does not cause it to move then … Read more
The effect of the smoothness of the road is observed on the motion of the car. For example, when driving on a rough road, the grooves of a car’s type come in contact with the uneven parts of the road. As a result, frictional force occurs. This makes it easier for the car to move … Read more