reference point physics

The Circle of Reference - The above figure shows a body moving with uniform speed along a circle. Let perpendiculars be drawn from different positions of the body onto any diameter, say the vertical diame..

To devise a scale of temperature, fixed reference points (temperature) are required, with respect to which all other temperatures are measured. For both Celsius and Fahrenheit Scales of temperatures, the fixed points are as follo..

Displacement vector is a vector which gives the position of a point with reference to a point other than the origin of the coordinate system. Let a particle at a point P at an instant of time t, move to another point Q at time t l . The position v..

If a reference line on a rigid body rotates through an angle , a point within the body at a position 'r' from the rotation axis moves a distance 's' along a circular arc where 's' is given by ..

Let the object O be viewed with our eyes which is at a distance of r, making an angle q between the two eyes as shown in the diagram. The angle q , caused by the two lines drawn from the position of the two eyes to the object, is called angle of parallax. If we can consider OA and OB as r..

The word force in common usage refers to a push or pull. The word Mass is also just as familiar as the word force. A super tanker is one that contains an enormous amount of mass. In comparison a coin does not contain much mass. During the seventeenth century Newton developed three importa..

) The lasers are used for drilling tiny holes in diamonds for drawing fine wires. (iv) They are used in precision surveying. Because of its high intensity and exceptional directionality, the laser is an excellent tool for surveying. In order to be certain that a bridge or tunnel is being constructe..

One joule is the work done, when the point of application of a force of one Newton moves through a distance of one meter in the direction of force. 1Nm is referred as joule after the British Scientist James Prescott Joule. The letter 'J' denotes Joule. Higher units of wor..

The rays of light parallel to the principal axis of a mirror after reflection, either pass through a point (in the case of a concave mirror) or appear to diverge from a point (in the case of a convex mirror) on the principal axis and this point is referred t..

Rest and Motion - Rest and motion are relative terms. A person sitting in a moving car is at rest with respect to his or her fellow passengers, but is in motion with respect to other objects or people on the road. Moreover, it is not possible to define 'absolute rest' or 'absolute motion'. Absolute..