Test: Motion & Measurement of Distances

The standard unit of length in SI system is metre.

Measuring tape is used by a tailor to measure the length of cloth.

One centimetre (cm) is equal to:

► 10 mm
► 10^-2m
► 10^-5km

• Oscillatory motion takes place when the restoring force acting on the body is directly proportional to its displacement from its equilibrium position. In practice, oscillatory motion eventually comes to rest due to damping or frictional forces.
• Non-periodic motion: The motion which does not repeat itself after a regular interval of time is called non-periodic motion. Examples: A footballer running on a field, application of brakes in a moving vehicle, a ball rolling the ground gradually slows down finally stops, the motion of tides in the sea, etc.
• A type of motion in which all parts of the body move the same distance in a given time is known as translatory motion. Translatory motion can be of two types: rectilinear and curvilinear.
• The movements of the earth around the sun are an example of periodic motion as it is completed in a fixed interval of time.

The distance between Delhi and Kanpur is usually expressed in kilometre.

Time of sunrise is a point of time while a day, a minute and a second represent a period of time or time interval.

One kilometre is equal to 1000 meter.

Hectare is the unit of area which is equal to 10000 meter square.

Girah, Cubit and Angul are ancient unit of measurement while meter is SI unit of measurement.

Change in position of a body with time is called motion.