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Rest: An object is said to be at rest if it does not change its position with time in relation to its surroundings.Motion: An object is said to be in motion if it changes its position with time with respect to its surroundings.Translatory motion: The motion of an object in which every point of the object moves through the same distance in the same interval of time.Rectilinear motion: The motion of an object along a straight line.Curvilinear motion: The motion of an object along a curved line.Circulatory motion: The motion of an object about a fixed central point along the circumference of a circle.Rotatory motion: The motion of a body about a fixed axis.Oscillatory motion: The to and fro motion of a body about its mean position.Vibratory motion: The motion of the parts of a body about its mean position.Periodic motion: The motion which repeats itself at fixed intervals of time.Simple pendulum: An arrangement that consists of a small heavy mass suspended by a weightless, inextensible, and perfectly flexible string from a rigid support.Bob: The small heavy mass suspended in a simple pendulum.Oscillation: One complete to and fro motion of a pendulum about its mean position.Time period: The time taken by a pendulum to complete one oscillation.Non-periodic motion: The motion which does not repeat itself at fixed intervals of time.Complex motion (or Multiple motion): The motion which is a combination of two or more types of motion.Rolling motion: The motion which is a combination of rotatory and translatory motion.Random motion: The motion in which an object changes its direction frequently.Distance: The actual length of the path covered by a moving object irrespective of the direction in which it moves.Speed: The distance travelled by an object per unit time.Speedometer: The device that displays the speed of a moving vehicle.Odometer: The device that displays the distance in kilometres travelled by a vehicle.Uniform motion: The motion of an object when it covers equal distances in equal intervals of time.Non-uniform motion: The motion of an object when it covers unequal distances in equal intervals of time.Uniform speed: The speed of an object when it covers equal distances in equal intervals of time.Non-uniform speed: The speed of an object when it covers unequal distances in equal intervals of time.Average speed: The total distance travelled by an object divided by the total time taken.Light year: The distance travelled by light in one year, used as a unit for astronomical distances.Mass: The quantity of matter a body contains.Weight: The force with which the Earth attracts a body towards its centre.Kilogram force (kgf): The force with which a body of mass 1 kg is attracted towards the Earth.Newton (N): The SI unit of weight, which is the amount of gravitational force acting on a mass of approximately 100 g on the surface of the Earth.
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Chapter: 02. Motion
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