PHYSICS [1 Mark Question Answer]

The motion of a body along a circular path is called circular motion.
Example : A girl is whirling a stone tied at the end of a string in a circular path.

Rotatory motion - A body is said to be in a rotatory motion or a circular motion if it moves about a fixed axis without changing the radius of its motion.
Examples: The blades of a fan, a spinning wheel.

Curvilinear motion - If the motion of a body is along a curved path, it is said to be the curvilinear motion.
For example, the motion of a cycle while taking a turn on the road, a car moving along a curved path, a ball thrown by an athlete are in curvilinear motion.

Rectilinear motion - If the motion of a body is along a straight line, it is said to be the rectilinear or linear motion. The motion of bullet fired from a gun. 

A person sitting in a compartment of a moving train is at rest . relative to the other person sitting by his side and is in motion relative to the platform.

A person walking in a compartment of a stationary train is in motion relative to the compartment and is in motion relative to the platform.

Mass is the quantity of matter contained in a body. Weight is the force with which the earth attracts the body. Weight is always directed vertically downwards.

The mass of a body is constant and it does not change by changing the position of the body.

1 kg F = 10 N .

The weight of a body is the force with which earth attracts the body i.e. the weight of a body is the force of gravity on it. The weight of a body is not constant, but it changes from place to place. It is represented by the symbol W. The S.I. unit of weight is newton (N).

In a non-uniform motion, the average speed of a body is calculated by dividing the total distance travelled by the body, with the total time of its journey. Thus,
Average speed = Total distance travelled by the body / Total time of joumey 

Mixed = Translatory and Oscillatory motion.

Mixed = Translatory and Rotatory motion

Rotatory motion.

Periodic motion.

Rotatory motion.

Rotatory motion, circular motion and periodic motion

Uniform circular and periodic motion.

Non-periodic motion

Oscillatory motion, periodic motion

Rotatory motion

Rectilinear motion

Random motion - When an object in motion has no specific path and which suddenly changes its motion is said to have a random motion.
Example: A flying kite.

In vibratory motion, a part of the body always remains fixed and the rest part moves to and fro about its mean position. During the vibratory motion, the shape and size of the body changes. Example : When we breath, our chest expands and contracts. This motion is vibratory motion.

Oscillatory motion - The to and fro motion of a simple pendulum is an oscillatory motion.
Example: 1. The motion of a swing, 2. Piston of an engine.

Rest - A body is said to be at rest if it does not change its position with respect to its immediate surroundings.
Motion - A body is said to be in motion if it changes its position with respect to its immediate surroundings.