# Introducing Motion in Straight Line class 11th Part 1: Mind Maps, One-Shots, and Formulas!

In physics, one of the most important topics is motion. Everything in the universe is in motion. Moving might be extremely slow and may only involve a small amount, but the movement is occurring. The Earth moves around the sun and the sun moves around our galaxy, even when you appear to be standing still. When an object’s position changes with time, it is said to be in motion.

As a relative concept, motion can involve the movement of a body, which may also be at rest concerning another reference system. On the doubt-solving website, we provide you with easy-to-understand notes along with illustrations of concepts, practical mind maps, and hacks that you can apply in your daily life.

• How does motion in a straight line work?

Objects that change their position concerning their surroundings over time are described as in motion. An object is in motion when its position changes over time. The motion of a line is nothing more than linear motion. Due to its name, the line uses only one dimension since it is in the form of a straight line.

• Linear motion types

The linear motion also referred to as Rectilinear Motion, can be classified as:

1. Moving in a straight line at constant velocity or zero acceleration
2. Variable velocity and non-zero acceleration in non-uniform linear motion

Among all the one-dimensional motion types, linear motion is the most straightforward. Newton’s first law of motion states that as long as no external force is applied to the object, it will remain stationary or continue to move straight forward with a uniform velocity.

# It is recommended that you do not confuse linear motion with general motion. Linear motion has only one dimension, as we discussed earlier. However, motion generally has both magnitude and direction, i.e. the position and velocity of an object are described using vector quantities.

• A straight line of uniform motion

An object is said to be uniformly moving if it travels in a straight line and covers an equal distance in the same time interval. If the rate of change of a body’s velocity remains constant, it is said to be experiencing uniform acceleration.

Example:

A car traveling at 60 km/hour will cover one kilometer per minute. The acceleration of the car is thus uniform.

• Motion in a straight line that is non-uniform

When a body’s velocity changes slightly in equal intervals of time, it is said to have non-uniform motion. This is because its velocity changes at different points during its movement, which is unlike uniform acceleration.

Example:

During a football kick, a boy changes direction. The distance might be covered in four meters on the first attempt, six meters on the second change, nine meters on the third change, and so on, depending on the velocity of the boy.

• Formulas for straight-line motion