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## Physics – Motion – Full Notes

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## Rest And Motion

• Motion: An object is said to be in motion when its position changes with time.
• Rest: An object is said to be at rest when its position does not change with respect to a reference point with time.
• A specific point with respect to which we describe the location of an object is called a reference point.
• The terms Rest and Motion are relative.

## Distance and Displacement

• Distance: The total length of path covered by an object is said to be the distance travelled by it.
• Displacement: The length of a straight path that joins the initial and final positions of an object is known as the displacement.

# Speed

• Speed: The distance travelled by an object in unit time is referred to as speed.
• Its S.I unit is m/s.
• In general speed refers to average speed.
• Average speed: For non-uniform motion, the average speed of an object is obtained by dividing the total distance travelled by an object by the total time taken.

## .

• For a uniform motion, the average speed of an object is equal to its instantaneous speed throughout the path.

# Velocity

• Velocity: For a uniform motion in a straight path, the average velocity is equal to its instantaneous velocity throughout the path.

## • Velocity of an object is equal to the instantaneous velocity of an object.

# Uniform And Non-Uniform motion

• Uniform motion or non accelerated motion: When an object covers equal distances in equal intervals of time, it is said to be in uniform motion. Uniform motion is a non-accelerated motion.
• Non-uniform motion or accelerated motion: Motions where objects cover unequal distances in equal intervals of time. Uniform motion is an accelerated motion.

# Graphical representation of motions

## (ii) The equation for position-time relation:   ## Conclusions From a Distance – Time Graph

# Uniform Circular Motion

## When a body moves in a circular path with uniform speed, its motion is called uniform circular motion.

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