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Motion Class-5

Velocity is defined as the displacement of a body per unit time and is a vector quantity that includes both speed and direction. Speed is a scalar quantity representing the distance traveled in unit time, while average speed can be calculated based on varying speeds during a journey. A body exhibits uniform velocity when it covers equal distances in equal time intervals, and uniform acceleration occurs when its velocity increases by equal amounts over equal time intervals.

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204 views10 pages

Motion Class-5

Velocity is defined as the displacement of a body per unit time and is a vector quantity that includes both speed and direction. Speed is a scalar quantity representing the distance traveled in unit time, while average speed can be calculated based on varying speeds during a journey. A body exhibits uniform velocity when it covers equal distances in equal time intervals, and uniform acceleration occurs when its velocity increases by equal amounts over equal time intervals.

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haragame3
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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•The rate of motion of a body is more meaningful

if we specify its direction of motion along with


speed.
•The quantity which specifies both the direction
of motion and speed is called velocity.
Velocity of a body is the displacement of the
body per unit time.

Since velocity has both magnitude and


direction, it is a vector quantity.
Average velocity

Note: Speed and velocity have the same units


m/s or ms -1
Distinguish between speed and velocity.
Speed Velocity
1.Speed of a body is the 1.Velocity of a body is
distance travelled by the displacement of the
the body in unit time. body per unit time.

2.Speed is a scalar 2.Velocity is a vector


Quantity quantity
3.SI unit of speed is m/s 3.SI unit of velocity is
m/s
1.During first half of a journey by a body it travel with
a speed of40 km/hr and in the next half it travels with
a speed of 20 km/hr. Calculate the average speed of the
whole journey.

Speed during first half (v1) = 40 km/hr


Speed during second half (v2) = 20 km/hr
•A body is said to be moving with uniform
velocity if it covers equal distances in equal
intervals of time in a specified direction.
•A body is said to be moving with non uniform
velocity if it covers unequal distances in equal
intervals of time and vice-versa in a specified
direction or if it changes the direction of motion.
•The velocity of a body can be changed in two
ways first by changing the speed of the body and
second by changing the direction of motion of the
body by keeping the speed constant. Also both
speed and direction of the body can be varied in
order to change the velocity of the body.
•A body has uniform acceleration if it travels in
a straight line and its velocity increases by equal
amount in equal intervals of time.
• for example: Freely falling object,
•Motion of ball rolling down the inclined plane
etc.

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