This document discusses circular motion and its two types: uniform and non-uniform. Uniform circular motion describes an object moving in a circle at a constant speed, with the velocity vector always tangent to the circular path. An example given is keeping a car's speed steady around a curve. Non-uniform circular motion involves a changing velocity magnitude, as when a car's speedometer reading changes during a turn. For an object to undergo circular motion, a force must be exerted towards the center of the circle.

1. PHYSICS
PROJECT

4. TYPES OF MOTION
:-

8. WHAT IS CIRCULAR MOTION ?
In physics, circular motion is a movement of an object
along the circumference of a circle or rotation along a
circular path. It can be uniform, with constant angular
rate of rotation (and constant speed), or non-uniform
with a changing rate of rotation. The rotation around
a fixed axis of a three-dimensional body involves
circular motion of its parts. The equations of motion
describe the movement of the center of mass of a
body. Examples of circular motion include: an artificial
satellite orbiting the Earth at constant height. A stone
which is tied to a rope and is being swung in circles, a
car turning through a curve in a race track.

9. An electron moving perpendicular to a uniform
magnetic field, and a gear turning inside a
mechanism.

10. TYPES OF CIRCULAR MOTION
There are two types of circular motion :-
 Uniform circular motion :-Uniform circular motion
can be described as the motion of an object in a
circle at a constant speed. As an object moves in a
circle, it is constantly changing its direction. At all
instances, the object is moving tangent to the
circle. Since the direction of the velocity vector is
the same as the direction of the object's motion,
the velocity vector is directed tangent to the circle
as well. The animation in the next depicts this by
means of a vector arrow.

15.  Your speedometer tells you the magnitude of your
car's velocity vector, so when you go around a curve
while keeping your speedometer needle steady, you
are executing uniform circular motion. If your
speedometer reading is changing as you turn, your
circular motion is non-uniform. Uniform circular
motion is simpler to analyze mathematically, so we
will attack it first and then pass to the non-uniform
case.

16. VOCABULARY
• uniform circular motion — circular motion in which
the magnitude of the velocity vector remains
constant
• Non-uniform circular motion — circular motion in
which the magnitude of the velocity vector
changes

17. Summary
• If an object is to have circular motion, a force must be
exerted on it toward the center of the circle. There is
no outward force on the object; the illusion of an
outward force comes from our experiences in which
our point of view was rotating,

18. A PRESENTATION BY
-VASUDHA ARORA
-IX-B
-38