Uniform Circular Motion

Author:Sunil Batra
9th CBSE
IMPORTANT

Uniform Circular Motion: Overview

This topic deals with uniform circular motion of the body having constant speed using different examples and figures for a better understanding of the circular motions of any kind of the paths.

Important Questions on Uniform Circular Motion

EASY
IMPORTANT

Give example of a motion in which speed of a body remains constant but the body is in accelerated motion.

EASY
IMPORTANT

_____ (speed/force) remains constant in uniform circular motion.

MEDIUM
IMPORTANT

A particle is executing uniform circular motion in a path of radius 3 m with a frequency of 1 revolution per minute. By how much does the total distance travelled by the particle in 70 seconds exceed the magnitude of its displacement over the same time interval?

MEDIUM
IMPORTANT

The angular velocity of earth's rotation on its geographical axis is

EASY
IMPORTANT

A body is travelling at a constant speed in a circle. It has

HARD
IMPORTANT

A stone is attached to a string 2 m long and whirled round in horizontal circle. It completes one rotation in one second. The angular velocity and linear speed of the stone is

EASY
IMPORTANT

A body moves in a uniform circular motion,

EASY
IMPORTANT

Name a motion where an object does not change its speed but its direction of motion changes continuously. Calculate the speed of tip of second hand of watch of length 1.5 cm.

MEDIUM
IMPORTANT

"The direction in which an object moves is given by the direction of velocity of the object and not by the acceleration." Give an example to justify this statement.

EASY
IMPORTANT

If the acceleration of the particle is constant in magnitude but not in direction, what type of path does the particle follow?

EASY
IMPORTANT

Can a body have acceleration in one direction and velocity in another direction?

EASY
IMPORTANT

_____ provides the required centripetal force in planetary motion. (Gravitational force / Nuclear force / Electrostatic force)

MEDIUM
IMPORTANT

Uniform circular motion is a case of accelerated motion.

EASY
IMPORTANT

When a body is moving with constant speed in a circular path, its acceleration is zero.

EASY
IMPORTANT

Can a body moving with a constant speed have accelerated motion?

EASY
IMPORTANT

A cyclist moves in a circular path with constant speed. Where is the acceleration of the cyclist directed?

EASY
IMPORTANT

What is the direction of motion of a body moving in a curved path?

MEDIUM
IMPORTANT

If two objects move in a circular path of radii of 1 : 3 and take the same time to complete the circle, what is the ratio of their speeds?   

MEDIUM
IMPORTANT

A car moves in a circle of radius 20 m in 50 s with a uniform speed. Find the speed.

MEDIUM
IMPORTANT

An artificial satellite is moving in a circular orbit of radius 36,000 km. Calculate its speed if it takes 24 hours to revolve around the earth