Short Questions Flashcards
What is Uniform circular motion
Uniform circular motion is the motion in which an object moves on a circular path with constant speed. For example: watch, moon revolve
around earth etc
What is Non uniform circular motion
Non uniform circular motion is the motion in which an object is moves on circular path with varying speed. When an object is in circular
motion, direction of its velocity keeps on changing.
What do you mean by motion?
Motion is the change in the position of object over time
Define origin?
The position of an object we need to specify at the reference point is called the origin.
Which is the simplest type of motion?
The simplest type of motion is the motion along a straight line
What is magnitude?
The numerical value of a physical quantity is called a magnitude.
Define displacement?
The shortest distance measured from the initial to the final position of an object is called displacement.
What is an odometer?
Automobiles are fitted with a device that shows a distance travelled that device is called an odometer.
How can we change the velocity of an object?
The velocity of an object changes from an initial value to the final value in time the acceleration is a= v – u / t.
What is the SI unit of the acceleration?
The SI unit of the acceleration is m/s -2
What are the two graphical representation of motion?
Distance- time graphs and Velocity-time graphs are the two graphical representation of motion.
What is acceleration?
The acceleration of an object is the change in velocity per unit time.
A car covers a distance x, while moving at 50km/h in 10 seconds, find the value of x.
Risha is travelling by a train which is moving with a constant velocity of 100km/h. how much distance will it cover in 20s?
When is a body said to have uniform velocity?
Give an example of non- uniform acceleration. What all ways the velocity of the body can be changed?
What is the use of distance -time graph?
The speed of the body can be known from distance -time graph
When is the acceleration taken as negative?
Acceleration is taken as negative if direction of motion is opposite to the direction of velocity.
What are Scalar and Vector Quantities?
: A scalar quantity describes a magnitude or a numerical value.A vector quantity describes the magnitude as well as the direction
What is non-uniform motion?
: When an object travels unequal distances in equal intervals of time the object is said to have a non-uniform motion
Can a body have constant speed but variable velocity?
Yes, when the body is in uniform circular motion it has constant speed but due to the change in the direction of motion, its velocity
changes at every point.
In a distance -time graph which physical quantity is taken on the x-axis?
Time is taken on the x-axis and distance on the y-axis.
What indicates the motion of the earth?
The phenomena like day and night indicates the motion of the earth
Give an example of circular motion.
Motion of an artificial satellite around the earth.
An object moves with uniform positive acceleration. What will be its velocity -time graph?
: A straight line inclined at an acute angle to the time axis.
What is essential to describe the position of an object?
We need to specify a reference point called the origin to describe position of an object
Give an example when acceleration is in the direction of the motion. Write the S.I. unit of acceleration.
Freely falling body.
S.I. unit is ms-2
Are rest and motion absolute or relative terms? Which speed is greater 30m/s or 30km/h?
They are relative terms.
30m/s
What is the relation between linear velocity and angular velocity?
Linear velocity= angular velocity x radius of circular path.
