Motion Flashcards
When an object is said to be at rest?
When the position of an object does not change with respect to its surroundings with time
When an object is said to be in motion?
When the position of an object changes with respect to its surroundings with time
Define uniform motion
If an object travels equal distances in equal interval of time then it is said to be in uniform motion
Which graph is used to represent uniform motion?
Distance time graph
What is the shape of distance time graph of uniform motion?
Straight line
What is the shape of distance time graph of an object at rest?
Straight line parallel to time axis
Define non uniform motion
If an object travel unequal distances in equal interval of time then it is said to be in non uniform motion
What is the shape of distance time graph of non uniform motion?
Curved line
Define scalar quantity. Mention few examples
A physical quantity which has only magnitude and no specified direction.
For example,
Volume
mass
density
distance
speed
work
energy
power
pressure
electric current
Define vector quantity. Mention few examples.
It is a physical quantity which has both magnitude and direction. For example
Displacement
acceleration
velocity
force
Momentum
weight
Define distance
The distance travelled by a moving body is the actual length of the path covered by a moving body irrespective of its direction in which the body travels.
Is distance vector quantity or scalar quantity?
Scalar quantity
What is the SI unit of distance?
Metre (m)
What is the distance traveled by an object along a circular path with radius r?
2×pie×r
What is the distance traveled by an object along a semicircular path with radius r?
Pie×r
What is the distance travelled by an object triangular path of side a?
3a
What is the distance travelled by an object along a square path of side a?
4a
Define displacement
The shortest distance between the initial position and the final position of the body along with direction
What is the SI unit of displacement?
Metre (m)
Is displacement a scalar quantity or vector quantity?
Vector quantity
If an object is moving on a circular path of radius R then what would be its displacement?
0, because its final position and the initial position are same.
What is the difference between distance and displacement?
Distance
1) the distance travelled by an object is a actual length of the path covered by an object irrespective of its direction in which the body travels
2) distance is a scalar quantity
3) distance can never be zero
4) distance is always positive
5) the magnitude of distance is always greater than that of displacement
Displacement
1) the shortest distance between the initial position and the final position along with the direction
2) displacement is a scalar quantity
3) displacement can be zero
4) distance can be positive as well as negative
5) the magnitude of displacement is always smaller than that of distance
Define speed
The distance travelled by an object per unit time
What is the formula of speed?
Speed = distance/time
Is speed a scalar quantity or vector quantity?
Scalar quantity
What is the SI unit of speed?
m/s
Name the device used to measure speed?
Speedometer
Name the device used to measure distance
Odometer
Define uniform speed
If an object travel equal distances in equal of time then it is said to be in uniform speed
Define non uniform speed
If an object travels unequal distances in equal interval of time then it is said to be in non uniform speed
Define velocity
The displacement produced by an object per unit time
Formula to find velocity
Velocity=displacement/time
SI unit of velocity
m/s
Is velocity scalar quantity or vector quantity?
Vector quantity
Define uniform velocity
If an object travels equal displacement in equal interval of time then it is said to be in uniform velocity
Define non uniform velocity
If an object travels unequal displacement in equal interval of time then it is said to be in non uniform velocity
Define acceleration
Acceleration of a body is the rate of change of its velocity with the time
Formula of change in velocity
Final velocity - Initial velocity
v - u
Formula of acceleration
v-u/t
Is acceleration of scalar or vector quantity
Vector quantity
SI unit of acceleration
m/s²
If an object is moving with uniform velocity what will be its acceleration?
0, because final velocity and initial velocity are equal
What is retardation?
The negative acceleration is called retardation.
Define uniform acceleration
A body has uniform acceleration if it travels in a straight line and its velocity increases by equal amount in equal interval of time.
What is the shape of velocity time graph of uniform acceleration?
Straight line
Define non uniform acceleration
If the velocity of a body increases by unequal amounts in equal interval of time then it is said to be a non uniform acceleration
What is the shape of velocity time graph of non uniform acceleration?
Curved line
Define average speed
The ratio of the total distance travelled by an object to the total time taken
Define average velocity
The ratio of the total displacement produced by object to the total time taken
What are the three equations of motion?
1) v=u+at
2) s= ut + 1/2at²
3) v²-u²= 2as
