Q. Define the terms speed, velocity and acceleration.
Ans.
Speed:
The distance covered per unit time is called speed.
Velocity:
The rate of change of displacement is called velocity.
Acceleration:
The rate of change of velocity is called acceleration.
Q. Can a body moving at a constant speed have acceleration?
Ans. Yes, it is possible. The
change in direction of the moving body produces acceleration. For example a
body moving in circular path with constant speed has acceleration.
Q. how do riders in a Ferris wheel possess translatory
motion but no circular motion?
Ans. the
riders do not move in circle of constant radius, therefore their motion is not
circular. So they possess translatory motion.
Q. What would be the shape of a speed-time graph of a body moving with
variable speed?
Ans. When the body moves with
variable speed, the shape of its speed-time graph would be a zigzag.
Q. Which of the following can be obtained from speed-time graph of a
body?
o Initial speed
o Final speed
o Distance covered in time t
o Acceleration of motion
Ans. From speed-time graph
o
Initial speed
o
Final speed
o
Distance covered in time t
o
Acceleration of motion
Can be calculated.
Q. How can vector quantities be represented graphically?
Ans.
Graphically vector quantities are represented by straight line. The straight
line has arrow-head at its one end. The length of the of straight line
represents its magnitude and the arrow-head represents the direction of the
vector quantity.
Q. Why vector quantities cannot be added and subtracted like scalar
quantities?
Ans. The addition and
subtraction of vector and scalar quantities is not under the same method. Head
to tail rule is used for the addition and subtraction of vector quantities
while scalar quantities are added and subtracted by simple algebraic method.
Therefore, vector quantities cannot be added and subtracted like scalar
quantities.
Q. How are vector quantities important to us in our daily life?
Ans. In our daily life vector
quantities are important to us because with the help of them, position of the
object with distance and direction can completely be explained.
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