Pavitra Gupta 9312281591
Pavitra Gupta 9312281591
MOTION
Q.1
What do you mean by motion? Give an example to show that rest and motion are relative terms.
Q.2
Define scalar and vector quantities. Give 3 examples of each.
Q.3
Define distance. State whether it is a scalar or a vector quantity. What is its SI units?
Q.4
What do you mean by displacement? State whether it is a scalar or a vector quantity. What is its SI
units?
Q.5
State whether magnitude of displacement can be (i) greater than (ii) less than or (iii) equal to
distance travelled.
Write the conditions for the above cases whichever is possible?
Q.6
State whether distance travelled by a moving object can be (i) zero (ii) negative or (iii) positive.
Q.7
(i) Write the condition for the displacement of a moving body to be zero.
(ii) State whether displacement can be negative.
Q.8
Find distance and displacement for the following motion:
(i) A man travels a distance of 8 m from P to Q and then moves 6 m to R at right angle to PQ.
(ii) A man travels a distance of 2.5 m towards east, then 8 m towards south and finally 3.5 m towards
east.
(iii) A body is moving along a circular path of radius R. It completes:
(a) one fourth of the revolution
(b) half a revolution
(c) three fourth of the revolution
(d) one revolution
(e) two revolutions
(iv) A man travels on a straight line path. First he travels form O to P, a distance of 4 m and then comes
back 1 m on the same path at a point Q.
Q.9
Write 3 points of difference between distance travelled and displacement. Also write one similarity.
Q.10
What do you mean by speed and velocity? Which of them is a scalar and which is a vector quantity?
What are their SI units?
Q.11
What do you mean by average speed and average velocity? Which one of them can have zero
magnitude for a moving body and under what condition?
Q.12
State whether magnitude of average velocity can be (i) greater than (ii) less than or (iii) equal to
average speed.
Write the conditions for the above cases whichever is possible?
Q.13
(i) What do you mean by instantaneous speed and instantaneous velocity?
(ii) Is it possible that magnitude of instantaneous velocity is equal to instantaneous speed? If yes, state
the condition.
(iii) What is the relation between the directions of displacement and velocity?
Q.14
Define acceleration. Write an expression for acceleration. State whether it is a scalar or a vector
quantity. What is its SI units?
Q.15
A body is moving in straight line.
(i) What is its acceleration when it is moving with uniform velocity?
(ii) When will be its acceleration (a) positive (b) negative?
(iii) What will be the direction of acceleration when it is (a) positive
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(b) negative?
Pavitra Gupta 9312281591
Pavitra Gupta 9312281591
Pavitra Gupta 9312281591
Q.16
What do you mean by retardation? If retardation of a moving body is 2 m/s2 then what is its
acceleration?
Q.17
When do we say that a body is in
(i) uniform motion (speed)
(iv) non uniform motion (speed)
(vii) uniform retardation?
(ii) uniform velocity
(v) non uniform velocity
(iii) uniform acceleration
(vi) non uniform acceleration
Q.18
What kind of motion does a freely falling body have?
Q.19
Obtain the second equation of motion: s = ut + ½ at for a uniformly accelerated body (analytically).
Q.20
Obtain the third equation of motion: v = u + 2 as for a uniformly accelerated body (analytically).
Q.21
Draw the distance – time graphs for the following:
(i) stationary object
(ii) object with uniform speed
(iv) object with retardation (negative acceleration).
2
2
2
(iii) object with positive acceleration
Q.22
Draw the speed – time graphs for the following:
(i) stationary object (ii) object with uniform speed
(iii) object with uniform positive acceleration
(iv) object with uniform retardation.
(v) object with non uniform positive acceleration
(vi) object with non uniform retardation.
Q.23
(i) What does the slope of distance – time graph indicate?
(ii) What does the slope of speed – time graph indicate?
(iii) What does the area enclosed by the speed – time graph and the time axis indicate?
Q.24
What can you say about the motion of a body if :
(i) its distance – time graph is a straight line parallel to time axis
(ii) its speed – time graph is a straight line parallel to time axis
(iii) its distance – time graph is a straight line inclined to time axis
(iv) its speed – time graph is a straight line inclined to time axis?
Q.25
Obtain the second equation of motion: s = ut + ½ at for a uniformly accelerated body (graphically).
Q.26
Obtain the third equation of motion: v = u + 2 as for a uniformly accelerated body (graphically).
Q.27
What conclusion can you
2
2
2
of a body from the
speed – time graph shown:
speed
draw about the acceleration
time
Q.28
What is meant by uniform circular motion? Is it an accelerated motion? Explain. Is uniform motion in a
straight line an accelerated? Why?
Q.29
Name a quantity in uniform circular motion:
(i) which remains constant
(ii) which changes continuously
Q.30
A train travels the first 15 km at a uniform speed of 30 km/h; the next 75 km at 50 km/h and the last
10 km at 20 km/h. Calculate the average speed.
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Pavitra Gupta 9312281591
Pavitra Gupta 9312281591
Pavitra Gupta 9312281591
Q.31
On a 120 km track, a train travels the first 30 km at a uniform speed of 30 km/h. How fast must the train
travel the remaining distance so as to average a speed of 60 km/h?
Q.32
Find the initial velocity of a car which is stopped in 10 s by applying brakes. The retardation due to
brakes is 2.5 m/s2.
Q.33
A bus increases its speed from 36 km/h to 72 km/h in 10 s. What is its acceleration in SI units?
Q.34
A motorcycle moving with a speed of 5 m/s is subjected to an acceleration of 0.2 m/s2. Calculate the
speed of motorcycle after 10 s and the distance travelled in this time.
Q.35
Calculate the speed acquired by a train in 5 minutes just after its start, if the acceleration is 0.2 m/s2.
Also find the distance travelled by it in this time.
Q.36
From the given graph, calculate the speed of the
body for the following portion of the graph:
(i) A to B
(ii) B to C
(iii) C to D.
D
distance(cm)
6
B
3
0
.
C
A
2
5
10
12
Time(s) →
Q.37
From the adjoining graph, find
(i) velocity at C.
(ii) acceleration between A and B.
(iii) acceleration between B and C.
(iv) type of motion between A & B; between B & C and
between C & D.
(v) distance covered between B & C.
(vi) acceleration between C & D.
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Pavitra Gupta 9312281591