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An athlete completes one round of
a circular track of diameter 200 m in 40 s. What will be the distance covered
and the displacement at the end of 2 minutes 20 s?
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Joseph jogs from one end A
to the other end B of a straight 300 m road in 2 minutes 30 seconds and
then turns around and jogs 100 m back to point C in another 1 minute.
What are Joseph?s average speeds and velocities in jogging, (a) from A
to B and (b) from A to C?
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Abdul, while driving to school, computes the average speed for his trip to be 20 km
On his return trip along the same route, there is less traffic and the average speed is 40 km
What is the average speed for Abdul?s trip?
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A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of
for 8.0 s. How far does the boat travel during this time?
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A driver of a car travelling at 52 km
applies the brakes and accelerates uniformly in the opposite direction. The car stops in 5 s. Another driver going at 3 km
in another car applies his brakes slowly and stops in 10 s. On the same graph paper plot the speed versus time graphs for the two cars. Which of the two cars travelled farther after the brakes were applied?
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Figure given below shows the
distance-time graph of three objects A, B and C, study the
graph and answer the following questions?
(a)
Which of the three is travelling the fastest?
(b) Are all three ever at the same point on the road?
(c)
How far has C travelled when B passes A?
(d) How far has B travelled by the time it passes C?
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A ball is gently dropped from a
height of 20 m. If its velocity increases uniformly at the rate of
, with what
velocity will it strike the ground? After what time will it strike the ground?
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The speed-time graph for a car is shown in the figure.
(a) Find how far does the car travel in the first 4 seconds. Shade the area on the graph that represents the distance travelled by the car during the period.
(b) Which part of the graph represents uniform motion of the car?
-
State which of the following
situations are possible and give an example for each of these :
(a) an object with a constant
acceleration but with zero velocity
(b) an object moving in a
certain direction with an acceleration in the perpendicular direction
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An artificial satellite is moving in a circular
orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve
around the earth.
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An object has moved through a distance. Can it have zero displacement? If yes support your answer with an example.
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A farmer moves along the boundary of a square field of side 10 m in 40 s. What will be the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds?
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Which of the following is true for displacement?
(a) It cannot be zero.
(b) Its magnitude is greater than the distance travelled by the object.
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Distinguish between speed and velocity?
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Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?
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What does the odometer of an automobile measure?
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What does the path of an object look like when it is in uniform motion?
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During an experiment, a signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal travels at the speed of light, that is 3 x 108 m s-1?
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When will you say a body is in
(i) uniform acceleration?
(ii) non-uniform acceleration
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A bus decreases its speed from 80 km h-1 to 60 km h-1 in 5 s. Find the acceleration of the bus.
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A train starting from a railway station and moving with uniform acceleration attains a speed kmh-1 in 10 minutes. Find its acceleration.
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What is the nature of the distance-time graphs for uniform and non-uniform motion of an object?
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What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis?
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What can you say about the motion of an object if its speed-time graph is a straight line parallel to the time axis?
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What is the quantity which is measured by the area occupied below the velocity-time graph?
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A bus starting from rest moves with a uniform acceleration of 0.1 ms-2 for 2 minutes. Find
(a) the speed acquired,
(b) the distance travelled.
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A train is travelling at a speed of 90 kmh-1. Brakes are applied so as to produce a uniform acceleration of -0.5 ms-2. Find how far the train will go before it is brought to rest?
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A trolley, while going down an inclined plane, has an acceleration of 2 cm s-2. What will be its velocity 3s after the start?
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A racing car has a uniform acceleration of 4 m s-2. What distance will it cover in 10 s after start?
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A stone is thrown in a vertically upward direction with a velocity of 5 m s-1. If the acceleration of the stone during its motion is 10 m s-2 in the downward direction, what will be the height attained by the stone and how much time will it take to reach there?
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question_answer31)
A particle is moving in a circular path of radius r. The displacement
after half a circle would be
(a) zero                              (b) p r                                  (c)
2r                                    (c) 2 p
r
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question_answer32)
A body is thrown vertically upward with velocity u, the
greatest height h to which it will rise is
(a)
                                               (b)
                          (c)
                             (d)
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question_answer33)
The numerical ratio of displacement and distance for a
moving object is
(a) always less than 1 Â Â Â (b) always equal to 1 Â Â Â Â (c)
always more than 1Â Â (d) equal or less than 1
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question_answer34)
If the displacement of an object is proportional to square
of time, then the object moves with
(a) uniform velocity                                                      (b)
uniform acceleration             Â
(c) increasing acceleration                                          (d)
decreasing acceleration
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question_answer35)
From the given v-t graph (see figure), it can be inferred
that the object is
(a) in uniform motion                                                   (b)
at rest
(c) in non-uniform motion                                         (d)
moving with uniform acceleration
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question_answer36)
Suppose a boy is enjoying a ride on a merry-go-round which
is moving with a constant speed of 
.It
implies that the boy is
(a) at rest                                                                          (b)
moving with no acceleration
(c) in accelerated motion                                            (d)
moving with uniform velocity
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question_answer37)
Area under v-t graph represents a physical quantity which
has the unit
(a) 
                                 (b)
m                                   (c) 
                                  (d)
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question_answer38)
Four cars A, B, C and D are moving on a levelled road.
Their distance versus time graphs are shown in figure. Choose
the correct statement.                      Â
(a) Car A is faster than car DÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
       (b) Car B is the slowest                                  Â
(c) Car D is faster than car
CÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (d) Car C is the slowest
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question_answer39)
Which of the following figures represents uniform motion
of a moving object correctly?
(a) 
        (b) 
       (c)
        (d) 
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question_answer40)
Slope of a velocity-time graph gives
(a) the distance         (b) the displacement           (c)
the acceleration  (d) the speed
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question_answer41)
In which of the following cases of motions, the distance
moved and the magnitude of displacement are equal?
(a) If the car is moving on straight road                 (b)
If the car is moving in circular path
(c) The pendulum is moving to and fro                  (d)
The earth is revolving around the sun
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question_answer42)
The displacement of a moving object in a given interval of
a time is zero. Would the distance travelled by the object also be zero? Justify
your answer?
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question_answer43)
How will the equations of motion for an object moving with
a uniform velocity change?
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question_answer44)
A girl walks along a straight path to drop a letter in the
letter box and comes back to her initial position. Her displacement-time graph
is shown in figure. Plot a velocity-time graph for the same.
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question_answer45)
A car starts from rest and moves along the X-axis with
constant acceleration 
for 8 s. If it
then continues with constant velocity.
What distance will the car cover in 12 s, since it started
from rest?
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question_answer46)
A motorcyclist drives from A to B with a uniform speed of 
 and returns back with a
speed of
, Find its average speed.
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question_answer47)
The velocity-time graph (see figure) shows the motion of a
cyclist. Find (i) its acceleration (ii) its velocity and (iii) the distance
covered by the cyclist in 15 s.
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question_answer48)
Draw a velocity versus time graph of a stone thrown
vertically upwards and then coming downwards after
attaining the maximum height.
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question_answer49)
An object is dropped from rest at a height of 150 m and
simultaneously another object is dropped from rest at height 100 m. What is the
difference in their heights after 2 s, if both the objects drop with same accelerations?
How does the difference in heights vary with time?
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question_answer50)
An object starting from rest travels 20 m in first 2 s and
160 m in next 4 s. What will be the velocity after 7s from the start?
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question_answer51)
Using following data, draw time-displacement graph for a
moving object.
|
Time (s)
|
0
|
2
|
4
|
6
|
8
|
10
|
12
|
14
|
16
|
|
Displacement
(m)
|
0
|
2
|
4
|
4
|
4
|
6
|
4
|
2
|
0
|
Use this graph to find average velocity for first 4 s, for next 4 s and
for last 6 s.
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question_answer52)
An electron moving with a velocity of 
enters into a uniform
electric field and acquires a uniform acceleration of
 in the direction of its
initial motion.
(i) Calculate the time in which the electron would acquire
a velocity double of its initial velocity.
(ii) How much distance the electron would cover in this
time?
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question_answer53)
Obtain a relation for the distance travelled by an object moving
with a uniform acceleration in the interval between 4th and 5th
second.
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question_answer54)
Two stones are thrown vertically upwards simultaneously
with their initial velocities 
 and 
 respectively. Prove that
the height reached by them would be in the ratio of 
 (assume
upward acceleration is ? g and downward acceleration to be + g).
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