1 A body moves in a circle of radius 2R What is the distance covered and - Science -

Question

1 A body moves in a circle of radius ‘2R’ What is the
distance covered and the displacement of the body after 2 complete
rounds?2 What can you say about the motion of an object whose
distance-time graph is a straight line parallel to the time axis?3
Define speed of a body?1 A boy after going around a circular track
of radius ‘r’ comes back to the starting point What is
the(i) Displacement of the body?(1 Write the other name for
non-uniform motion 2 Draw a velocity-time graph for a body moving
with a uniform acceleration Assume that the body is initially at
rest 3 Give an example of a motion in which distance is covered but
there is no displacement 4 What is retardation? Give its SI unit 5
Can a body have acceleration while at rest? Give an example 6 A car
travels 1 km and returns back to the same point in a different path
What is the average velocity?7 Relate 36 km/h with m/sec 8 A
cyclist is riding a circular path of radius 5 m with a speed of
10m/s What is the change in velocity when he has travelled through
a semicircle?9 If 5m/s and 10m/s are the velocities of a body
having a uniform acceleration in some time interval, what will be
its average velocity?10 Is uniform circular motion, an example of
constant acceleration?ii) Total distance covered by him? 19 Write
is the other name for non-uniform motion 20 Draw the velocity-time
graph for a body moving with a uniform acceleration Assume that the
body is initially at rest 21 What does a speedometer measure?22
Name a physical quantity that (i) varies (ii)
remains same, in a uniform circular motion 23 When a body moving
with a speed of 20m/sec stops in 20 seconds, what is the
acceleration?24 What is the value of acceleration, if v-t
graph is a straight line parallel to the time axis?26
Give one type of motion where distance and displacement are same 27
A moving body with a constant speed, say 10ms-1 on a
frictionless surface has uniform motion while a freely falling
object has non-uniform motion Give reason 28 A 150m long train
crosses a bridge of length 250m in 25 seconds What is its
velocity?29 A ship is moving at a speed of 56km/h One second later
it is moving at 58km/h What is its acceleration?30 The speed of a
car is 54km/h Express this speed in m/s and calculate the distance
covered by the car in 5 seconds 31 A car travelling at 20km/h
speeds up to 60km/h in 6 seconds What is its acceleration?32 Name
the physical quantity needed for the acceleration to be non-uniform
33 Express km/h2 in ms-2 34 If a car starts
from rest and attains 20 ms-1 on 25 seconds Find the
acceleration 35 How long will it take for a body accelerating by 2
ms-2 to gain a velocity of 10 ms-1, starting
from rest?36 When the slope of v-t graph is –ve and
constant, what is the nature of acceleration?37 A car accelerates
uniformly from 18km/h to 36km/h in 5s, calculate acceleration
in:(i) km/h2(ii) m/s238 What do you mean by
uniform acceleration?39 A train travels from station A to station B
with a speed of 36km/h and returns to A with a speed of 54km/h What
is the average velocity and the average speed of travel?40 Draw the
shape of v-t graphs in the following cases:(i) Uniform
retardation(ii) Non-uniform retardation41 A body is moving with a
velocity of 10 m/s If the motion is uniform, what will be its
velocity after 10 seconds?42 A graph drawn between speed and time
for a moving body is found to be a straight line parallel to the
time axis What conclusion can you draw from the graph about the
speed of the body?43 A man keeps 12 steps in Northern direction and
turns left to keep 5 steps He then returns to the initial point by
the shortest path Find: (i) Distance travelled(ii) Displacement
[Given: each step is 0 3m ]44 Identify the scalars and vectors
among the following: Mass, acceleration, velocity, pressure, force
45 Is displacement independent of path? How?46 A man travels 10m to
the east, 20m to the north and then 20√2m south-west Find:(i)
Displacement and(ii) Distance travelled47 A car travels with a
velocity of V1 m/s for S m and with V2 m/s
for another S m What is the average velocity in the straight line
motion?48 A train is moving with a velocity of 36km/h Calculate the
distance travelled by the train in:(i) 1 hour(ii) 1 minute 49 A
child completes a circular track of 200m length in 10 seconds Find
the speed and velocity 50 A cyclist has a speed of 5m/s North wards
He changes the direction to west and continues with the same speed
of 5m/s Is there any acceleration? (Time taken is 5 second)51 A car
moves with a speed of 30km/h for half an hour, 25km/h for one hour
and 40km/h for two hours, calculate the average speed of the car 52
What is meant by uniform and non-uniform motion? What is the nature
of distance-time graphs for uniform and non-uniform motion of an
object?54 A car travelling at 20km/h, it speeds up to 60km/h in 6
seconds What is its acceleration?55 A circular track has a
circumference of 3140m with AB as one of its diameter A scooterist
moves from A to B along the circular path with a uniform speed of
10 m/s Find:(a) Distance covered by the scooterist(b) Displacement
by the scooterist(c) Time taken by the scooterist in reaching from
A to B56 A car travels 30 km with a speed of 40km/h and the next
30km with a uniform speed of 20km/h, find the average speed 57 On a
120m track, a train travels the first 30km at a uniform speed of
30km/h for the next 0 24h and then at 70km/h for the next 0 71h
What is the average speed of the train?59 A scooterist travels at a
speed of 5m/s for 2 minutes, at 12 5m/s for 10 minutes and then
with 10m/s for 5 minutes What is the average velocity and distance
covered in this time?60 A car moves in a circular path of radius 14
m at a speed of 10 m/s Evaluate: (i) Time taken to complete the
circle(ii) Does the motion have uniform acceleration? Give reasons
(iii) Find the angular velocity 61 State which of the following
situations are possible and give an example of each of these:(a) A
body moving with a constant acceleration but with zero velocity (b)
A body moving with acceleration in a vertical direction (c) A body
moving with a constant velocity in an accelerated motion 62 Joseph
jogs from one end A to the other end B of a straight 300m road in 2
minutes 50 seconds and then turns around and jogs 100m back to
point C in another 1 minute What are Joseph’s average speeds
and velocities in jogging(a) From A to B(b) From A to C

veena Vasandani · Accepted Answer

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