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Class 7
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Physics
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Motion and Time
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Speed
Speed
Revise with Concepts
Speed-Basic
Example
Definitions
Formulaes
>
Uniform and Non- uniform Speed
Example
Definitions
Formulaes
>
Learn with Videos
Speed
8 mins
Uniform and Non-Uniform Motion
5 mins
Quick Summary With Stories
Basic Introduction of Speed
2 mins
Speed and its Unit
2 mins
Basic Knowledge of Uniform and Non-Uniform Motion and Average Speed
4 mins
Important Questions
An object, moving with a speed of 6.25 m/s, is decelerated at a rate given by:
d
t
d
v
=
−
2
.
5
v
where v is the instantaneous speed. The time taken by the object, to come to rest, would be:
Medium
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>
A bus travels 54 km in 90 minutes. The speed of the bus is?
Medium
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>
A body travelling with uniform acceleration crosses two points
A
and
B
with velocities
2
0
m
/
s
e
c
and
3
0
m
/
s
e
c
respectively then the speed of the body at mid point of
A
and
B
is
Medium
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>
Change the speed of
6
m
/
s
into
k
m
/
h
Medium
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>
What does the path of an object look like when it is in uniform motion?
Easy
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>
Two electrons lying
1
0
c
m
apart are released. What will be their speed when they are
2
0
c
m
apart?
Medium
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>
The distance between two stations is
2
4
0
km. A train takes
4
hours to cover this distance. Calculate the speed of the train.
Medium
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>
The odometer of a car reads
5
7
3
2
1
.
0
km when the clock shows the time
0
8
:
3
0
AM. What is the distance moved by the car, if at
0
8
:
5
0
AM, the odometer reading has changed to
5
7
3
3
6
.
0
km
?
Calculate the speed of the car in km
/
min during this time. Express the speed in km
/
h also.
Easy
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>
A uniform spherical shell of mass
M
and radius
R
rotates about a vertical axis on frictionless bearing. A massless cord passes around the equator of the shell, over a pulley of rotational inertia
I
and radius
R
and is attached to a small object of mass
m
that is otherwise free to fall under the influence of gravity. There is no friction of pulley's axle; the cord does not slip on the pulley. What is the speed of the object after it has fallen a distance
h
from rest? Use work-energy considerations.
Hard
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>
The distance between two stations is 240 km. A train takes 4 hrs. to cover this distance. Calculate the speed of the train.
Easy
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>