Wednesday, 6 September 2017
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Saturday, 2 September 2017
CLASS 9 / PHYSICS / NUMERICAL REVISION
ARMY PUBLIC SCHOOL,
GOLCONDA
CLASS 9
Q.1)
A scooter starts from rest moves in a straight line with a constant acceleration
and covers a distance of 64 m in 4 seconds. Calculate its acceleration and
final velocity.
Q.2)
In the given speed-time particle is moving in a straight line motion. Thus speed
can be considered as velocity. Observe the given graph and answer the following
question-
a) Calculate the value of acceleration for t= 0 to
20 sec, t= 20 to 50 sec, t= 50 to 100 sec.
b) What information u will conclude from the above
values of acceleration?
c) Show which part of the graph represents uniform acceleration,
zero acceleration and uniform retardation.
d) Calculate the total distance travelled.
Q.3)
Velocity-time graph for body A, B and C is given. Which covers the maximum
distance in given time?
Q.4)
In the given distance – time graph of a body, answer the following questions
a) Calculate distance travelled in 20, 35 and 45
sec.
b) Distance travelled in last 10 sec.
c) Displacement carried in time 0 to 45 seconds.
Q.5)
Cars
of mass 1800 kg moving with a speed of 10 m/s is bought to rest after covering
a distance of 50 m. Calculate the force acting on the car. Name the force and
identify the direction of applied force.
Q.6)
A body of mass 5 kg is moving with a velocity of 10 m/s. A force is applied to
it so that in 25 seconds, it attains a velocity of 35 m/s. Calculate the value
of force.
Q.7)
The velocity-time graph of a truck is shown as below. The truck weighs 1000 kg.
a) What is the accelerating and breaking force
acting on the truck?
b) Find momentum of car during t = 2 to 5 seconds
Q.8)
How
much momentum will a dumb-bell of mass 10 kg transfer to the ground floor if it
falls from a height of 80 cm?
( g = 10 m/s2).
Q.9)
A rifle of mass 3 kg fires a bullet of mass 0.03 kg. The bullet leaves the
barrel of the riffle at a velocity of 100 m/s. Find the recoil velocity of
rifle.
Q.10)
from a rifle of mass 4 kg, a bullet of mass 50 kg is fired with an initial
velocity of 35 m/s. Calculate the initial recoil velocity of rifle.
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CONCEPT MAP POINTS TO REMEMBER 1. If a ray stands on a line, then the sum of the two adjacent angles so formed is 180° and vice- ...
