Q No: 1 Circle the correct answer. 08 1. The velocity ...
Q
No: 1 Circle the correct answer. 08
1.
The velocity of projectile
at its maximum height is:
a) 𝑣𝑖
sin 𝜃
b) 𝑣𝑖
cos 𝜃
c) Maximum d) Zero
2.
.SI unit of impulse is:
a) 𝑘𝑔
𝑚
𝑠
-2 b) 𝑁
𝑠
c) 𝑁
d)
None of these
3.
Taking off rocket can be
explained by.
a) 1 st law of motion b) 2 nd law of motion c) Law of conservation of momentum d) Law of conservation of energy
4.
.The time rate of change of
momentum is called:
a) Force b) Impulse c) Acceleration d) Torque
5.
Which law of motion is also
called law of inertia?
a) 1st law b) 2nd law c) 3rd law d) 4th law
6.
Inertia of an object is
quantitative measure of its:
a) Volume b)
Density c) Mass d) Temperature
7.
The range of projectile is
same for angles of projection:
a) 30° and 45° b) 45° and 60° c) 50° and 45° d) 30° and 60°
8.
Motion of projectile is
_____________ dimensional.
a) One b) Two c) Three d) Four
Short
Questions: 2×7=14
1.
What
do you know about velocity and instantaneous acceleration?
2.
Define
impulse. Write its formula and unit.
3.
State
and write the 2nd law of newton.
4.
What
is the difference b/w elastic and inelastic collision?
5.
Prove
that force is equal to the time rate of change of momentum.
6.
Is
it possible that a body have constant acceleration but its velocity reverse its
direction?
7.
Find
the range of projectile.
Long
Questions: 08
1. What is meant by law of conservation of momentum? Prove it.
2. Define projectile motion. Find the expression for height and time
of flight.
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