3 chapter - numericals || 9th class physics || Dynamics problems || matric numericals.
This video is related to 3 chapter Numericals of 9th class physics ( Dynamics ). (Punjab textbook)@fanticer
0:09. 3.1 A force of 20N moves a body with an
acceleration of 2m/s^2. What is its
mass? (10kg)
2:34. 3.2 The weight of a body is 147 N. What is
its mass? (Take the value of g as
10m/s^2) (14.7kg)
3:44. 3.3 How much force is needed to prevent a
body of mass 10kg from falling? (100N)
6:39. 3.4 Find the acceleration produced by a
force of 100N in a mass of 50kg.
(2m/s^2)
8:21. 3.5 A body has weight 20N. How much
force is required to move it vertically
upward with an acceleration of 2m/s^2?
(24N)
12:44. 3.6 Two masses 52kg and 48kg are
attached to the ends of a string that
passes over a frictionless pulley.Find
the tension in the string 🧵 and
acceleration in the bodies when both
the masses are moving vertically.
(500N , 0.4ms^2)
16:54. 3.7 Two masses 26kg and 24kg are
attached to ends of a string 🧵 which
passes over a frictionless pulley. 26kg
is lying over a smooth horizontal table.
24N mass is moving vertically
downward. Find the tension in the
string and the acceleration in the
bodies. (125N, 4.8m/s^2)
20:02. 3.8 How much time is required to change
22Ns momentum by a force of 20N?
(1.1s)
21:17. 3.9 How much is the force of friction
between a wooden block of mass 5kg
and the horizontal marble floor? The
coefficient of friction between wood🪵
and the marble is 0.6. (30N)
23:50. 3.10 How much centripetal force is needed
to make a body of mass 0.5kg to
move in a circle ⭕ of radius 50cm to
with a speed 3m/s? (9N)