Are we in learning?
In the discussion of mechanics part-ii (lecture iv, V &Vi)
What are force and friction force?
Kinds of natural forces and friction forces
What are the depending parameters of friction forces?
Have any difference between natural and normal force of an object?
What are in this session??
What is friction coefficient?
How friction coefficient depends on push or pull of an object?
What is Mechanical work and energy?
Classification of mechanical energy.
This session…
How works differ on plane, incline plane and direct upward body?
Work-energy theorem
Momentum, conservation of
momentum and moment of inertia
Moment of inertia for some cases
This session…
Problem Practice for understanding:
A 60 kg box is pushed by 600 N forces with
an angle of 45
oalong to the horizontal line.
The box gained velocity 4 m/s starting from rest at 5 seconds. Find the friction coefficient of the box.
A 60 kg box is pulled by 600 N forces with an angle of 45
oalong to the horizontal line. If the sliding (kinetic) friction coefficient of the box is 0.4, find the acceleration of the box.
This session…
Problem cont..
A 10kg box is taking from bottom to the top of an
incline pushing up at constant speed of 15 m long and 10m directly above from bottom. Consider
frictionless surface, how much work must be done a force parallel to the incline pushing up the box?
A 4 kg box is moving at a constant speed of 5m/s on a frictionless surface. A spring is used to take the box at rest. How much the spring will
elongate if the spring constant of the spring is 200N/m?
This session…
Problem cont..
A 400 kg car is moving with a speed of
40km/hr and a motor bike of 80kg is moving with a speed of 60km/hr in the same
direction. If the collide to each other find their velocity just after collision.
