What is the angle of reflection?
2 answers:
Explanation :
The process in which the object after striking on a reflecting surface bounces back is called reflection. This process is shown by the light and the sound waves etc.
There are two laws of reflection :
- The angle of incidence is equal to the angle of reflection.
- The normal, incident ray and the reflected ray and the point of incidence all lie in the same plane.
From the attached figure, it is clear that the angle of reflection is the angle between the reflected ray and the normal to the reflecting surface. It is denoted by .
Hence, the correct option is (C) " the angle that the reflected ray makes with a line drawn perpendicular to the reflecting surface ".
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Answer:
to overcome the out of friction we must increase the angle of the plane
Explanation:
To answer this exercise, let's propose the solution of the problem, write Newton's second law. We define a coordinate system where the x axis is parallel to the plane and the other axis is perpendicular to the plane.
X axis
fr - Wₓ = m a (1)
Y axis
N- = 0
N = W_{y}
let's use trigonometry to find the components of the weight
sin θ = Wₓ / W
cos θ = W_{y} / W
Wₓ = W sin θ
W_{y} = W cos θ
the friction force has the formula
fr = μ N
fr = μ Wy
fr = μ mg cos θ
from equation 1
at the point where the force equals the maximum friction force
in this case the block is still still so a = 0
F = fr
F = (μ mg) cos θ
We can see that the quantities in parentheses with constants, so as the angle increases, the applied force must be less.
This is the force that balances the friction force, any force slightly greater than F initiates the movement.
Consequently, to overcome the out of friction we must increase the angle of the plane
the correct answer is to increase the angle of the plane