# Waec physics practical Questions and answers 2023

Here is the Waec physics practical Questions and answers 2023

(1bi)
Firstly, the net force acting upon the object must be zero. Secondly, the net torque acting upon the object must also be zero.

(1bii.)
Let F1 = 4N and F2 = 3N.
Resultant force (R) = √(F1^2 + F2^2)
= √((4N)^2 + (3N)^2)
= √(16N^2 + 9N^2)
= √(25N^2)
= 5N(1bi)
(i)Firstly, the net force acting upon the object must be zero.
(ii)Secondly, the net torque acting upon the object must also be zero.
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(2bi)
(i) The light ray moves from a more dense medium to a less dense medium.

(ii)The angle of incidence must be greater than the critical angle

(2bii)The Snell’s law of refraction states that: The incident ray, the refracted ray and the normal at the point of incidence, all lie in the same plane.
(2bi)
If the angle of incidence (θ₁) is greater than the critical angle (θ_c), then total internal reflection occurs.

(2bii) Snell’s law states that the ratio of the sine of the angle of incidence (θ₁) to the sine of the angle of refraction (θ₂) is equal to the ratio of the velocities of light in the two media, which is also equal to the inverse ratio of their refractive indices.
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