... on it in a direction making anangle 60 degree with x axis and displaces it lalong 4 meters the work done by the force is
Answers (1)
You need to be perfectly prepared in trigonometry to do well in physics. Trigonometry is based on a picture of a circle with the radius making an angle with the x axis. You carry this picture in your head, not your calculator. Trig is mostly imagination and the rest memorization.
Remember Chief SohCahToa
Sin = Opposite/Hypotenuse
Cosine = Adjacent/Hypotenuse
Tangent = Opposite/Adjacent
Also memorize:
Sec = 1/Cos
Csc = 1/Sin
Cot = 1/Tan
The force at a given angle is analyzed according to horizontal and vertical projections. The horizontal projection is proportional to the cosine of the angle.
10cos(60) = 10 x 0.5 = 5 newtons
Work is performed by a force acting through a distance.
w = 5 newtons x 4m = 20 joules