Dr. Jonathan Y. answered • 06/16/20
Physics Teacher at pre-college level for over 3+ years
Draw the force diagram first.
Wyzant will not allow diagram or picture here. So contact me if you need help to do so.
NOTHING is moving ...
∑F = 0
let set the +x direction as the downwards on the table top and
+y direction as the upwards from the table top
JUST looking at the centerpiece, the object.
∑Fx = mgsinθ - f = 0
∑Fy = N - mgcosθ = 0
from the second equation, we have:
N = mgcosθ = (2Kg) (9.8 m/s2) cos 30°
= 2 x 9.8 x 0.8860 (Kg•m/s2) the unit is Newton, N.
= 17 N// answer.
Will the Normal force change if the object starts and keeps moving?·
