Answer:
Step-by-step explanation:
a. normal force is mass * acceleration due to gravity, so the normal force is = 4 * 9.8, which is 39.2 N.
b. friction force is normal force * the coefficient of the friction, for static friction: .3 * 39.2 = 11.76 N. For kinetic friction: .1 * 39.2 = 3.92 N.
c. net force is the sum of all force apply on the object, since the object is rest at a table, then the only force apply on the object is the horizontal force, which is 10N, since the static force is greater than the force apply, then our net force is -1.76N( 10 - 11.76).
d. the acceleration of the box is 0 because the box is not moving.
a : normal force = 39.2N
b : static force = 11.76N, kinetic force = 3.92N
c : net force = -1.76N
d : acceleration = 0