Question

A box is placed on a flat surface. Jane lifts one end of the surface, making an angle with the floor. As she increases the angle that the surface makes with the floor, the box eventually begins to slide down because

Group of answer choices

only component of the gravitational force parallel to the plane increased

only normal force exerted by the board decreased

only coefficient of static friction decreased

component of the gravitational force parallel to the plane increased and normal force exerted by the board decreased

component of the gravitational force parallel to the plane increased, coefficient of static friction decreased and normal force exerted by the board decreased

Answer 1

Answer :

As Jane lifts one end of the surface, making an angle with the floor.

component of the gravitational force parallel to the plane increased and normal force exerted by the board decreased.  

Beacuse,

Component of the gravitational force parallel to the plane is given by : m g sin

Thus, as is increased, m g sin will also increases.

and, normal force exerted by the board is given by : N = mg cos

Thus, as is increased, m g cos will decreases.