U2 Videos FP 4.1.9

What forces act on a book at rest on a level surface when a person applies a force to the right, and what are their directions?

• Applied force (right), friction (left), force of gravity (down), normal force (up).

• Applied force (right), force of gravity (down), normal force (up).

• Friction (left), force of gravity (down), normal force (up).

• Applied force (right), friction (left), force of gravity (down).

When a book is at rest on a level surface, and Newton's Second Law is applied in the Y-direction, what is the relationship between the normal force (F_N) and the force of gravity (F_g)?

• F_N is greater than F_g.

• F_N is less than F_g.

• F_N equals F_g.

• The relationship depends on the applied horizontal force.

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In which of the following situations is the normal force not necessarily equal in magnitude to the force of gravity?

• A book at rest on a level surface with no other forces applied.

• A book on an inclined plane.

• A book being held against a vertical wall.

• Both B and C.

If a book is resting on a level surface and an additional downward force is applied to it, how does the normal force (F_N) from the surface change relative to the force of gravity (F_g) and the applied force (F_a)?

• F_N = F_g - F_a

• F_N = F_g + F_a

• F_N = F_g

• F_N is unrelated to F_g or F_a.