FRICCION Y FUERZA

What is the direction of the friction force relative to the relative motion between two surfaces?

• In the same direction

• Perpendicular to the motion

• Opposite to the motion

• Independent of the motion

A person pushes a refrigerator with an increasing horizontal force, but the refrigerator does not move. How does the static friction force respond to the increasing applied force?

• It remains constant at its maximum value.

• It decreases as the applied force increases.

• It increases to match the applied force, up to a maximum.

• It becomes zero until the refrigerator starts moving.

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Which statement accurately describes the relationship between the coefficient of static friction (μs) and the coefficient of kinetic friction (μk)?

• μs is always equal to μk.

• μs is generally greater than μk.

• μs is generally less than μk.

• The relationship depends on the contact area.

A box with a mass of 10 kg rests on a horizontal surface. The coefficient of static friction (μs) is 0.5, and the coefficient of kinetic friction (μk) is 0.4. If you push the box with a horizontal force of 40 N, what is the magnitude of the friction force acting on the box? (Assume g = 9.8 m/s²)

• 39.2 N

• 40 N

• 49 N

• 98 N