Question

which force best describes what happens when a mat on the floor prevents people from slipping when they come in the door with wet feet?
a) gravity
b) applied force
c) normal force
d) friction

Explanation:

Friction is a force that opposes relative motion between two surfaces in contact. A mat on the floor increases the friction between a person's wet feet and the floor. This increased friction prevents slipping. Gravity is the force that attracts objects towards each other (e.g., Earth's gravity pulling objects downwards). An applied force is a force that is applied to an object by a person or another object. The normal force is the force exerted by a surface perpendicular to the object in contact with it. None of these (gravity, applied force, normal force) directly explain the prevention of slipping in this context like friction does.

Answer:

D. friction