Carolina wanted to visit her grandmother. She decided to walk instead of bike due to the icy sidewalks. As she walked, she thought about the fa amount of friction between her feet and the ice-free sidewalk prevented her from slipping as she walked. What kind of force does this show? contact force noncontact force gravity force friction force

## Step 1<br />The problem describes a situation where Carolina is walking on a sidewalk. The friction between her feet and the ice-free sidewalk prevents her from slipping. This is a clear example of a contact force.<br /><br />## Step 2<br />Contact forces are those that occur when objects are in physical contact with each other. In this case, the friction between Carolina's feet and the sidewalk is a result of their physical contact.<br /><br />## Step 3<br />The other options, noncontact force, gravity force, and friction force, do not apply in this situation. Noncontact forces, such as gravity, can act at a distance and do not require physical contact. Gravity is a force that acts on all objects with mass, pulling them towards the center of the Earth. Friction is a type of contact force, but it is not the force being described in this situation.