Q: When you are walking on a sidewalk, what occurs between your shoes and the concrete each time you put down your foot?


Read this paragraph and choose the correct option from the provided answers:

Static friction acts on objects when they are resting on a surface. For example, if you are walking on a sidewalk, there is static friction between your shoes and the concrete each time you put down your foot (see Figure below ). Without this static friction, your feet would slip out from under you, making it difficult to walk. Static friction also allows you to sit in a chair without sliding to the floor. Can you think of other examples of static friction?.

 Choices:

- movement

- progress

- grip

- static friction


A:
static friction