Which of the following examples illustrates static friction in action?
a. a ball rolling down a hill
b. a skater gliding across the ice
c. a plane flying through the air
d. a car starting to move after the light changes from red to green

Answer;

D. a car starting to move after the light changes from red to green

Explanation;Static friction is a type of friction or a force that is experienced by a body or a substance at rest. Therefore, when a force is applied on a body or an object at rest it opposes the static friction.Static friction does not have the ability to move an object or induce motion since it is countered by other strong opposite forces. Static friction must be overcome to cause motion of the object. When a body or an object is in motion it experiences kinetic friction. Therefore, when a body at rest starts to move then the friction changes to kinetic friction.

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