Final answer:
Static friction pertains to objects at rest and prevents them from moving, while kinetic friction slows down moving objects. Books on a desk and a parked car are examples of static friction, while moving furniture and riding a bike involve kinetic friction. Swimming and skydiving involve fluid friction.
Step-by-step explanation:
Static friction acts on objects or systems at rest and prevents them from starting to move, while kinetic friction acts on objects in motion and tries to slow them down. Fluid friction is another type of friction that happens when objects move through fluids (liquids or gases), such as air or water.
Here is how the scenarios fit under each type of friction:
- Static Friction: books on a desk, a parked car
- Kinetic Friction: moving furniture, riding a bike
- Fluid Friction: swimming, skydiving
The maximum static friction is usually greater than the kinetic friction between the same objects, due to the initial force required to overcome the inertia of rest. When calculating the magnitude of these frictional forces, keep in mind that static friction has a maximum value before motion occurs, and kinetic friction is typically a constant value while motion is ongoing.