Friction

Friction is a force that resists motion between objects in contact. It acts in the opposite direction of movement and can transform kinetic energy into heat. Friction is categorized into sliding, rolling, and fluid types, each with unique characteristics and examples. Sliding friction occurs when surfaces slide over each other, rolling friction involves objects like wheels, and fluid friction occurs in liquids and gases. Understanding friction is crucial for calculating forces affecting objects.

What is the primary role of friction in motion?

• To resist motion

• To change direction

• To create energy

• To accelerate objects

Which type of friction occurs when two solid surfaces slide over each other?

• Rolling friction

• Fluid friction

• Sliding friction

• Static friction

Why is rolling friction generally less than sliding friction?

• Because it involves less surface area

• Because it involves more energy

• Because it is not affected by gravity

• Because it occurs in fluids

What determines the amount of fluid friction an object experiences?

• The temperature of the fluid

• The speed of the object

• The thickness of the fluid

• The color of the object

How does fluid friction in water compare to that in air?

• It is generally less in water

• It is the same in both

• It is generally more in water

• It does not exist in water