Friction Quiz

Which of the following best describes what fluid means?

• A substance that flows and takes the shape of its container.
• A gas that has a fixed volume
• A solid that cannot change its shape
• A substance that is always in a frozen state

Which of the following is a method that could increase friction of a surface?

• Applying a lubricant to the surface
• Smoothing the surface
• Reducing the weight on the surface
• Roughening the surface

True or False: In order for there to be friction, two surfaces must be in contact.

• True

• False

When two or more forces act on an object at the same time it’s called a:

• net force
• joint force
• total force
• combined force

A friction-like force that opposes motion of objects moving through the air is called:

• Aerodynamic lift
• Air resistance

• Wind propulsion
• Frictional drag

Friction is caused by microscopic bumps on surfaces called:

• Microridges

• Microwelds

• Microgrooves

• Protrusions

Label each type of friction.

a

b

c

d

Static

Fluid

Sliding

Rolling

What are the types of friction? (select all that apply)

• Fluid

• Air Resistance

• Static

• Sliding

• Rolling

Adding oil or lubricant to a surface will _____ friction.

• increase

• decrease

Which is the weakest type of friction?

• Sliding

• Rolling

• Static

• Fluid