Do Anti-lock Brakes use Static or Kinetic Friction? by Billy

Billy's video project for Flipping Physics explores whether anti-lock brakes (ABS) use static or kinetic friction to slow down vehicles. ABS prevents wheel lock-up, maintaining static friction, which is more effective than kinetic friction. A bicycle demonstration illustrates the difference between static and kinetic friction. ABS uses sensors to adjust braking pressure, keeping wheels rolling without slipping. A video analysis on snow shows ABS's effectiveness, with 97% of braking using static friction. The conclusion emphasizes static friction's superiority in slowing vehicles.

What is the primary purpose of anti-lock brakes in modern vehicles?

• To increase the speed of the vehicle

• To prevent the wheels from locking up

• To enhance the vehicle's fuel efficiency

• To reduce the vehicle's weight

In the bicycle demonstration, what type of friction is used when the wheels roll without slipping?

• Rolling friction

• Kinetic friction

• Static friction

• Fluid friction

What happens to the rear tire of the bicycle when it is accelerated quickly?

• It increases in size

• It rolls without slipping

• It slips relative to the ground

• It stops rotating

How do ABS brakes maintain static friction during braking?

• By automatically adjusting the braking pressure

• By increasing the vehicle's speed

• By locking the wheels completely

• By reducing the vehicle's weight

What percentage of the time do anti-lock brakes use static friction according to the experiment?

• 75%

• 50%

• 100%

• 97%