EVOC Emergency Vehicle Dynamics & Physics

Question 1

When a driver doubles their speed, how does stopping distance change?

Accepted Answer

It quadruples (4×)

Answer

It doubles (2×)

Answer

It triples (3×)

Answer

It increases by 50%

Question 2

What is the correct braking technique for a vehicle equipped with anti-lock brakes (ABS) during an emergency stop?

Accepted Answer

Apply firm, continuous pressure and hold

Answer

Rapidly pump the brake pedal

Answer

Apply, release, and reapply in 2-second cycles

Answer

Use very light, gradual pressure to avoid skidding

Question 3

Which single factor has the greatest impact on total stopping distance at highway speeds?

Accepted Answer

Vehicle speed

Answer

Tire tread depth

Answer

Road surface condition

Answer

Driver reaction time

Question 4

What causes brake fade during prolonged heavy braking?

Accepted Answer

Overheating of brake components reducing friction effectiveness

Answer

Loss of hydraulic brake fluid pressure

Answer

Air entering the brake lines during compression

Answer

Unequal weight distribution between front and rear axles

Question 5

How does a heavier vehicle load affect stopping distance?

Accepted Answer

Increases stopping distance due to greater kinetic energy

Answer

Decreases stopping distance due to better tire contact

Answer

Has no effect if tires are properly inflated

Answer

Only affects stopping distance on grades steeper than 6%

Question 6

What is the recommended technique to prevent brake fade when descending a steep grade?

Accepted Answer

Use engine braking by downshifting and apply brakes intermittently

Answer

Keep brakes continuously applied at moderate pressure throughout the descent

Answer

Apply full brake pressure periodically, then release completely

Answer

Increase speed to generate air resistance and reduce brake reliance

Question 7

At what approximate speed does hydroplaning typically begin on a wet road surface?

Accepted Answer

35 mph

Answer

20 mph

Answer

50 mph

Answer

65 mph