EVOC Emergency Vehicle Dynamics & Physics 2

Question 1

During hard emergency braking, vehicle weight transfers to which end of the vehicle?

Accepted Answer

The front axle

Answer

Inertia causes the vehicle's mass to continue forward during braking, transferring weight onto the front axle and increasing front-tire traction.

Question 2

What is 'understeer' in vehicle dynamics?

Accepted Answer

When front wheels lose traction and the vehicle plows straight despite steering input

Answer

Understeer occurs when front tires lose grip, causing the vehicle to continue in a straight path regardless of the steering wheel input.

Question 3

What is 'oversteer' in vehicle dynamics?

Accepted Answer

When the rear of the vehicle slides outward during a turn

Answer

Oversteer occurs when rear tires lose traction, causing the rear end to swing outward and the vehicle to rotate beyond the intended turn.

Question 4

During rapid acceleration from a stop, vehicle weight transfers to which axle?

Accepted Answer

Rear axle

Answer

Inertia resists forward acceleration, causing weight to shift rearward and reducing traction at the front axle during hard acceleration.

Question 5

How does a higher center of gravity affect rollover risk in an emergency vehicle?

Accepted Answer

Significantly increases rollover risk, especially during sharp turns

Answer

A higher center of gravity increases the lever arm of the tipping moment, making lateral forces more effective at rolling the vehicle.

EVOC - Emergency Vehicle Operator Course Certification Practice Test