PART 4

Question 1

Complete the sentence: The faster your reactions,

Answer 1

The shorter your reaction time.

Question 2

Complete the equation for thinking distance

Answer 2

Thinking distance = speed of the car × driver’s reaction time

Question 3

Which of the following distances will be affected if a driver is under the influence of alcohol? Underline the correct answer or answers:

Answer 3

• *Thinking distance braking distance stopping distance**
• *(Braking distance is not affected by alcohol)**

Question 4

Write down three factors affecting car braking distance.

Answer 4

• *Air bags**
• *Seatbelts**
• *Crumple zones**

Question 5

Fill in the gaps to explain how these safety features help to prevent or reduce injury.

Answer 5

1. In a crash the driver’s momentum goes from high momentum to zero momentum very quickly.

The longer the time taken to stop, the smaller** the force on the driver and the smaller the risk of injury. Air bags, seatbelts and crumple zones all **increase the amount of time it takes the driver to stop moving during a collision.

Question 6

During a collision, momentum is conserved. What does this mean?

Answer 6

The total momentum before the collision = the total momentum after the collision