SP1g Vehicles: stopping and crashing

Question 1

Reaction time?

Answer 1

the time between a person detecting a stimulus and their response.

Question 2

How can response times be measured?

Answer 2

using, computers, electric circuits which measure time between the stimulus and the response, ruler drop experiment.

Question 3

What are some things that affect stopping distance? (related to thinking)

Answer 3

.drugs
.alcohol
.distractions (e.g.phone)
.tiredness

Question 4

What are some things that affect stopping distance? (related to braking)

Answer 4

.conditions of brakes
.conditions of tyres
.weather conditions
.mass of car

Question 5

What does the force needed for any kind of deceleration depend upon?

Answer 5

.the size of the deceleration
.the mass of the object

Question 6

Explain what is happening when a vehicle is decelerating.

Answer 6

when a force is applied to the brakes of a vehicle, there is work done by the friction between the brakes and wheel. This reduces the kinetic energy of the vehicle, slowing it down and causing temp of the brakes to increase

Question 7

The faster a vehicle travels, the greater the braking force needed to stop it in a certain distance, a greater breaking force = a greater deceleration. What are the dangers of a greater deceleration?

Answer 7

.brakes may overheat
.driver can lose control of the vehicle