stopping and breaking

Question 1

what is stopping distance

Answer 1

thinking + braking distance

Question 2

what is thinking distance

Answer 2

distance travelled during driver’s reaction time

Question 3

what is braking distance

Answer 3

distance travelled under the braking force

Question 4

for a given braking force:

Answer 4

greater the speed, the longer the stopping distance

Question 5

what’s the typical human reaction time

Answer 5

0.4-0.9 seconds

Question 6

factors that cause a driver to react more slowly will ______________ the reaction time and therefore________ increase the overall stopping distance

Answer 6

increase

increase

Question 7

what affects thinking distance

Answer 7

age 
lack of concentration
tiredness
alcohol 
distraction

Question 8

what affects breaking distance

Answer 8

• if car is poorly maintained
• driving too fast
• conditions of road
• adverse weather conditions (wet, icy)

Question 9

greater the braking force, _______ the deceleration of the vechile

Answer 9

greater

Question 10

what causes an increase in temp of brakes

Answer 10

-work done by frictional force transfers kinetic energy of vehicle into heat energy

Question 11

if braking force it too large, what might happen?

Answer 11

-brakes may overheat and tyres may lose traction on road, resulting in vehicle skidding

Question 12

for a given braking distance:

Answer 12

• doubling mass doubles force required

- doubling apples quadruples force required

Question 13

work done (kinetic energy) equation

Answer 13

force x braking distance