Car design and safety

Question 1

What do brakes reduce in a car

Answer 1

Kinetic energy

Question 2

How do brakes reduce kinetic energy on a car

Answer 2

Transfer it into heat and sound energy

Question 3

What do regenerative brakes do for a cars kinetic energy as opposed to traditional brakes

Answer 3

Put the motor in reverse so that the wheels are slowed

Question 4

Give 4 safety measures of a car

Answer 4

Crumple Zones
Side impact bars
Airbags
Seat belts

Question 5

What are crumple zones and how do they reduce injury

Answer 5

Crumple zones crumple on impact so that the kinetic energy is changed into other forms of energy involved in changing the shape of the car.
This increases the impact time and decreases the force acting on the people inside reducing injury

Question 6

What do airbags do to reduce injury

Answer 6

Slow you down gradually and prevents you hitting a hard surface inside the car

Question 7

What are side impact bars and what do they do to reduce injury

Answer 7

Strong metal tubes fitted into car door panels

Help to direct kinetic energy of the crash away from passengers to other areas such as crumple zones

Question 8

What do seatbelts do to prevent injury

Answer 8

Stretches slightly so that the time taken for the wearer to stop is increased reducing forces acting on the chest

Question 9

Why ate cars designed to be aerodynamic

Answer 9

So that their air resistance is minimised by air flows passing more smoothly and easily