A moving object has...
Speed
Momentum
Gravity
Momentum =
Mass x Velocity
Mass ÷ Velocity
Velocity ÷ Mass
Mass + Velocity
To reduce injuries, forces should be as small as possible.
Force =
Change in Momentum ÷ Time
Mass x Acceleration
Time ÷ Change in Momentum
Speed x Distance
Spreading the momentum change over a short period of time reduces the force.
What do crumple zones do?
Change shape
Stretch
Inflate
How do seatbelts reduce injury?
They stretch and convert the persons kinetic energy into elastic energy.
They stretch and stop the person hitting their head on anything.
They stop you're organs hitting your ribcage.
What to air bags increase?
the time taken for the head's momentum to reach zero
the space in the car
the force
ABS stands for?
Anti-lose braking system
Anti-lock braking system
Anti-lock braking section
Anti-lock bump system
ABS prevents?
skidding
cars overturning
damage to the car
Traction control - prevents skidding while accelerating so the car can quickly escape a dangerous situation.
