8.5- VEHICLE SAFETY Flashcards
What can the effect of a collision on a vehicle be measured in terms of?
acceleration or deceleration of vehicle
What can be easily related by expressing acceleration/deceleration in terms of g, acceleration due to gravity?
force of impact can easily be related to weight of vehicle
Example of expressing acceleration/deceleration in terms of g? acceleration is -390ms^-2
in terms of g, acceleration = -3g
If the acceleration is -3g, what is the impact force like?
impact force on wall on vehicle must have been 3 times its weight
What happens for a certain time when objects collide + bounce off each other?
they’re in contact with each other for a certain time, which is same for both objects
When objects collide + bounce off each other, what happens to impact force the shorter the contact time?
shorter the contact time, greater the impact force for same initial velocities of the two objects
What may or may not two vehicles that collide do?
may or may not separate from each other after collision
What happens when two vehicles collide and do not separate?
exert forces on each other until they’re moving at same velocity
Is the duration of the impact force the same as the contact time in a situation where two vehicles collide and do not separate?
no
Equation for impact time?
t = 2s / u + v
Equation for acceleration?
a = v - u / t
Equation for impact force?
F = ma
