8.5 Vehicle Safety Flashcards
1
Q
When a vehicle hits a wall at an acceleration of -30 what is the g
A
-3g
So the impact force of the wall must have been 3 times its weight =3mg
2
Q
What does a shorter contact time mean
A
Greater impact force for the same initial velocities of the two objects
3
Q
When happens when 2 vehicles collide and stick together
A
They exert forces on eachother until they are moving at the same velocity
The duration of the impact force is not the same as the contact time in this situation
4
Q
How is impact time t (duration of the impact force) worked out for objects that don’t stick together
A
S = 1/2(u+v) t
5
Q
The acceleration =
A
a = v-u/t
6
Q
The impact force =
A
F=ma
7
Q
A
