Principles of Steering (Continued)

13 What other safety system has been added to a steering columns and what happens in a front end collision ?
Air bags, when the car has a front end collision air bags sensors will trigger and deploy the air bags before you even blink 
14 What is the purpose of a control arm?

15 What is the purpose of the flexible joint that connects the imput shaft to the steering box ?
it allows alignment of the column to the steering wheel box .
16 How many control arms can a front suspension have ?
1 or 2
17 What type of front suspension has 2 control arms ?
parallel front suspension 
18 What does a pan hard rod do ?
to restrict lateral movement of the rear axle during cornering 
19 What are the purpose of bushes in a suspension system ?
act as bearing and suspension fulcrum points to allow for movement of the component while maintaining its alignment
20 What materials can bushes be made from ?
rubber, metallic, metalastic
21 What is the point of ball joints in the steering and suspension ?
as the  suspension and steering deflects, they let the control arms move up and down and lets the wheel and hub assembly turn for the steering wheel.