What device is used to measure Ground Reaction Forces?

The graph below depicts anterior-posterior GRFs during running at three speeds. Which of the following is true: 

True or False: The work done during an eccentric contraction is positive work.

True or False: Increasing the area in contact between the two surfaces does not increase the coefficient of friction.

As the normal contact force increases, what happens to the friction force?

True or False: In the human body, net forces act on the Center of Mass.

This graph is an example of what  

Sequences of DNA that are identical when read from the 5′ to 3′ direction on one strand and the 3′ to 5′ direction on the other strand are_________.

A technique that separates a readable pattern of DNA fragments is_________.

Amplification of DNA is accomplished by_________.