How can actin polymerization generate force

Question

Problem:

Describe the answer of the following questions:

Question 1: How many ATP molecules are made after the aerobic respiration and what is the net energetic gain of the process?

Question 2: How can actin polymerization generate force?

Question 3: How can we measure and perturb actin polymerization in vivo?

Question 4: How can we measure and perturb actin polymerization in vivo?

Please explain in detail.