I have a small dilemma with a statics problem that isn't really static... I have been asked to design a grip for a tensile testing machine specifically for rubber that will supply up 1kN of force through the rubber I have chosen aluminium to make the main body of the grip and will be driven pneumatically. I have gone for a grip design of two flat plates that will hold the rubber in place. One grip would be stationary at the bottom of the test piece and the other would be moving at about 1cm/s gripping the top of the test piece. The test piece is in a dumbbell format according to standards and the test piece will weigh no more than 10 grams. Therefore, assuming a 0.5 coefficient between rubber and aluminium, is it a simple static problem and the force required to keep the rubber in place would be 2kN? Or do I have to treat the two systems independent of each other?