ENGINEERING MECHANICS DYNAMICS COMPREHENSIVE EXAM SCRIPT VERIFIED QUESTIONS AND SOLUTIONS GRADED APLUS

ENGINEERING MECHANICS DYNAMICS
COMPREHENSIVE EXAM SCRIPT VERIFIED
QUESTIONS AND SOLUTIONS GRADED
APLUS

●● What is coloumbs law
Answer: frictional force is proportional to normal force upto a certain
point


F = Us N


●● what is delta r
Answer: how far and in what direction the particle moved from start to
end


●● whats r
Answer: initial position vector


●● whats r'
Answer: final position vector


●● how to calculate average velocity

,Answer: change in position vector / change in time


●● what direction is positive for velocity
Answer: right


●● How do you calculate average speed
Answer: total distance/total time


●● how do you find instantaneous velocity
Answer: dr / dt


●● how do u find speed
Answer: ds / dt


●● whats average acceleration
Answer: v / t


●● Whats formula for instantaneous acceleration
Answer: dv / dt


●● how to know if velocity is positive
Answer: right is positive

, left is negative


●● when you differentiate position with time once what do u get vs
when u do it twice
Answer: once u get velocity


twice u get acceleration


●● What are the kinematic equations for constant acceleration
Answer: 1. v = v0 + (ac)(t)


2. s = s0 +v0 + 1/2(ac)(t^2)


3. v^2 = (v0)^2 + 2(ac)(s-s0)




ac = constant accleleration


●● what does it mean when the acceleration is constant
Answer: its only one number the whole time