4a

Question 1

translational motion, forces, work, energy, and equilibrium in living systems

Answer 1

• motion of any object can be described in terms of displacement, velocity, and acceleration
• objects accelerate when subjected to external forces
• at equilibrium when net force and net torque acting on them are zero
• aspects of motion can be calculated with the knowledge that energy is conserved, even though it may be converted into different forms
• energy for motion comes from the metabolism of fuel molecules but the energetic requirements remain subject to the same physical principles
• content (physical topics relating to living systems:
  ~ translational motion
  ~ forces
  ~ work
  ~ energy
  ~ equilibrium

Question 2

translational motion

phy

Answer 2

• units and dimensions
• vectors, components
• vector addition
• speed, velocity (avg and instantaneous)
• acceleration

Question 3

force

phy

Answer 3

• newton’s first law, inertia
• newton’s second law (F=ma)
• newton’s third law, forces equal and opposite
• friction, static and kinetic
• center of mass

Question 4

equilibrium

phy

Answer 4

• vector analysis of forces acting on a point object
• torque, lever arms

Question 5

work

phy

Answer 5

• work done by a constant force: W = Fd*cosx
• mechanical advantages
• work kinetic energy theorem
• conservatives forces

Question 6

energy of point object systems

phy

Answer 6

• kinetic energy = 1/2mv²; units
• potential energy
  ~ PE = mgh (gravitational, local)
  ~ PE = 1/2kx² (spring)
• conservation of energy
• power, units

Question 7

periodic motion

phy

Answer 7

• amplitude, frequency, phase
• transverse and longitudinal waves: wavelength and propagation speed