Biophysics I Lecture Notes PDF

Biophysics I BSG 1108 Lec 1, level 1, physical therapy By Dr. ANAS AGAMIA 24/25  Course Instructor Dr. ANAS AGAMIA Stuff assistance : Saeed Ali Aml alsoudi Esraa Draz Lab ...

Biophysics I BSG 1108 Lec 1, level 1, physical therapy By Dr. ANAS AGAMIA 24/25  Course Instructor Dr. ANAS AGAMIA Stuff assistance : Saeed Ali Aml alsoudi Esraa Draz Lab  Lecture Hrs Tutorial/ Week Topic Description Practical Hrs Statics, Force, Torque, and equilibrium. 1 Measurement of short length using caliper. 2 2 Course Contents 2 Center of mass and Stability. Simple Pendulum. 2 2 Levers in the body and its mechanical advantages. 3 Hooke’s Law. 2 2 Temperature, heat and metabolic rate. 4 2 2 Therapeutic Heat and Cold in medicine and Temperature measurement. 5 Calibration of a thermocouple. 2 2 6 Measurement of the specific heat of water. 2 2 Charge and electrostatic forces. 7 Ohm’s law. 2 2 8 Midterm Exam (MT) ------ ------ Electric field and its application. 9 Mapping of electric fields. 2 2 Capacitors and Dielectrics and the application of RC circuit. 10 2 2 Determination of time constant of RC circuit. Bioelectricity and nerve impulse across the cell membrane. 11 Measurement of the approximate length of an Oleic acid molecule. 2 2 Effect of temperature on the cell membrane. 12 2 2 Electrical signals, EMG, ECG, EEG, ERG, EOG, recorded from the body. 13 Lab Revision and final Lab quiz. 2 2 14 Practical/Oral Exam (Pract) ----- ------ 15 Final Written Exam (Final) ------ ------ “Biophysics”  Link Between Physics Biology Importance of Biophysics in Medicine ? You cannot see a force but you can see what it does. You can also feel the effect of a force in your body. A force is a push or a pull experienced by an object. Vectors Vectors are represented with arrows proplem 1. Find the components of a 300-N force acting along the handle of a lawn-mower. The angle with the ground is 32 ? Fx = ? Fy = ? Assignment 20 Proplem : Resolving forces ? Calc. W Calc. F2 Calc. T1 T2  Moments of forces The moment of a force is a measure of the turning effect of the force about a point The moment depends on the following: 1. Magnitude of the applied force 2. Distance from point of application to pivot (location of applied force) 3. Angle ( direction of the applied force) moment of a force is not the same thing as force. moment of a force For rotational motion moment of a force = F.d sin   Torque A torque is an action that causes objects to rotate. Torque is not the same thing as force. For rotational motion, the torque is related to the rotational motion, not the force. Torque is created when the line of action of a force does not pass through the center of rotation. Torque is determined by (3) factors 1. Magnitude of the applied force 2. Distance from point of application to pivot (location of applied force) 3. Angle ( direction of the applied force) Example : An 80-N force acts at the end of a 12-cm wrench as shown. Find the torque ? EX. 3 cm EX EX. Calc. Torque Ex: Calc. total torque center of rotation Two conditions for a rigid body to be in static equilibrium: 1. Translational equilibrium: The net force on the rigid body must be zero :Σ𝑭=𝟎 2. Rotational equilibrium : The net torque on the rigid body about any point must be zero: Σ 𝝉=𝟎