Part A
I learned that the study of dynamics goes beyond the relationships between the variables of motion as explained in kinematics. Dynamics uses Newton's 3 laws of motion, Newtons law of universal gravitation, and Kepler's laws of planetary motion. It also uses the law of conservation of momentum and centripetal force of center-seeking objects. I learned that friction is a force that opposes the motion of one object sliding over the surface of another object. I learned that in order to better understand the relationship between force and acceleration in a particular case it is helpful to use a free-body diagram. I learned that mass and what are two different physical quantities.
Part B
One application of dynamics is how a seat belt works.
Inertia is an object's tendency to keep moving until something else works against this motion. Anything that is in the car has a separate inertia from the car. The car accelerates riders to its speed. So if the car crashes into a telephone pole at 50 mph and the driver is not wearing a seat belt, then the driver would either slam into the steering wheel at 50 mph or fly out the windshield at 50 mph. If the driver wears their seat belt, then the seat belt will spread the stopping force to across sturdier parts of the driver's body. Wearing a seat belt can save a person's life.
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