PHY 102 1st EditionOutline of Last LectureI. Uniformly Accelerated Motiona. Exampleb. Y InterceptII. Equations of MotionIII. Steps of solving kinematic problemsIV. Graphs of Motiona. Constant motionb. Uniformly Accelerated MotionOutline of Current Lecture I. First law of motiona. Newton’s first lawb. Lawc. AristotleII. QuestionsIII. Types of ForcesIV. Where Aristotle went wrongV. Momentum and InertiaCurrent LectureI. First Law of MotionThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.a. Known as Newton’s first law even though Galileo discovered itb. A body at rest will stay at rest, and a body in motion will stay in motion with constant velocity along a straight linei. Without acting forces1. External2. Frictionalii. MISCONCEPTION: objects need a constant source of force to keep them inthe same state of motion1. This is only true in the presence of frictionc. Objects “desire” rest according to Aristotle i. This is why he proposed that angels moved the heavenly bodies.1. Aristotle thought the flight of an arrow was due to the arrow pushing air out of the way and then the air pushing the arrow along in the empty space created.d. Associated with constant velocity unless acted upon by an outside forceII. Questionsa. When an object is moving with a fixed velocity, is it accelerating? NO!b. When an object is moving with a fixed speed, is it accelerating? MAYBE! If there is a change in direction, yes.c. If a car is moving at a constant speed of 60 mph as it turns a corner, is it accelerating? YES!III. Types of forcesa. External – someone pushing a ball forwardb. Friction – road against the tires of a car or bearings in a carc. Sound is a loss of energy into the air – will cause the object to slow downIV. Where Aristotle went wronga. Like rest, motion is a natural state for a body not experiencing frictionb. A projectile is not left behind beause it has forward motion of its ownc. The air is carried along with the spinning earthd. The state of physics knowledge in early times was comparatively limitede. When something is moving forward, it shares in the forward motioni. Tossing a pen in an airplaneii. Objects inside of a carf. Projectile motioni. When a plane releases a bomb, the bomb shares in the forward motion ofplaneii. Must accommodate for the forward motion when releasing a projectileV. Momentum and Inertiaa. Momentum (p) is a vector quantity associated with both mass (arbitrarily defined) & velocityi. P = mv (units typically kg *m/sii. The momentum of an object at rest is zero.b. Inertia should not be confused with momentum; inertia is a body’s tendency to resist changes in motion, non-mathematicalc. normal force – force of the surface upwards on the objectVI. Objects at resta. Can have an accelerationi. Throwing an object in the air – its speed reaches 0 but gravity (9.81 m/s^2) is still appliedb. Inertia is proportional to the mass – NOT a numerical value.i. Only associated with massii. Ability to resist a change in motioniii. If something is more massive, it has more inertiac. Does the weight of the object at rest change? Yes. The mass is constant but the force of gravity upon it