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Lecture 2

PHY 2020 Lecture 2: Chapter 2-3 notes

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PHY 2020

Chapter 2-3 Newton’s First Law of Motion- Inertia - Galileo stated that, if there is no interference with a moving object, it will keep moving in a straight line forever, no push, pull or force of any kinds is necessary. o In his experiment he concluded, ▪ Slope downward- speed increase ▪ Slope upward – speed decreases - Newton’s first law of motion- inertia: A body at rest wants to stay at rest. A body in motion wants to stay in motion. - A rocket into outer space, what keeps the rocket moving after the rocket is burned out and no longer pushing it forward, carries a space probe? o No air resistance in space so inertia keeps it moving. - Inertia isn’t a kind of force. It’s a property of all matter to resist changes in motion. - Equilibrium does not mean no forces are acting, but that the sum of all the force is equal to 0. Applied Force Net force 5 N -> 10 N  5 N -> 5 N 5N 10  - Figure 2.11: (a) The force due to gravity on Nellie is shown by the downward vertical vector. An equal and opposite vector is needed for equilibrium, shown by the dashed vector. (b) This dashed vector is a diagonal of a parallelogram defined by the green line. (c) Both rope tensions are shown by the constructed vectors. Tension is greater in the right rope, the one more likely to break. - A book is on a table, how is it at zero net force? o Gravity pulls it down, the table keeps it up (supporting force) o E.g. Figure 2.16: Man on scale - If you exert a horizontal 100 N force on a crate, and it slides along a factory floor at constant speed, then the friction between the crate and floor is o 100 N Clicker and Homework Questions 1. The synthesis of a large collection of information that contains well-tested and verified hypothesis about certain aspects of the world is known as a scientific Theory 2. If your automobile runs out of fuel while you are driving, the engine stops but you do not come to an abrupt stop. The concept that most explains why is Inertia 3. A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is About 30 m/s 4. A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. The best demonstrates that Inertia 5. In science, a theory is A synthesis of a large body of well-tested knowledge 6. Which of Newton’s law explains best why a motorist should buckle up First 7. If you exert a horizontal 100 N force on a crate, and it slides along a factory floor at constant speed, then the friction between the crate and floor is 100 N 8. Equilibrium does not mean no force are acting, but that the sum of all the forces is equal to 0 Chapter 3- Linear Motion - Are you currently moving? o Everything moves- even things that appear to be at rest. - What is the impact speed when a car moving at 100 km/h bumps into the rear of another car traveling in the same direction at 98 km/h? o 2
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