Physics 101, week 2 notes continued
Physics 101, week 2 notes continued Physics 101
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This 2 page Class Notes was uploaded by Kate Worley on Thursday August 25, 2016. The Class Notes belongs to Physics 101 at University of Tennessee - Knoxville taught by Kranti Gunthoti in Fall 2016. Since its upload, it has received 9 views. For similar materials see How Things Work in PHYSICS (PHY) at University of Tennessee - Knoxville.
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Date Created: 08/25/16
Physics 101 Notes: 8/25 (Week 2 continued) Force o Defined as a push or a pull, and is a vector quantity, meaning that it has direction depending on which way it is being pushed or pulled o It has amount and direction (how much force is being applied and in which direction it is moving) Newton’s First law o First draft: “an object that is free of forces move in a straight line and covers equal distances in equal time” o Final: “an object that is free of external forces moves at a constant velocity” How does a skater start, stop, or turn? o Acceleration: “the rate at which an object’s velocity is changing with time o Acceleration, similar to force, has both amount and direction (vector quantity) due to the force at which it is accelerating and the direction it is travelling o Accelerating forward is the change of velocity in the direction of velocity o Accelerating backward is the accelerating in the opposite direction of the velocity o When you start, you are choosing a certain direction and accelerating; if you stop, you are already carrying a constant speed and then must go the opposite way of the velocity; turning is accelerating to the side, neither towards the direction or opposite of it Acceleration and net force o Net force is the sum of all of the combined forces affecting an object, which creates acceleration ( F1+F2) o Acceleration is correlated with an object’s net force; the greater the force being applied to an object, the greater the acceleration o If an object is large, it must be acted on by a larger net force to achieve a greater acceleration. Similarly, if the object is small, it requires a smaller net force in order to achieve acceleration. Acceleration and mass o Mass is the resistance to a change in motion, or inertia. It measures the difficulty to move an object. If an object is larger, it will be harder to move, allowing us to conclude that it has a greater mass o Acceleration is inversely correlated to the mass, because the larger the object, the more inertia must be applied and less acceleration. (A= 1/mass) Newton’s second law of motion o “Acceleration=net force/mass” (a=F/m) o The amount of force that is applied on an object is equal to the object’s mass, times the speed at which the object is accelerating (F=ma) o A net force of 20 N acts on a 5 kg block. What is the acceleration? A=f/m. a= 20n/5kg. A=4 m/s^2 One newton= kg m/s^2 o If a second object identical to the first is placed on top, what is the acceleration with a 200 N force A=f/m 200 kg m/s^2/80 kg = 2.5 m/s^2 o A 5 kg block is pulled by a horizontal force of 40 N with a frictional force of 8 N opposing the motion. Calculate the acceleration. Fh-Ffr 40 N- 8 N= 32 N (net force) a=f/m a=32 N/5kg = 6.4 m/s^2
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