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Physics 6A Midterm 1 Study Guide

by: Annita Kasabyan

Physics 6A Midterm 1 Study Guide Physics 6A

Annita Kasabyan
GPA 3.577

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These notes cover the past few weeks of lecture and include some example problems as well. Hope this helps!
6A - Physics for Life Sciences Majors: Mechanics
Study Guide
Physics, koutroulakis, life, Science, motion
50 ?




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This 2 page Study Guide was uploaded by Annita Kasabyan on Thursday October 13, 2016. The Study Guide belongs to Physics 6A at University of California - Los Angeles taught by Koutroulakis in Fall 2016. Since its upload, it has received 27 views. For similar materials see 6A - Physics for Life Sciences Majors: Mechanics in PHYSICS (PHY) at University of California - Los Angeles.


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Date Created: 10/13/16
Physics 6A Midterm Study Guide 1. Distance vs. Displacement a. Distance: total distance travelled, regardless of direction b. Displacement: how far moved from starting point, regardless of path taken i. Vector ii. Relative to reference frame c. Example: An ant starts at x=20cm on a piece of graph paper and walks along the  x­axis to x=­20cm. It then turns around and walks back to x=­10cm. What is the  ant’s displacement and distance traveled? i. ­30 cm; 50 cm 2. Velocity vs. Speed a. Speed and velocity both measure how much distance we travel in the unit of time, except velocity takes into account the direction being traveled.  3. Acceleration describes how quickly we’re changing velocity, that is to say the rate  velocity changes with time a. Vector b. General equations for constant acceleration: i. v = v + at 0  2 ii. x = x 0+ v 0 + 1/2at iii. v  = v 0+ 2a(x – x ) 0 4. All objects fall with the same constant acceleration in empty space (ignoring air  resistance) due to gravity, g = 9.80 m/s 2 a. Example i. How far does a cannonball fall from the balcony of the leaning tower of  Pisa (50m) in 2s? 2 1. y = y  0 v t 0 1/2at 2 2 2. y = 0m + (0m/s)(2s) + ½(9.80m/s )(2s)  = 19.6m  b. When throwing a ball straight up, which of the following is true about its velocity  and its acceleration at the highest point in its path? i. Velocity is zero but acceleration is non­zero ii. If acceleration were zero, the ball would stay in the air 5. Projectile motion a. Projectile motion can be understood by analyzing the vertical and horizontal  components separately  i. x = v tx0 ii. y = ­1/2gt 2 b. What is the maximum distance (R) that a projectile can travel in the x­direction?  What should be the initial conditions to meet that? 2 i. R = v s0n2Ɵ/g ii. The projectile should be thrown at an angle of 45 in order to reach  maximum distance 6. Force is an action capable of changing the state of motion of an object 7. Newton’s first law of motion (law of inertia) a. An object in motion will stay in motion and an object in rest will stay in rest  unless acted upon by another force b. Inertia is the inherent tendency of an object to maintain its state of rest or constant velocity in a straight line c. Example i. A very large truck sits on a frozen lake. Assume there is no friction  between the tires and the ice. A fly suddenly smashes against the front  window. What will happen to the truck after the moment of the “crash”? 1. The truck will move backward at constant speed 2. It will be moving at constant speed because no other force will be  acting on it after the instant of the crash 8. Mass vs. Weight a. Mass is a measure of the inertia of an object. It is inherent to an object, regardless  of its location. (measured in kilograms) b. Weight is the force that earth exerts on an object of a certain mass (F=ma) 9. Newton’s second law of motion a. Acceleration of an object is directly proportional to the net force acting on it, and  inversely proportional to its mass b. Example i. Superman must stop a 30m/s train in 100m before it hits a car stuck on  5 t2acks.2What force must he exert, if the train has a mass of 10  kg? ii. v  = v 0+ 2a(x – x ) 0 iii. 0 = (30m/s)  + 2a(100m); a = ­4.5m/s 2 5 2 6 iv. F = (10 kg)(4.5m/s ) =  1.8x10    N  10. Newton’s third law of motion a. When an object exerts a force on another object, that object exerts an equal force  in the opposite direction 11. Normal force is what allows objects to “stand” on a surface a. Normal force changes depending on the other forces acting on it b. A box on an inclined surface has a smaller normal force acting on it than a box on a level surface; the steeper the incline, the less normal force there is c. The acceleration of an object at an incline: gsinƟ 12. Tension is the force exerted by ropes/cords/wires when we pull on them a. The force is equal and opposite at the two ends of the rope 13. Pulleys take advantage of the rope’s tension to help lift things easily


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