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PHYS 101 Exam 1 Study Guide

by: Jay Ko

PHYS 101 Exam 1 Study Guide PHYS 101

Marketplace > Rice University > Physics > PHYS 101 > PHYS 101 Exam 1 Study Guide
Jay Ko
Rice University
GPA 3.8

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PHYS 101 Exam 1 Study Guide
Dr. Jason Hafner
Study Guide
exam, 1, Physics, projectile, motion, vectors
50 ?





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This 9 page Study Guide was uploaded by Jay Ko on Saturday September 24, 2016. The Study Guide belongs to PHYS 101 at Rice University taught by Dr. Jason Hafner in Fall 2016. Since its upload, it has received 10 views. For similar materials see MECHANICS (WITH LAB) in Physics at Rice University.

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Date Created: 09/24/16
PHYS 101 – Mechanics – Dr. Jason Hafner & Dr. Brian Padley – Exam 1 Study Guide Ch. 1 • Dimensions + Units o There are three basic units o SI System Dimension Unit Length m (meter) Time s (seconds) Mass Kg (kilograms) • Scientific Notation o Ex. # of stars in the universe § § Ch. 2 Kinematics • Kinematics – Describing of motion of objects using equations, plots, and graphs o 1-D Kinematics = motion on a line § Ex. Motionless object § Ex. Ball moving steadily along the x-axis • Define displacement (vector quantity) – vectors need a magnitude and direction o § xfis x at f § xiis x at i • Define average velocity o § Ex. What if v is not constant? -L.K. 8.27.16 PHYS 101 – Mechanics – Dr. Jason Hafner & Dr. Brian Padley – Exam 1 Study Guide • Ex. What if motion has two different velocities • • • • Distance: The total length of the actual path (scalar) • Speed: Distance divided by the time interval Δt o Average speed: o Average velocity: o Ex. Katie Ledecky won the 800m freestyle in 8:04 or 484s § Finish = the start position § Vavg = Δx/Δt = 0/484s = 0m/s § Avg. speed = 800m/484s = 1.65m/s o Ex. Two objects § Two people, person A and person B. -L.K. 8.27.16 PHYS 101 – Mechanics – Dr. Jason Hafner & Dr. Brian Padley – Exam 1 Study Guide § V A V aBd at some time or point on x, A will meet B. … • Complicated position vs. t plot o Recall that -L.K. 8.27.16 PHYS 101 – Mechanics – Dr. Jason Hafner & Dr. Brian Padley – Exam 1 Study Guide § Allow t to get very small § Instantaneous velocity: § Instantaneous speed: • Magnitude of Vx • Ex. 1-D Constant Velocity, Vi o Velocity at any time t=constant velocity: o Recall that: § Velocity is the rate of change of displacement with respect to time § Acceleration is the rate of change of velocity with respect to time § Average Acceleration: • Ex. Ball rolling down an incline, assuming positive x is down the incline and zero at the top o Plot x vs. t, v vs.t, a vs. t. o § Parabolic for constant acceleration -L.K. 8.27.16 PHYS 101 – Mechanics – Dr. Jason Hafner & Dr. Brian Padley – Exam 1 Study Guide o § average acceleration = (delta)x/(delta)t o § Constant acceleration • Ex. John Strapp o Accelerated from rest to 632mph in 5 seconds. § § o Deceleration § Given: From 282.5m/s to 0m/s in 1.4s. § • Ex. Roll ball up an incline (then it rolls back down) -L.K. 8.27.16 PHYS 101 – Mechanics – Dr. Jason Hafner & Dr. Brian Padley – Exam 1 Study Guide o § At the peak, slope is 0 and thus velocity is 0. § Left side, positive slope and decreasing (velocity is positive but getting smaller) § Right side, negative slope and increasing (velocity is negative and getting more negative) o § Area under the curve = (delta)x for (delta)t o § Constant negative acceleration • Instantaneous Acceleration -L.K. 8.27.16 PHYS 101 – Mechanics – Dr. Jason Hafner & Dr. Brian Padley – Exam 1 Study Guide o o 2 • Ex. x(t)=a+bt+ct o Let’s say x in m = m, m/s, m/s2 o o o • Simple Kinematic Equations o o o o -L.K. 8.27.16 PHYS 101 – Mechanics – Dr. Jason Hafner & Dr. Brian Padley – Exam 1 Study Guide 8.31.16 • Freely Falling Objects 2 o Close to surface gravitational acceleration g=9.8m/s and is nearly constant (ignoring air resistance) • Ex. Tossing ball into the air o o o § g=-9.8m/s 2 rd • Ex. Imagine your friend on the 3 flood of a building, and you toss a drink up to him from below, straight up. Find the minimum velocity when leaving hand. 8.27.16 PHYS 101 – Mechanics – Dr. Jason Hafner & Dr. Brian Padley – Exam 1 Study Guide • • • • -L.K. 8.27.16


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