RECTILINEAR KINEMATICS: ERRATIC MOTION
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- Frederica Arnold
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1 RECTILINEAR KINEMATICS: ERRATIC MOTION Today s Objectives: Students will be able to: 1. Determine position, velocity, and acceleration of a particle using graphs. In-Class Activities: Check Homework Reading Quiz Applications s-t, v-t, a-t, v-s, and a-s diagrams Concept Quiz Group Problem Solving Attention Quiz
2 READING QUIZ 1. The slope of a v-t graph at any instant represents instantaneous A) velocity. B) acceleration. C) position. D) jerk. 2. Displacement of a particle in a given time interval equals the area under the graph during that time. A) a-t B) a-s C) v-t C) s-t
3 APPLICATION In many experiments, a velocity versus position (v-s) profile is obtained. If we have a v-s graph for the tank truck, how can we determine its acceleration at position s = 1500 feet?
4 ERRATIC MOTION (Section 12.3) Graphing provides a good way to handle complex motions that would be difficult to describe with formulas. Graphs also provide a visual description of motion and reinforce the calculus concepts of differentiation and integration as used in dynamics. The approach builds on the facts that slope and differentiation are linked and that integration can be thought of as finding the area under a curve.
5 S-T GRAPH Plots of position vs. time can be used to find velocity vs. time curves. Finding the slope of the line tangent to the motion curve at any point is the velocity at that point (or v = ds/dt). Therefore, the v-t graph can be constructed by finding the slope at various points along the s-t graph.
6 V-T GRAPH Plots of velocity vs. time can be used to find acceleration vs. time curves. Finding the slope of the line tangent to the velocity curve at any point is the acceleration at that point (or a = dv/dt). Therefore, the acceleration vs. time (or a-t) graph can be constructed by finding the slope at various points along the v-t graph. Also, the distance moved (displacement) of the particle is the area under the v-t graph during time t.
7 A-T GRAPH Given the acceleration vs. time or a-t curve, the change in velocity ( v) during a time period is the area under the a-t curve. So we can construct a v-t graph from an a-t graph if we know the initial velocity of the particle.
8 A-S GRAPH A more complex case is presented by the acceleration versus position or a-s graph. The area under the a-s curve represents the change in velocity (recall a ds = v dv ). ½ (v 1 ² v o ²) = s 2 s a ds 1 = area under the a-s graph This equation can be solved for v 1, allowing you to solve for the velocity at a point. By doing this repeatedly, you can create a plot of velocity versus distance.
9 V-S GRAPH Another complex case is presented by the velocity vs. distance or v-s graph. By reading the velocity v at a point on the curve and multiplying it by the slope of the curve (dv/ds) at this same point, we can obtain the acceleration at that point. Recall the formula a = v (dv/ds). Thus, we can obtain an a-s plot from the v-s curve.
10 EXAMPLE Given: The s-t graph for a sports car moving along a straight road. Find: The v-t graph and a-t graph over the time interval shown. What is your plan of attack for the problem?
11 EXAMPLE (continued) Solution: The v-t graph can be constructed by finding the slope of the s-t graph at key points. What are those? when 0 < t < 5 s; v 0-5 = ds/dt = d(3t 2 )/dt = 6 t m/s when 5 < t < 10 s; v 5-10 = ds/dt = d(30t 75)/dt = 30 m/s v(m/s) 30 v-t graph t(s) 5 10
12 EXAMPLE (continued) Similarly, the a-t graph can be constructed by finding the slope at various points along the v-t graph. when 0 < t < 5 s; a 0-5 = dv/dt = d(6t)/dt = 6 m/s 2 when 5 < t < 10 s; a 5-10 = dv/dt = d(30)/dt = 0 m/s 2 a(m/s 2 ) 6 a-t graph t(s) 5 10
13 CONCEPT QUIZ 1. If a particle starts from rest and accelerates according to the graph shown, the particle s velocity at t = 20 s is A) 200 m/s B) 100 m/s C) 0 D) 20 m/s 2. The particle in Problem 1 stops moving at t =. A) 10 s B) 20 s C) 30 s D) 40 s
14 GROUP PROBLEM SOLVING Given: The v-t graph shown. Find: The a-t graph, average speed, and distance traveled for the 0-90 s interval. Plan: Find slopes of the v-t curve and draw the a-t graph. Find the area under the curve. It is the distance traveled. Finally, calculate average speed (using basic definitions!).
15 Solution: GROUP PROBLEM SOLVING (continued) Find the a t graph: For 0 t 30 a = dv/dt = 1.0 m/s² For 30 t 90 a = dv/dt = -0.5 m/s² a(m/s²) 1 a-t graph t(s) -0.5
16 GROUP PROBLEM SOLVING (continued) Now find the distance traveled: s 0-30 = v dt = (1/2) (30) 2 = 450 m s = v dt = (1/2) (-0.5)(90) (90) (1/2) (-0.5)(30) 2 45(30) = 900 m s 0-90 = = 1350 m v avg(0-90) = total distance / time = 1350 / 90 = 15 m/s
17 ATTENTION QUIZ 1. If a car has the velocity curve shown, determine the time t necessary for the car to travel 100 meters. v A) 8 s B) 4 s 75 C) 10 s D) 6 s 6 s t 2. Select the correct a-t graph for the velocity curve shown. a a v A) t B) t a a C) t D) t t
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