Recitation Worksheet C Solutions

Recitation Worksheet C Solutions - Worksheet C: 1D motion...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Worksheet C: 1D motion 1. The following graph describes the motion of a toy train. It starts moving forwards. a. The speed of the train is zero at t = 0, 8 s and 16 s b. When does the train move forwards? 0 < t < 8 s (when v > 0) c. When does the train move backwards? 8 s < t < 16 s (when v < 0) d. When does the train speed up? 0 < t < 2 s ( v>0 and a>0 ) and 8 s < t < 10 s ( v<0 and a<0 ) e. When does the train travel at constant speed? 2 s < t < 4 s f. At t = 6 s, the acceleration is a = 2 04 m / s 1 m/s 4 s v a t == = (slope of v-t curve) v x (m/s) 2 4 6 8 10 12 14 16 4
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
(Worksheet C) g. At t = 8 s, the acceleration is a = 2 1 m/s a =− (same slope) h. At t = 16 s, the instantaneous acceleration is a i = Draw the tangent line to the curve at t = 16 s. From the figure, this line goes (more or less) through (t, v) = (16 s, 0) and (14 s, -2 m/s). Thus, 2 0(2 ) m / s slope of tangent line 1 m/s 16 s 14 s a − − == = i. The average acceleration between t = 10 and t = 16 s is a average = 2 average ) m / s 0.3 m/s 16 s 10 s v a t ∆− = j. Estimate the total displacement of the train.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This homework help was uploaded on 03/27/2008 for the course PHYS 221 taught by Professor Herrera-siklody during the Fall '08 term at Iowa State.

Page1 / 5

Recitation Worksheet C Solutions - Worksheet C: 1D motion...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online