Download presentation

Presentation is loading. Please wait.

Published byEfren Ballam Modified over 2 years ago

1
Notes: d vs. t graphs E.Q.: How do position-time graphs tell us about velocity?

2
Zero slope = zero velocity positive slope = positive velocity negative slope = negative velocity = moving opposite way steeper slope (up or down) = higher speed Straight line = constant velocity position time slope = velocity

3
Notes: Velocity11/18 EQ: How do we calculate velocity?

4
in a direction. Velocity is speed in a direction. If speed or direction changes, velocity changes. If speed or direction changes, velocity changes.

5
Velocity … is the rate of change in position. v = Δd / Δt …or… (d 2 -d 1 ) (t 2 -t 1 ) v =

6
Example: A pumpkin is shot straight up from 5.m high to 85m high in 4.0 seconds. What was the pumpkin’s average velocity? Δd / Δt v avg = Δd / Δt (d 2 -d 1 ) / (t 2 -t 1 ) = (d 2 -d 1 ) / (t 2 -t 1 ) (85m – 5.0m)/(4.0s – 0s) v avg = (85m – 5.0m) / (4.0s – 0s) 80.m/4.0s = 80.m / 4.0s m/s upwards v avg = 20. m/s upwards

7
Example: Jared looks out his window and sees the pumpkin falling from 75 meters high 5.0 seconds after it was shot to 35 m high 7.0 seconds after it was shot upwards. What was the average pumpkin velocity observed by Jared? Δd / Δt = (d 2 -d 1 ) / (t 2 -t 1 ) v avg = Δd / Δt = (d 2 -d 1 ) / (t 2 -t 1 ) (35m – 75m)/(7.0s – 5.0s) v avg = (35m – 75m) / (7.0s – 5.0s) 40.m/2.0s v avg = 40.m / 2.0s m/s upwards v avg = - 20. m/s upwards …or… 20 m/s downwards

8
Average vs. Instantaneous Instantaneous = at one point in time Average = the mean value Average = the mean value… total distance / total time Average speed or velocity tells us nothing about speed in the middle. Example: 60 mph Everett Lynnwood, 20 mph Lynnwood Shoreline… 20 mph Lynnwood Shoreline… V avg = 30 mph.

Similar presentations

OK

Chapter 11 Motion. Position Position- a place or location –Positions may be described differently by the groups, but the distance/displacement is the.

Chapter 11 Motion. Position Position- a place or location –Positions may be described differently by the groups, but the distance/displacement is the.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on ecology and ecosystem Ppt on rc coupled amplifier Ppt on business plan for wound care Download ppt on life process for class 10 cbse all 10 Ppt on crash fire tender picture Ppt on union budget 2013-14 of india Ppt on water activity symbol Free ppt on sources of finance Ppt on etiquette and manners Ppt on cross site scripting internet