Download presentation

Presentation is loading. Please wait.

Published byBernadette Singleton Modified over 3 years ago

1
Ch. 2

2
Motion is Relative Think about how fast you are moving when walking inside of a plane compared to walking across campus…

3
Speed A measure of how fast an object is moving Measured using distance covered in a unit of time speed = distance / time s = d/t

4
Instantaneous Speed = speed at a particular instance Average Speed = average speed during a trip average speed = total distance covered time interval

5
Velocity ( v ) Speed in a given direction v = d/t Velocity = distance covered per unit time What are the requirements for Constant Velocity? What are the requirements for Changing Velocity?

6
Velocity Speed in a given direction What are the requirements for Constant Velocity? Requires BOTH constant speed and direction What are the requirements for Changing Velocity? – Changing speed – Changing direction OR BOTH!!!!!

7
Acceleration (a) The rate at which velocity is changing a = v t

8
Acceleration (a) The rate at which velocity is changing a = v = v final – v initial tt

9
Problem Solving Strategies Memorize the variables that are given in each equation!!!! – example: v = velocity Know the units for a given variable – example: velocity is measured in units of distance over time (meters per second or m/s)

10
Journal Velocity (v) v = d/t Units: m/s Acceleration (a) a = v f -v i t Units: m/s 2

11
Journal: Problem Solving Practice 1. You ride a bike a distance of 6 m in 2 s. What is your speed?

12
Problem Solving Practice 1. You ride a bike a distance of 6 m in 2 s. What is your speed? s = d/t

13
Problem Solving Practice 1. You ride a bike a distance of 6 m in 2 s. What is your speed? s = d/t s = 6 m/ 2s

14
Problem Solving Practice 1. You ride a bike a distance of 6 m in 2 s. What is your speed? s = d/t s = 6 m/ 2s s = 3 m/s

15
2. A car moving in a straight line increases its speed from 70 km/h to 75 km/h in 5 seconds. What is the acceleration of the vehicle? a = v/t

16
2. A car moving in a straight line increases its speed from 70 km/h to 75 km/h in 5 seconds. What is the acceleration of the vehicle? a = v/t a = 75 – 70 5

17
2. A car moving in a straight line increases its speed from 70 km/h to 75 km/h in 5 seconds. What is the acceleration of the vehicle? a = v/t a = 75 – 70 = 5 = 1 km/ h s 5 5

18
3. You yell across a canyon and you hear your echo return 6.5 s later. Assuming that the speed of sound in air is 340 m/s. How wide is the canyon at this location? equation:

19
3. You yell across a canyon and you hear your echo return 6.5 s later. Assuming that the speed of sound in air is 340 m/s. How wide is the canyon at this location? equation: v = d/t rearrange to get d = v t Since we are solving for the width…..

20
3. You yell across a canyon and you hear your echo return 6.5 s later. Assuming that the speed of sound in air is 340 m/s. How wide is the canyon at this location? equation: v = d/t rearrange to get d = v t Since we are solving for the width, not the entire journey, we need to only use half the time. Plug and Chug

21
3. You yell across a canyon and you hear your echo return 6.5 s later. Assuming that the speed of sound in air is 340 m/s. How wide is the canyon at this location? equation: v = d/t rearrange to get d = v t Since we are solving for the width, not the entire journey, we need to only use half the time. d = (340 m/s) (3.25 s) = 1105 m

22
More Practice 4. What is the acceleration of a car moving in a straight path that increases its speed from 5 km/h to 17 km/h in 3 seconds? 5. By how much does the speed of a vehicle moving in a straight line change each second when it is accelerating at 3 km/h s? 6. Calculate the average speed of a skateboarder that covers 20 m in 5 seconds?

23
More Practice 4. What is the acceleration of a car moving in a straight path that increases its speed from 5 km/h to 17 km/h in 3 seconds? 4 km/h s 5. By how much does the speed of a vehicle moving in a straight line change each second when it is accelerating at 3 km/h s? 3 km/h 6. Calculate the average speed of a skateboarder that covers 20 m in 5 seconds? 4 m/s

24
Begin Ch. 2 Practice!

Similar presentations

Presentation is loading. Please wait....

OK

Motion Chapter 11.

Motion Chapter 11.

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on air pressure and wind system Ppt on blood stain pattern analysis research Ppt on agriculture and its types Ppt on personality development slides Ppt on history of cricket for class 9 Ppt on bluetooth communication ios Ppt on fire alarm system History of sociology ppt on slides Ppt on 9/11 terror attack impact on world economy Ppt on national education day 2016