Motion, Velocity, and Acceleration - Book M, Chap. 1.1

transcript

Warm-UpAug. 24,2011

Identify at least 3 moving objects that you can observe from your seat.

Reference Points Tour

Object in Motion Reference Point

Warm-UpAug. 25,2011

How could we connect this to moving objects and reference points?

Measuring MotionChapter 1, Section 1

Determining Speed

Who’s Faster?

100 meters 10 seconds

Who’s Faster?

Speed = distance/time

= 180m 10 s

= 160m 8 s

Who’s Faster?

= 180m 10 s

= 160m 8 s

18 m/s

20 m/s

Speed or Velocity?Speed –

the rate at which an object moveshow fast an object moves15 m/s (meters per second)

Velocity – an object’s speed in a specific direction

how fast AND which way an object moves

5 m/s north

Speed or Velocity?20 m/s -

17 m/s east -

100 m/s up –

0.15 m/s -

Velocity

Formula Triangle

Warm-UpAug. 26,2011

Fill in the triangle with the formula for speed.

What is the velocity of a car that traveled 252 miles East in 4

hours?

Speed = Distance/Time

What is the velocity of a car that traveled 252 miles E in 4

hours?

Distance 252 mi. = Time 4 hr.

63 mph E

Acceleration

• Acceleration – The rate at which velocity changesA change in velocity

(Speed or Direction)

Examples:Speeding up- A plane taking offSlowing down- A car stopping at a red lightChanging direction – A car turning at a corner

Determining Acceleration

Acceleration = final velocity – initial velocity

Vf - Vi

Warm-UpAug. 29,2011

What two factors determine an object’s speed?

Practice Problem:What is the velocity of a runner traveling 35 meters North in 7

seconds?

Distance and Time

Speed = Distance Time

= 35 m 7 s

= 5 m/s

Graphing Velocity

Constant Velocity vs. Acceleration

Motion, Velocity, and Acceleration - Book M, Chap. 1.1

Education