1/22 & 1/23 - 8th Grade Agenda

Learning Objective: Learn about MotionCollect HW: Reading & Notetaking: p.153Chap 6,7 8 TestVideo: None of the AboveTextbook Reading p. 338 - 340HW: Reading & Notetaking p.156 - 157Reminder: Data Table, Graph & Procedure due 2/5 & 2/6 (15 Points)

Daily Reflection

• Prompt: Write 3 questions that you have about Physics

Are we in motion right now?

• We are traveling about 30 km per second (about 20 miles per second) right now!

• Earth orbits around the sun. Earth moves about 30 km every second.

• At that speed we will get to New York City in about 2 minutes

Can we feel speed?

• No.• You can’t feel the speed inside a fast moving car• You can’t feel the speed inside a passenger jet• You can’t feel the speed of earth moving around

the sun.• What are we really feeling inside a moving

car?• We only feel the acceleration.

Why is a reference point important?

• Because it is used for comparison to determine if something is in motion

Difference between Distance and Displacement

• Distance is the total length of the actual path between two points.

• Displacement is the length and direction of a straight line between starting and ending points.

What is a Vector

• A quantity that consists of both a magnitude and a direction is called a vector.

What is the International System of Units for measuring length?

• Meter• How many centimeter in

a meter?• 100 centimeter in a

meter• How many meters are

there in a kilometer?• 1000 meter in a kilometer

What is the formula for calculating speed?

Which Speed is fastest?

1. 5

2. 300

3. 2

4. 1000

Which Speed is fastest?

1. 5 km

2. 300 cm

3. 2 km

4. 1000 m

Which Speed is fastest?

1. 5 km / hr2. 300 cm / hr3. 2 km / sec4. 1000 m / hr

• 2 km/sec is the fastest• We need both the distance and time unit of

measurement to determine speed

What is average speed?

• The total traveled divided by the total time elapsed.

• The speed of an object along the path traveled can vary

What is difference between velocity and speed?

• Velocity: Speed of the object and direction of motion

• Speed: Just the speed. We don’t know the direction of motion

A car was traveling north at 50 km/hr. It started to travel

northwest at 50 km/hr. Did the speed change? Did the velocity

change? • Speed did not

change• Velocity changed