MOTION Describing Position A reference point is an

MOTION

Describing Position • A reference point is an object you choose to describe the location/position of another object For example: If I wanted to describe the location of the flower pot, what could I use as the reference point?

Describing Position • A position is an object’s distance and direction from a reference point For example: point A is 25 miles NW of point B

Describing Position • You can describe position by using NORTH, SOUTH, EAST, or WEST directions

= 1 mile 1. From the start, go NORTH 4 miles. Where are you now? 2. Go 3 miles EAST. Where are you now? 3. Go 3 miles SOUTH. Where are you now? 4. Go 4 miles WEST. Where are you now? 5. Go 5 miles NORTH. Where are you? 6. Go 3 miles SOUTH then 2 miles WEST. Where are you? 7. Go 3 miles SOUTH. Where are you? 8. Go 4 miles EAST, 2 miles NORTH, then 3 miles WEST. Where are you?

2 points each 18 points 10 points Discussion Questions 10 points each

• Motion – the process of changing position • Motion is based off of a reference point

• Speed – a measure of how fast the object gets from one place to another • Speed can be constant or changing

• Average speed – is the total distance traveled divided by the total time taken to travel that distance

What is the average speed of a student who ran a 200 meter track in 120 seconds?

What is the speed of a train that goes 1, 000 km in 5 hours?

If the average speed of a car is 110 km/h, how long will it take the car to travel 715 km?

If it takes a baseball player 2. 5 seconds to run from the batters box to first base at an average speed of 6. 5 meters per second, what is the distance she covers in that time?

• Velocity – the speed of an object in a particular direction An airplanes velocity is 600 km/h south

Changing Velocity • an object’s velocity changes if either its speed or direction changes

A car travels NW 100 meters in 4 seconds. What is the velocity of the car?

• Acceleration – is the rate at which velocity changes • An object accelerates if its speed, direction, or both change

Positive Acceleration Negative Acceleration

Calculating Average Accerleration • is expressed in m/s 2 V = Vf -t Vi i

A plane passes over point A at a velocity of 240 m/s north. Forty seconds later, it passes over point B at a velocity of 260 m/s north. What is the plane’s average acceleration?

What is the average acceleration of a subway train that speeds up from 9. 6 m/s to 12 m/s in. 8 s on a straight section of track?

A meteoroid changed velocity from 1. 0 km/s to 1. 8 km/s in 0. 03 seconds. What is the acceleration of the meteoroid?

The more details you have, the better off you will be in the future (hint) Front – title + a creative drawing Inside Flap 1 – definition Inside flap 2 – formula Back page – 2 practice problems 1. Describing position map (answer all of the questions) 2. Write 1 positive statement about your classmates work 3. Write 1 (constructive criticism) statement about what your classmate can improve on. Then turn it in to the basket