My parents want me to use more paper and less WordPress when it comes to science. So no more blog posts for science.

# Category Archives: Science 9

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# Grade 9 Science Lesson 11

Today I learned about projectile motion and centripetal acceleration.

- More projectile motion
- Fired straight up, time in flight, comes down with same speed as it went up
- Second, use that time to figure calculate how far the projectile goes.

- Centripetal acceleration
- Race cars
- Satellites

# Grade 9 Science Lesson 10

Today I did a review.

# Grade 9 Science Lesson 9

Today I learned about motion in 2 dimension, and vectors.

- Velocity and acceleration in 2 dimensions
- Vectors
- Tip to tail

- Introduction to projectile motion

As assignments are mostly to be performed on paper I don’t feel the need to mention them here anymore.

# Grade 9 Science Lesson 8

Today I learned about gravity, velocity and acceleration in one dimension.

- Gravity
- Constant 9.81 m/s² at sea level

- Calculating change in velocity for an object under constant acceleration
- Calculating the distance traveled by an accelerating body

My assignments were as follows.

- You drop a rock down a well, after three seconds you hear a splash. How far down is the surface of the water?
- A runner completes a 5km race in 30 minutes, what is the runner’s average speed?
- A sprinter starts from rest, and after 4.0s is running at 12 m/s, what is the sprinter’s average acceleration.
- A car is driving along at 100km/hr how quickly does the car need to decelerate (negative acceleration) to come to rest in 2 seconds. Do you think this is likely? Why or why not?

Oh boy, that’s a lot, so these assignments are hard to write out for you to understand. So I’m going to have to do these on paper.

# Grade 9 Science Lesson 7

Today I learned about acceleration.

- Acceleration
- Average and instantaneous

- Vectors and scalars
- Graphical analysis
- Slopes
- Areas

My assignments were as follows.

- From the Variable acceleration spreadsheet create a spreadsheet and graph that shows velocity with respect to time, and one showing displacement with respect to time.
- Create a spreadsheet and graph showing velocity of a free falling object with respect to time and make another spreadsheet and graph showing distance vs. time. Use a constant acceleration of 9.81 m/s² down.

# Grade 9 Science Lesson 6

Today I learned about position and change with respect to time.

- Position
- Coordinate system

- Change in position with respect to time.
- Velocity
- Average velocity
- Instantaneous velocity
- Speed

- Velocity
- Graphical analysis
- Slopes
- Areas

My recommended activities are as follows.

- Make a spreadsheet that shows the velocity of a falling object as a function of time for 20 seconds. Estimate the distance the object has traveled after 5 seconds, after 15 seconds and after 20 seconds by estimating the area.
- Make a spreadsheet that shows the position of a falling object and estimate the velocity at 5 seconds, 15 seconds, and 30 seconds.

I’ll get it done, so yeah.